diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4516c3f..b04b23c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -48,6 +48,8 @@ jobs:
 
   run-alpine-x86:
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/linuxcontainers/alpine:3.18.0@sha256:eb2b13602562cca1424257ab17945d5c7e402764da66a6216d9de385e5f9e3ad
     steps:
       - name: Setup alpine
         uses: jirutka/setup-alpine@v1
@@ -70,7 +72,6 @@ jobs:
             osID=$(grep -e "^ID=" /etc/os-release | cut -c4-)
           [[ $osID == "alpine" ]] && codecov_os="alpine"
           echo "Detected ${codecov_os}"
-        shell: alpine.sh {0}
       - name: Upload coverage to Codecov (script)
         uses: ./
         with:
@@ -107,6 +108,8 @@ jobs:
 
   run-alpine-aarch64:
     runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/linuxcontainers/alpine:3.18.0@sha256:b333a6ba512596007c2683825dd364570303624164926019bbe674d90c28d5fc
     steps:
       - name: Setup alpine
         uses: jirutka/setup-alpine@v1