diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 909737e6..03c3c683 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3.1.0
 
     - name: Set up Python 3.8
       uses: actions/setup-python@v2
@@ -47,7 +47,7 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3.1.0
 
     - uses: conda-incubator/setup-miniconda@v2
       with: