diff --git a/.github/workflows/pr_check_macos.yml b/.github/workflows/pr_check_macos.yml
index 6cb2384d..a293a7fd 100644
--- a/.github/workflows/pr_check_macos.yml
+++ b/.github/workflows/pr_check_macos.yml
@@ -54,6 +54,9 @@ jobs:
         working-directory: zstandard_macos
         run: flutter analyze
 
+      - name: Verify version-resolved SwiftPM and Release FFI symbols
+        run: python3 scripts/test_swiftpm_package.py
+
       - name: Run package tests
         working-directory: zstandard_macos
         run: flutter test
diff --git a/.github/workflows/release_workflow.yml b/.github/workflows/release_workflow.yml
index 3aa56924..1d588ac6 100644
--- a/.github/workflows/release_workflow.yml
+++ b/.github/workflows/release_workflow.yml
@@ -669,6 +669,9 @@ jobs:
           else
             flutter config --no-enable-swift-package-manager
           fi
+      - name: Verify version-resolved SwiftPM and Release FFI symbols
+        if: matrix.platform == 'macos' && matrix.dependency_manager == 'swiftpm'
+        run: python3 scripts/test_swiftpm_package.py
       - name: Get dependencies and build Apple example
         env:
           PLATFORM: ${{ matrix.platform }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/Package.swift b/Package.swift
index 881908fb..c4374472 100644
--- a/Package.swift
+++ b/Package.swift
@@ -13,7 +13,7 @@ let package = Package(
     products: [
         .library(
             name: "zstandard-native",
-            targets: ["zstandard_native"]
+            targets: ["zstandard_ffi"]
         ),
     ],
     targets: [
@@ -36,24 +36,14 @@ let package = Package(
                 // internal zstd translation units consume these declarations.
                 .define("ZSTD_STATIC_LINKING_ONLY"),
                 .define("ZSTD_DISABLE_ASM"),
-            ],
-            // Flutter's SwiftPM integration links this target statically into
-            // the application. Keep the FFI entry points in the final image
-            // even when release dead-code stripping is enabled.
-            linkerSettings: [
-                .unsafeFlags([
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_compress",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_decompress",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_compressBound",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_isError",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_getFrameContentSize",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_createDStream",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_initDStream",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_decompressStream",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_freeDStream",
-                    "-Xlinker", "-u", "-Xlinker", "_ZSTD_DStreamOutSize",
-                ])
             ]
         ),
+        // Keep the Dart-only entry points without unsafe dependency flags.
+        .target(
+            name: "zstandard_ffi",
+            dependencies: ["zstandard_native"],
+            path: "zstandard_native/src/swiftpm",
+            publicHeadersPath: "include"
+        ),
     ]
 )
diff --git a/docs/architecture/ffi-implementation.md b/docs/architecture/ffi-implementation.md
index 601d5fba..83799b87 100644
--- a/docs/architecture/ffi-implementation.md
+++ b/docs/architecture/ffi-implementation.md
@@ -41,8 +41,9 @@ application. Repository checkouts may use the adjacent package; published
 consumers resolve it through Dart's package configuration. Build scripts never
 select an arbitrary matching Pub-cache directory.
 
-SwiftPM force-loads the complete FFI symbol surface because its static linker
-could otherwise remove Dart-only entry points. CocoaPods builds the equivalent
+SwiftPM plugin registration links a C shim with a retained table of the ten
+FFI entry points, preventing its static linker from removing Dart-only symbols
+without using unsafe package flags. CocoaPods builds the equivalent
 C set in an embedded framework. CLI tests open every required symbol; runtime
 roundtrips exercise the same codec.
 
diff --git a/docs/development/apple-dependencies.md b/docs/development/apple-dependencies.md
index ab24b4c5..36177b09 100644
--- a/docs/development/apple-dependencies.md
+++ b/docs/development/apple-dependencies.md
@@ -32,7 +32,7 @@ The iOS and macOS manifests depend on the repository-level SwiftPM facade:
 ```swift
 .package(
     url: "https://github.com/vypdev/zstandard.git",
-    exact: "1.5.0"
+    exact: "1.5.5"
 )
 ```
 
@@ -42,7 +42,12 @@ mutable branches are never used in a published manifest.
 
