diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 24c9670..b870703 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-18.04
 
     steps:
-      - uses: rlespinasse/github-slug-action@master
+      - uses: rlespinasse/github-slug-action@1.1.1
 
       - name: Set up dotnet
         uses: actions/setup-dotnet@v1