diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aea87d4..8b959ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: haskell-actions/setup@v2
+      - uses: haskell-actions/setup@f9150cb1d140e9a9271700670baa38991e6fa25c # v2.10.3
         with:
           ghc-version: 8.10.7
           enable-stack: true