diff --git a/.github/workflows/ci-python.yml b/.github/workflows/ci-python.yml
index e2942b809..3f3b99e9c 100644
--- a/.github/workflows/ci-python.yml
+++ b/.github/workflows/ci-python.yml
@@ -23,7 +23,7 @@ env:
 jobs:
   agent-framework-python:
     name: agent-framework-python (${{ matrix.dependency-lane }}, Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -77,7 +77,7 @@ jobs:
 
   openai-sdk-python:
     name: openai-sdk-python (${{ matrix.dependency-lane }}, Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -145,7 +145,7 @@ jobs:
 
   cartesia-sdk-python:
     name: cartesia-sdk-python (${{ matrix.dependency-lane }}, Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -202,7 +202,7 @@ jobs:
 
   pipecat-sdk-python:
     name: pipecat-sdk-python (${{ matrix.dependency-lane }}, Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -259,7 +259,7 @@ jobs:
 
   livekit-sdk-python:
     name: livekit-sdk-python (${{ matrix.dependency-lane }}, Python ${{ matrix.python-version }})
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1a81e979e..a20106e9b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ env:
 jobs:
   quality-checks:
     name: Quality Checks
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && 'peak-ubuntu-24.04-4' || 'ubuntu-latest' }}
     timeout-minutes: 15
     steps:
       - name: Checkout code