diff --git a/.github/workflows/pr-check-build-size.yml b/.github/workflows/pr-check-build-size.yml
index 255a96626..d5bcef121 100644
--- a/.github/workflows/pr-check-build-size.yml
+++ b/.github/workflows/pr-check-build-size.yml
@@ -20,7 +20,7 @@ jobs:
     steps:
     - name: build-size-check
       id: get_sizes
-      uses: TiddlyWiki/cerebrus@v5
+      uses: TiddlyWiki/cerebrus@v6
       with:
         pr_number: ${{ github.event.pull_request.number }}
         repo: ${{ github.repository }}
diff --git a/.github/workflows/pr-comment-build-size.yml b/.github/workflows/pr-comment-build-size.yml
index 96b4e391f..72119c6af 100644
--- a/.github/workflows/pr-comment-build-size.yml
+++ b/.github/workflows/pr-comment-build-size.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Build and check size
-      uses: TiddlyWiki/cerebrus@v5
+      uses: TiddlyWiki/cerebrus@v6
       with:
         pr_number: ${{ inputs.pr_number }}
         repo: ${{ github.repository }}
diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
index 1cc858652..84df47858 100644
--- a/.github/workflows/pr-validation.yml
+++ b/.github/workflows/pr-validation.yml
@@ -15,22 +15,22 @@ jobs:
     steps:
     # Step 1: Validate PR paths
     - name: Validate PR Paths
-      uses: TiddlyWiki/cerebrus@v5
+      uses: TiddlyWiki/cerebrus@v6
       with:
         pr_number: ${{ github.event.pull_request.number }}
         repo: ${{ github.repository }}
-        base_ref: ${{ github.base_ref }}
+        base_ref: ${{ github.event.pull_request.base.ref }}
         github_token: ${{ secrets.GITHUB_TOKEN }}
         mode: rules
       continue-on-error: true
     
     # Step 2: Validate change notes
     - name: Validate Change Notes
-      uses: TiddlyWiki/cerebrus@v5
+      uses: TiddlyWiki/cerebrus@v6
       with:
         pr_number: ${{ github.event.pull_request.number }}
         repo: ${{ github.repository }}
-        base_ref: ${{ github.base_ref }}
+        base_ref: ${{ github.event.pull_request.base.ref }}
         github_token: ${{ secrets.GITHUB_TOKEN }}
         mode: changenotes
       continue-on-error: false