diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1ae85e2077f..c8c217f62c4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
     uses: ./.github/workflows/test.yml
 
   continuous-release:
+    if: github.repository == 'vuejs/core'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
diff --git a/.github/workflows/size-data.yml b/.github/workflows/size-data.yml
index 3cd6cbfdf95..7f8bf7b08ca 100644
--- a/.github/workflows/size-data.yml
+++ b/.github/workflows/size-data.yml
@@ -18,6 +18,7 @@ env:
 
 jobs:
   upload:
+    if: github.repository == 'vuejs/core'
     runs-on: ubuntu-latest
 
     steps:
diff --git a/.github/workflows/size-report.yml b/.github/workflows/size-report.yml
index 32e96dc64a5..d8d0c416a67 100644
--- a/.github/workflows/size-report.yml
+++ b/.github/workflows/size-report.yml
@@ -18,6 +18,7 @@ jobs:
   size-report:
     runs-on: ubuntu-latest
     if: >
+      github.repository == 'vuejs/core' &&
       github.event.workflow_run.event == 'pull_request' &&
       github.event.workflow_run.conclusion == 'success'
     steps: