diff --git a/.github/ci/build_package.sh b/.github/ci/build_package.sh
index 00906d44..7b0636b5 100755
--- a/.github/ci/build_package.sh
+++ b/.github/ci/build_package.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+export diffexe="diff -U 3"
+apk add zip diffutils
+
 cd src
 l3build ctan
 # This will trigger checkinit_hook() to move the files to the root directory.
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0ccc53d1..d630a243 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -62,13 +62,10 @@ jobs:
     steps: 
       - uses: actions/checkout@v2
         name: checkout code
-      - uses: xu-cheng/texlive-action/full@v1
+      - name: build package with l3build
         with:
           run: |
-            export diffexe="diff -U 3"
-            apk add zip diffutils
-            .github/ci/build_package.sh
-        name: build package with l3build
+            docker run ghcr.io/xu-cheng/texlive-full:20211101 -eo pipefail -c /bin/bash .github/ci/build_package.sh            
       - name: check if generated files are of latest version
         run: |
           git diff --exit-code