diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9286ea2..e6b8b74 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -489,7 +489,7 @@ jobs:
 
   test-musl:
     runs-on: ubuntu-latest
-    container: alpine
+    container: alpine@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b # 3.24.1
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with: