diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 63461fc88..040ba012b 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -8,11 +8,8 @@ name: "CodeQL"
 on:
   push:
     branches: [master]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [master]
   schedule:
-    - cron: '30 10 * * *'
+    - cron: '40 10 * * *'
 
 jobs:
   analyze:
@@ -32,9 +29,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v2
       with:
-        # We must fetch at least the immediate parents so that if this is
-        # a pull request then we can checkout the head.
-        fetch-depth: 2
+        fetch-depth: 0
 
     # If this run was triggered by a pull request event, then checkout
     # the head of the pull request instead of the merge commit.