 The SwiftPM target deliberately excludes unsupported or unnecessary upstream
 directories and disables assembly for the Apple build. It also preserves the
-FFI entry points when release dead-code stripping is enabled. The public
+FFI entry points when release dead-code stripping is enabled. The product
+includes a project-owned C shim in `zstandard_native/src/swiftpm/`. SwiftPM
+plugin registration calls `ZstandardNativeRetainSymbols`, pulling in a
+`used` table of the ten Dart FFI entry points. This keeps version-based
+resolution compatible with SwiftPM without `unsafeFlags`; the upstream C
+sources and CocoaPods implementation remain unchanged. The public
 headers in `zstandard_native/src/zstd/include/` are thin forwarding headers;
 the actual headers and all C implementation files remain in the canonical
 directory.
@@ -54,6 +59,13 @@ native integration tests, not only by manifest parsing.
 
 ## Verification policy
 
+Run `python3 scripts/test_swiftpm_package.py` on macOS for the standalone
+regression. It creates an isolated local Git dependency with a semantic version
+tag, builds a consumer in Release with dead stripping, resolves every required
+symbol using `dlsym`, and exercises one-shot and streaming roundtrips. A local
+path or revision dependency alone would not detect the unsafe-flags regression.
+
+
 Every Apple change must be tested through both dependency managers on the
 ARM64 self-hosted macOS runner:
 
