diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4174627..2f6a8b8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: haskell/actions/setup@v1.2.6
         with:
           enable-stack: true
@@ -23,7 +23,7 @@ jobs:
   doctest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: haskell/actions/setup@v1.2.6
         with:
           enable-stack: true
@@ -53,7 +53,7 @@ jobs:
           - lts-17.0 # ghc-8.10
 
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: haskell/actions/setup@v1.2.6
         with:
           enable-stack: true