diff --git a/.woodpecker.yml b/.woodpecker.yml
index 7f27898..135b37c 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -1,5 +1,6 @@
 when:
   branch: master
+  evaluate: 'not (CI_COMMIT_MESSAGE contains "Update sha256sum")'
 
 steps:
   build:
@@ -10,7 +11,7 @@ steps:
       - git remote set-url origin "https://$${CBTOKEN}@git.slc.ar/slococo/calsais.git"
       - git config --local user.name "$(git log --format=%an | head -n 1)"
       - git config --local user.email "$(git log --format=%ae | head -n 1)"
-      - sed -i "s/^[A-Za-z0-9]\{64\}/$(sha256sum install.sh)/" README.md
+      - sed -i "s/^[A-Za-z0-9]\{64\}/$(sha256sum install.sh | cut -d' ' -f1)/" README.md
       - if [ -z "$(git status --porcelain)" ]; then exit 0; fi
       - git add README.md
       - git commit -m "Update sha256sum"