diff --git a/scripts/test_swiftpm_package.py b/scripts/test_swiftpm_package.py
new file mode 100644
index 00000000..f60ca0a2
--- /dev/null
+++ b/scripts/test_swiftpm_package.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python3
+"""Build a version-resolved SwiftPM consumer and check Release FFI symbols.
+
+The dependency is an isolated, locally tagged copy of the candidate source.
+A path or revision dependency would bypass SwiftPM's unsafe-flags check.
+"""
+from pathlib import Path
+import platform
+import shutil
+import subprocess
+import tempfile
+
+ROOT = Path(__file__).resolve().parents[1]
+
+PROBE = r'''#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <zstd.h>
+#include <zstandard_ffi.h>
+
+#define REQUIRE(condition) do { \
+    if (!(condition)) { \
+        fprintf(stderr, "Failed: %s\n", #condition); \
+        return 1; \
+    } \
+} while (0)
+
+#define LOAD(name) \
+    __typeof__(&name) name##Fn = (__typeof__(&name))dlsym(RTLD_DEFAULT, #name); \
+    REQUIRE(name##Fn != NULL)
+
+int main(void) {
+    ZstandardNativeRetainSymbols();
+    LOAD(ZSTD_compress);
+    LOAD(ZSTD_decompress);
+    LOAD(ZSTD_compressBound);
+    LOAD(ZSTD_isError);
+    LOAD(ZSTD_getFrameContentSize);
+    LOAD(ZSTD_createDStream);
+    LOAD(ZSTD_initDStream);
+    LOAD(ZSTD_decompressStream);
+    LOAD(ZSTD_freeDStream);
+    LOAD(ZSTD_DStreamOutSize);
+
+    const char input[] = "Version-resolved SwiftPM FFI roundtrip";
+    char compressed[256];
+    char output[256];
+    REQUIRE(ZSTD_compressBoundFn(sizeof(input)) <= sizeof(compressed));
+    size_t size = ZSTD_compressFn(compressed, sizeof(compressed), input, sizeof(input), 3);
+    REQUIRE(!ZSTD_isErrorFn(size));
+    REQUIRE(ZSTD_getFrameContentSizeFn(compressed, size) == sizeof(input));
+    REQUIRE(ZSTD_decompressFn(output, sizeof(output), compressed, size) == sizeof(input));
+    REQUIRE(memcmp(input, output, sizeof(input)) == 0);
+
+    ZSTD_DStream *stream = ZSTD_createDStreamFn();
+    REQUIRE(stream != NULL);
+    REQUIRE(!ZSTD_isErrorFn(ZSTD_initDStreamFn(stream)));
+    REQUIRE(ZSTD_DStreamOutSizeFn() > 0);
+    ZSTD_inBuffer source = { compressed, size, 0 };
+    ZSTD_outBuffer destination = { output, sizeof(output), 0 };
+    REQUIRE(ZSTD_decompressStreamFn(stream, &destination, &source) == 0);
+    REQUIRE(source.pos == size && destination.pos == sizeof(input));
+    REQUIRE(memcmp(input, output, sizeof(input)) == 0);
+    REQUIRE(!ZSTD_isErrorFn(ZSTD_freeDStreamFn(stream)));
+    puts("All 10 FFI symbols survive Release dead stripping; one-shot and streaming roundtrips pass.");
+    return 0;
+}
+'''
+
+
+def run(*command, cwd):
+    subprocess.run(command, cwd=cwd, check=True, timeout=300)
+
+
+def main():
+    if platform.system() != 'Darwin':
+        raise SystemExit('This Apple linker regression test requires macOS and Swift.')
+    with tempfile.TemporaryDirectory(prefix='zstandard-swiftpm-') as folder:
+        root = Path(folder)
+        dependency = root / 'zstandard'
+        dependency.mkdir()
+        shutil.copyfile(ROOT / 'Package.swift', dependency / 'Package.swift')
+        shutil.copytree(ROOT / 'zstandard_native/src', dependency / 'zstandard_native/src')
+        run('git', 'init', '-q', cwd=dependency)
+        run('git', 'add', '.', cwd=dependency)
+        run('git', '-c', 'user.name=SwiftPM regression', '-c',
+            'user.email=swiftpm-test@example.invalid', 'commit', '-qm', 'Candidate fixture', cwd=dependency)
+        run('git', 'tag', '1.0.0', cwd=dependency)
+
+        consumer = root / 'consumer'
+        (consumer / 'Sources/Probe').mkdir(parents=True)
+        (consumer / 'Sources/Probe/main.c').write_text(PROBE)
+        (consumer / 'Package.swift').write_text('''// swift-tools-version: 5.9
+import PackageDescription
+let package = Package(
+    name: "Probe",
+    platforms: [.macOS(.v10_15)],
+    dependencies: [.package(url: "''' + dependency.as_uri() + '''", exact: "1.0.0")],
+    targets: [.executableTarget(name: "Probe", dependencies: [
+        .product(name: "zstandard-native", package: "zstandard")
+    ])]
+)
+''')
+        build = root / 'build'
+        run('swift', 'build', '--configuration', 'release', '--scratch-path', str(build),
+            '--cache-path', str(root / 'cache'), '-Xlinker', '-dead_strip', cwd=consumer)
+        run(str(build / 'release/Probe'), cwd=consumer)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/zstandard/CHANGELOG.md b/zstandard/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard/CHANGELOG.md
+++ b/zstandard/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard/pubspec.yaml b/zstandard/pubspec.yaml
index 586cc302..93a92660 100644
--- a/zstandard/pubspec.yaml
+++ b/zstandard/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard
 description: "Flutter plugin for fast Zstandard compression and decompression across native and WebAssembly platforms."
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard
@@ -28,13 +28,13 @@ flutter:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_android: ^1.5.5
-  zstandard_ios: ^1.5.5
-  zstandard_linux: ^1.5.5
-  zstandard_macos: ^1.5.5
-  zstandard_platform_interface: ^1.5.5
-  zstandard_web: ^1.5.5
-  zstandard_windows: ^1.5.5
+  zstandard_android: ^1.5.6
+  zstandard_ios: ^1.5.6
+  zstandard_linux: ^1.5.6
+  zstandard_macos: ^1.5.6
+  zstandard_platform_interface: ^1.5.6
+  zstandard_web: ^1.5.6
+  zstandard_windows: ^1.5.6
 
 dev_dependencies:
   flutter_lints: ^6.0.0
diff --git a/zstandard_android/CHANGELOG.md b/zstandard_android/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_android/CHANGELOG.md
+++ b/zstandard_android/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_android/pubspec.yaml b/zstandard_android/pubspec.yaml
index bb849d47..5263695b 100644
--- a/zstandard_android/pubspec.yaml
+++ b/zstandard_android/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_android
 description: Android implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_android
@@ -12,8 +12,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
-  zstandard_native: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
+  zstandard_native: ^1.5.6
   ffi: ^2.2.0
 
 dev_dependencies:
diff --git a/zstandard_cli/CHANGELOG.md b/zstandard_cli/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_cli/CHANGELOG.md
+++ b/zstandard_cli/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_cli/lib/src/bin/libzstandard_macos.dylib b/zstandard_cli/lib/src/bin/libzstandard_macos.dylib
index 6cfb1e6c..05a07bb7 100755
Binary files a/zstandard_cli/lib/src/bin/libzstandard_macos.dylib and b/zstandard_cli/lib/src/bin/libzstandard_macos.dylib differ
diff --git a/zstandard_cli/lib/src/bin/zstandard_windows_arm64.dll b/zstandard_cli/lib/src/bin/zstandard_windows_arm64.dll
index b8403a64..1cd72c27 100644
Binary files a/zstandard_cli/lib/src/bin/zstandard_windows_arm64.dll and b/zstandard_cli/lib/src/bin/zstandard_windows_arm64.dll differ
diff --git a/zstandard_cli/lib/src/bin/zstandard_windows_x64.dll b/zstandard_cli/lib/src/bin/zstandard_windows_x64.dll
index a6d9a1f3..ec867f7b 100644
Binary files a/zstandard_cli/lib/src/bin/zstandard_windows_x64.dll and b/zstandard_cli/lib/src/bin/zstandard_windows_x64.dll differ
diff --git a/zstandard_cli/lib/src/cli_runner.dart b/zstandard_cli/lib/src/cli_runner.dart
index 9a27036f..86936680 100644
--- a/zstandard_cli/lib/src/cli_runner.dart
+++ b/zstandard_cli/lib/src/cli_runner.dart
@@ -8,7 +8,7 @@ import 'utils/constants.dart';
 import 'zstandard_cli_base.dart';
 
 /// Version of the command-line interface.
-const String zstandardCliVersion = '1.5.5';
+const String zstandardCliVersion = '1.5.6';
 
 /// Runs the compression command and returns a process exit code.
 Future<int> runCompressCommand(
diff --git a/zstandard_cli/pubspec.yaml b/zstandard_cli/pubspec.yaml
index 3b03aefc..1fc86b71 100644
--- a/zstandard_cli/pubspec.yaml
+++ b/zstandard_cli/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_cli
 description: Command-line interface for compressing and decompressing files with Zstandard.
-version: 1.5.5
+version: 1.5.6
 
 executables:
   zstandard-compress: compress
@@ -16,7 +16,7 @@ dependencies:
   ffi: ^2.2.0
   path: ^1.9.1
   platform: ^3.1.6
-  zstandard_native: ^1.5.5
+  zstandard_native: ^1.5.6
 
 dev_dependencies:
   coverage: ^1.15.0
diff --git a/zstandard_ios/CHANGELOG.md b/zstandard_ios/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_ios/CHANGELOG.md
+++ b/zstandard_ios/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_ios/ios/zstandard_ios.podspec b/zstandard_ios/ios/zstandard_ios.podspec
index 60aaad28..419a9af9 100644
--- a/zstandard_ios/ios/zstandard_ios.podspec
+++ b/zstandard_ios/ios/zstandard_ios.podspec
@@ -5,7 +5,7 @@
 Pod::Spec.new do |s|
   s.cocoapods_version = '>= 1.11.0'  # for script_phase :before_headers
   s.name             = 'zstandard_ios'
-  s.version          = '1.5.5'
+  s.version          = '1.5.6'
   s.summary          = 'iOS implementation of the Zstandard Flutter plugin.'
   s.description      = <<-DESC
 Native Zstandard compression and bounded decompression for Flutter on iOS.
diff --git a/zstandard_ios/ios/zstandard_ios/Package.swift b/zstandard_ios/ios/zstandard_ios/Package.swift
index c36ae80c..b7b63587 100644
--- a/zstandard_ios/ios/zstandard_ios/Package.swift
+++ b/zstandard_ios/ios/zstandard_ios/Package.swift
@@ -10,7 +10,7 @@ let nativePackageDependency: Package.Dependency = {
     // Match the immutable repository tag carrying this plugin release.
     return .package(
         url: "https://github.com/vypdev/zstandard.git",
-        exact: "1.5.5"
+        exact: "1.5.6"
     )
 }()
 
