diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9612e8ecbe..872c859304 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,8 +3,10 @@ name: Build and Test
 on:
   push:
     branches: [main, release/*]
-  pull_request_target:
-    branches: [main]
+  pull_request:
+    branches:
+      - "main"
+      - "release/*"
 
 jobs:
   build:
diff --git a/.github/workflows/flow.yml b/.github/workflows/flow.yml
index 4b452c900d..04698de4d1 100644
--- a/.github/workflows/flow.yml
+++ b/.github/workflows/flow.yml
@@ -1,8 +1,9 @@
 name: Flow build and test
 
 on:
-  pull_request_target:
-    branches: [main]
+  pull_request:
+    branches:
+      - "main"
   push:
     branches: [main]
 
@@ -10,7 +11,7 @@ jobs:
   flow_test:
     strategy:
       matrix:
-        runner: [ubicloud-standard-4]
+        runner: [ubicloud-standard-8]
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 30
     services:
@@ -34,7 +35,7 @@ jobs:
 
       - uses: actions/setup-go@v3
         with:
-          go-version: '>=1.19.0'
+          go-version: ">=1.19.0"
 
       - name: install gotestsum
         run: |
diff --git a/.github/workflows/golang-lint.yml b/.github/workflows/golang-lint.yml
index adf47ca443..fd685d8c44 100644
--- a/.github/workflows/golang-lint.yml
+++ b/.github/workflows/golang-lint.yml
@@ -1,6 +1,9 @@
 name: GolangCI-Lint
 
-on: [pull_request_target]
+on:
+  pull_request:
+    branches:
+      - "main"
 
 jobs:
   golangci-lint:
diff --git a/.github/workflows/rust-lint.yml b/.github/workflows/rust-lint.yml
index 1893386ed8..d87b891957 100644
--- a/.github/workflows/rust-lint.yml
+++ b/.github/workflows/rust-lint.yml
@@ -1,5 +1,10 @@
 name: clippy-action
-on: [pull_request_target]
+
+on:
+  pull_request:
+    branches:
+      - "main"
+
 jobs:
   clippy:
     permissions: