diff --git a/.github/workflows/fuzz.yml b/.github/workflows/fuzz.yml
index b3b74b9..6972acd 100644
--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -44,7 +44,7 @@ jobs:
       # today's as a new entry, so Hypothesis's example database grows
       # night over night instead of starting cold every time.
       - name: Restore accumulated Hypothesis examples
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: .hypothesis
           key: hypothesis-nightly-${{ github.run_id }}
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index 32a09f9..591f3ee 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -37,7 +37,7 @@ jobs:
       # restore-key for the same reason: a fixed key would restore
       # forever but never save a new entry.
       - name: Restore accumulated mutmut cache
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: |
             .mutmut-cache