diff --git a/zstandard_ios/ios/zstandard_ios/Sources/zstandard_ios/ZstandardIosPlugin.swift b/zstandard_ios/ios/zstandard_ios/Sources/zstandard_ios/ZstandardIosPlugin.swift
index 2fa7cccc..8b62bbbb 100644
--- a/zstandard_ios/ios/zstandard_ios/Sources/zstandard_ios/ZstandardIosPlugin.swift
+++ b/zstandard_ios/ios/zstandard_ios/Sources/zstandard_ios/ZstandardIosPlugin.swift
@@ -1,8 +1,14 @@
 import Flutter
 import UIKit
+#if SWIFT_PACKAGE
+import zstandard_ffi
+#endif
 
 public class ZstandardIosPlugin: NSObject, FlutterPlugin {
   public static func register(with registrar: FlutterPluginRegistrar) {
+    #if SWIFT_PACKAGE
+    ZstandardNativeRetainSymbols()
+    #endif
     let channel = FlutterMethodChannel(name: "plugins.flutter.io/zstandard", binaryMessenger: registrar.messenger())
     let instance = ZstandardIosPlugin()
     registrar.addMethodCallDelegate(instance, channel: channel)
diff --git a/zstandard_ios/pubspec.yaml b/zstandard_ios/pubspec.yaml
index d0499d36..4c357423 100644
--- a/zstandard_ios/pubspec.yaml
+++ b/zstandard_ios/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_ios
 description: iOS implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_ios
@@ -12,8 +12,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
-  zstandard_native: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
+  zstandard_native: ^1.5.6
   ffi: ^2.2.0
 
 dev_dependencies:
diff --git a/zstandard_ios/test/spm_package_test.dart b/zstandard_ios/test/spm_package_test.dart
index f76bdf25..34f2004b 100644
--- a/zstandard_ios/test/spm_package_test.dart
+++ b/zstandard_ios/test/spm_package_test.dart
@@ -27,18 +27,8 @@ void main() {
     if (rootManifest.existsSync()) {
       final rootContents = rootManifest.readAsStringSync();
       expect(rootContents, contains('path: "zstandard_native/src/zstd"'));
-      for (final symbol in [
-        '_ZSTD_compress',
-        '_ZSTD_decompress',
-        '_ZSTD_isError',
-        '_ZSTD_createDStream',
-        '_ZSTD_initDStream',
-        '_ZSTD_decompressStream',
-        '_ZSTD_freeDStream',
-        '_ZSTD_DStreamOutSize',
-      ]) {
-        expect(rootContents, contains(symbol));
-      }
+      expect(rootContents, isNot(contains('unsafeFlags')));
+      expect(rootContents, contains('targets: ["zstandard_ffi"]'));
     }
   });
 }
diff --git a/zstandard_linux/CHANGELOG.md b/zstandard_linux/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_linux/CHANGELOG.md
+++ b/zstandard_linux/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_linux/pubspec.yaml b/zstandard_linux/pubspec.yaml
index 48f437d7..e5bb7434 100644
--- a/zstandard_linux/pubspec.yaml
+++ b/zstandard_linux/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_linux
 description: Linux implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_linux
@@ -12,8 +12,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
-  zstandard_native: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
+  zstandard_native: ^1.5.6
   ffi: ^2.2.0
 
 dev_dependencies:
diff --git a/zstandard_macos/CHANGELOG.md b/zstandard_macos/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_macos/CHANGELOG.md
+++ b/zstandard_macos/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_macos/macos/zstandard_macos.podspec b/zstandard_macos/macos/zstandard_macos.podspec
index 59d78ab4..459bf664 100644
--- a/zstandard_macos/macos/zstandard_macos.podspec
+++ b/zstandard_macos/macos/zstandard_macos.podspec
@@ -5,7 +5,7 @@
 Pod::Spec.new do |s|
   s.cocoapods_version = '>= 1.11.0'  # for script_phase :before_headers
   s.name             = 'zstandard_macos'
-  s.version          = '1.5.5'
+  s.version          = '1.5.6'
   s.summary          = 'macOS implementation of the Zstandard Flutter plugin.'
   s.description      = <<-DESC
 Native Zstandard compression and bounded decompression for Flutter on macOS.
diff --git a/zstandard_macos/macos/zstandard_macos/Package.swift b/zstandard_macos/macos/zstandard_macos/Package.swift
index 115e45da..acb05e95 100644
--- a/zstandard_macos/macos/zstandard_macos/Package.swift
+++ b/zstandard_macos/macos/zstandard_macos/Package.swift
@@ -10,7 +10,7 @@ let nativePackageDependency: Package.Dependency = {
     // Match the immutable repository tag carrying this plugin release.
     return .package(
         url: "https://github.com/vypdev/zstandard.git",
-        exact: "1.5.5"
+        exact: "1.5.6"
     )
 }()
 
