diff --git a/.github/workflows/alpine.yml b/.github/workflows/alpine.yml
index febc85b..fcc6a70 100644
--- a/.github/workflows/alpine.yml
+++ b/.github/workflows/alpine.yml
@@ -5,7 +5,7 @@ on: push
 jobs:
   alpine:
     runs-on: ubuntu-24.04
-    container: alpine:latest
+    container: 'alpine:3.21'
     steps:
       # Git is required so that actions/checkout does a proper Git checkout.
       - name: Install Git in container