diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 70256b3..0ca2ff5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: haskell/actions/setup@v1
+      - uses: haskell/actions/setup@v1.2.1
         with:
           enable-stack: true
       - name: Setup
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: haskell/actions/setup@v1
+      - uses: haskell/actions/setup@v1.2.1
         with:
           enable-stack: true
       - name: Setup
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: haskell/actions/setup@v1
+      - uses: haskell/actions/setup@v1.2.1
         with:
           enable-stack: true
       - name: Setup