diff --git a/zstandard_macos/macos/zstandard_macos/Sources/zstandard_macos/ZstandardMacosPlugin.swift b/zstandard_macos/macos/zstandard_macos/Sources/zstandard_macos/ZstandardMacosPlugin.swift
index 678c538a..adc71ed8 100644
--- a/zstandard_macos/macos/zstandard_macos/Sources/zstandard_macos/ZstandardMacosPlugin.swift
+++ b/zstandard_macos/macos/zstandard_macos/Sources/zstandard_macos/ZstandardMacosPlugin.swift
@@ -1,8 +1,14 @@
 import Cocoa
 import FlutterMacOS
+#if SWIFT_PACKAGE
+import zstandard_ffi
+#endif
 
 public class ZstandardMacosPlugin: NSObject, FlutterPlugin {
   public static func register(with registrar: FlutterPluginRegistrar) {
+    #if SWIFT_PACKAGE
+    ZstandardNativeRetainSymbols()
+    #endif
     let channel = FlutterMethodChannel(name: "plugins.flutter.io/zstandard", binaryMessenger: registrar.messenger)
     let instance = ZstandardMacosPlugin()
     registrar.addMethodCallDelegate(instance, channel: channel)
diff --git a/zstandard_macos/pubspec.yaml b/zstandard_macos/pubspec.yaml
index 22a37b82..521a000b 100644
--- a/zstandard_macos/pubspec.yaml
+++ b/zstandard_macos/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_macos
 description: macOS implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_macos
@@ -12,8 +12,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
-  zstandard_native: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
+  zstandard_native: ^1.5.6
   ffi: ^2.2.0
 
 dev_dependencies:
diff --git a/zstandard_macos/test/spm_package_test.dart b/zstandard_macos/test/spm_package_test.dart
index e7995772..1525d57c 100644
--- a/zstandard_macos/test/spm_package_test.dart
+++ b/zstandard_macos/test/spm_package_test.dart
@@ -28,18 +28,8 @@ void main() {
     if (rootManifest.existsSync()) {
       final rootContents = rootManifest.readAsStringSync();
       expect(rootContents, contains('path: "zstandard_native/src/zstd"'));
-      for (final symbol in [
-        '_ZSTD_compress',
-        '_ZSTD_decompress',
-        '_ZSTD_isError',
-        '_ZSTD_createDStream',
-        '_ZSTD_initDStream',
-        '_ZSTD_decompressStream',
-        '_ZSTD_freeDStream',
-        '_ZSTD_DStreamOutSize',
-      ]) {
-        expect(rootContents, contains(symbol));
-      }
+      expect(rootContents, isNot(contains('unsafeFlags')));
+      expect(rootContents, contains('targets: ["zstandard_ffi"]'));
     }
   });
 }
diff --git a/zstandard_native/CHANGELOG.md b/zstandard_native/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_native/CHANGELOG.md
+++ b/zstandard_native/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_native/pubspec.yaml b/zstandard_native/pubspec.yaml
index 20002e87..e972cba1 100644
--- a/zstandard_native/pubspec.yaml
+++ b/zstandard_native/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_native
 description: Native zstd C sources and FFI bindings for the zstandard Flutter plugin.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_native
diff --git a/zstandard_native/src/swiftpm/include/zstandard_ffi.h b/zstandard_native/src/swiftpm/include/zstandard_ffi.h
new file mode 100644
index 00000000..14daeef5
--- /dev/null
+++ b/zstandard_native/src/swiftpm/include/zstandard_ffi.h
@@ -0,0 +1,15 @@
+#ifndef ZSTANDARD_FFI_H
+#define ZSTANDARD_FFI_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Call during SwiftPM plugin registration to link the Dart FFI entry points.
+void ZstandardNativeRetainSymbols(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/zstandard_native/src/swiftpm/zstandard_ffi.c b/zstandard_native/src/swiftpm/zstandard_ffi.c
new file mode 100644
index 00000000..82859644
--- /dev/null
+++ b/zstandard_native/src/swiftpm/zstandard_ffi.c
@@ -0,0 +1,23 @@
+#include "zstandard_ffi.h"
+#include <zstd.h>
+
+// Mach-O's used attribute protects this table and its references from Release
+// dead stripping. Registration pulls this object into the statically linked app.
+// Keep this project-owned shim outside the vendored upstream zstd source tree.
+__attribute__((used))
+static void (*const zstandard_ffi_symbols[])(void) = {
+    (void (*)(void))ZSTD_compress,
+    (void (*)(void))ZSTD_decompress,
+    (void (*)(void))ZSTD_compressBound,
+    (void (*)(void))ZSTD_isError,
+    (void (*)(void))ZSTD_getFrameContentSize,
+    (void (*)(void))ZSTD_createDStream,
+    (void (*)(void))ZSTD_initDStream,
+    (void (*)(void))ZSTD_decompressStream,
+    (void (*)(void))ZSTD_freeDStream,
+    (void (*)(void))ZSTD_DStreamOutSize,
+};
+
+void ZstandardNativeRetainSymbols(void) {
+    // Linking this object retains the used symbol table; no zstd call is needed.
+}
diff --git a/zstandard_platform_interface/CHANGELOG.md b/zstandard_platform_interface/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_platform_interface/CHANGELOG.md
+++ b/zstandard_platform_interface/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_platform_interface/pubspec.yaml b/zstandard_platform_interface/pubspec.yaml
index e9811910..f9a89367 100644
--- a/zstandard_platform_interface/pubspec.yaml
+++ b/zstandard_platform_interface/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_platform_interface
 description: A common platform interface for the zstandard plugin.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_platform_interface
diff --git a/zstandard_web/CHANGELOG.md b/zstandard_web/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_web/CHANGELOG.md
+++ b/zstandard_web/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_web/pubspec.yaml b/zstandard_web/pubspec.yaml
index db3446af..5821307c 100644
--- a/zstandard_web/pubspec.yaml
+++ b/zstandard_web/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_web
 description: Web implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_web
@@ -22,7 +22,7 @@ dependencies:
     sdk: flutter
   flutter_web_plugins:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
   web: ^1.1.1
 
