diff --git a/.github/workflows/_checks.yml b/.github/workflows/_checks.yml
index e75b538..2fb9c16 100644
--- a/.github/workflows/_checks.yml
+++ b/.github/workflows/_checks.yml
@@ -55,6 +55,7 @@ jobs:
           - "3.12"
           - "3.13"
           - "3.14"
+          - "3.15"
     steps:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v8.2.0
diff --git a/pyproject.toml b/pyproject.toml
index 45e2ee4..7f6bb5f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,8 +18,10 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
 ]
 dependencies = [
-    # The committed test stubs under tests/protos refuse to import below 1.82.1.
-    "grpcio>=1.82.1,<2",
+    # The committed test stubs under tests/protos refuse to import below 1.82.1, and grpcio ships
+    # no cp315 wheel before 1.84.
+    "grpcio>=1.82.1,<2; python_version < '3.15'",
+    "grpcio>=1.84,<2; python_version >= '3.15'",
     "modern-di>=4.2,<5",
 ]
 version = "0"