diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c238687..2fdbacb2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -261,7 +261,7 @@ jobs:
       # normal PR path already covers model negotiation and framing in Rust.
       - name: Cache the source-pinned canonical MCK build
         if: inputs.qualify-mep || github.event_name == 'workflow_dispatch'
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .dev/mep-tool/
           key: mep-${{ runner.os }}-${{ runner.arch }}-rust-1.98.1-${{ hashFiles('rust/extension.toml', 'scripts/mep_tool.py') }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ff0263d3..2c3f3723 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -33,7 +33,7 @@ jobs:
       - uses: jdx/mise-action@v5
         with:
           install_args: rust python
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: |
             .dev/mep-tool/
@@ -282,7 +282,7 @@ jobs:
           !matrix.reuse &&
           (github.event_name == 'workflow_dispatch' ||
            startsWith(github.ref, 'refs/tags/extension/python/v'))
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             .dev/mep-tool/