diff --git a/.github/workflows/checksum.yml b/.github/workflows/checksum.yml
index 3f8fe57..9e49404 100644
--- a/.github/workflows/checksum.yml
+++ b/.github/workflows/checksum.yml
@@ -16,7 +16,11 @@ jobs:
           ref: ${{ github.ref }}
 
       - name: Create tarball
-        run: tar -czf source.tar.gz --exclude=.git .
+        run: |
+          tar --exclude=.git \
+              --exclude=node_modules \
+              --exclude=.github \
+              -czf source.tar.gz .
 
       - name: Compute checksum
         run: sha256sum source.tar.gz > checksum.txt