 dev_dependencies:
diff --git a/zstandard_windows/CHANGELOG.md b/zstandard_windows/CHANGELOG.md
index 0ab96875..03d9a140 100644
--- a/zstandard_windows/CHANGELOG.md
+++ b/zstandard_windows/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 1.5.6 - Release patch fix versioned SwiftPM resolution 188
+
+- Fix SwiftPM resolution of the native package through immutable exact-version dependencies by removing unsafe linker flags (issue #188, PR #189).
+- Preserve all ten Dart FFI entry points in iOS/macOS SwiftPM Release builds through plugin registration and a retained native symbol table.
+- Add a version-resolved SwiftPM Release regression with dynamic symbol lookup and one-shot/streaming roundtrips to PR and release validation.
+- Minimum supported SDKs remain Dart `^3.12.0` and Flutter `>=3.44.0` (published 1.5.0 used Dart `^3.6.0` and Flutter `>=3.3.0`). CI uses Flutter 3.47.2.
+
 ## 1.5.5 - Release fix Android native sources from the Windows Pub cache
 
 - Fix Android native-source discovery for consumers using the Windows Pub cache, including paths with spaces, Unicode and correctly resolved package-config URIs.
diff --git a/zstandard_windows/pubspec.yaml b/zstandard_windows/pubspec.yaml
index 80c9f242..07fd6699 100644
--- a/zstandard_windows/pubspec.yaml
+++ b/zstandard_windows/pubspec.yaml
@@ -1,6 +1,6 @@
 name: zstandard_windows
 description: Windows implementation of the Zstandard compression plugin for Flutter applications.
-version: 1.5.5
+version: 1.5.6
 
 homepage: https://vyp.dev
 repository: https://github.com/vypdev/zstandard/tree/master/zstandard_windows
@@ -12,8 +12,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  zstandard_platform_interface: ^1.5.5
-  zstandard_native: ^1.5.5
+  zstandard_platform_interface: ^1.5.6
+  zstandard_native: ^1.5.6
   ffi: ^2.2.0
 
 dev_dependencies: