diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 18cfb379..cc56d27a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,7 +35,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - id: set-matrix
         run: echo "matrix=$(jq -c . < ./.github/workflows/matrix.json)" >> $GITHUB_OUTPUT
@@ -52,7 +52,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -70,7 +70,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -97,7 +97,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -117,7 +117,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -133,7 +133,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -149,7 +149,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -165,7 +165,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with:
@@ -181,7 +181,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha || github.ref }}
+          ref: ${{ github.sha || github.ref }}
 
       - uses: ./.github/actions/setup
         with: