diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 956545d..f30362b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -47,7 +47,7 @@ jobs:
 
       - name: Cache zvec
         id: cache-zvec
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
           path: zvec
           key: zvec-v6-${{ steps.version.outputs.zvec_version }}-${{ matrix.platform }}