diff --git a/.github/workflows/protobuf_conformance.yaml b/.github/workflows/protobuf_conformance.yaml
index 6545a131..d6a29b5d 100644
--- a/.github/workflows/protobuf_conformance.yaml
+++ b/.github/workflows/protobuf_conformance.yaml
@@ -16,7 +16,7 @@ env:
 
 jobs:
   conformance:
-    runs-on: ubuntu-latest
+    runs-on: [ubuntu-22.04-github-hosted-16core]
     steps:
       - uses: actions/checkout@v3
         with:
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 215a84c0..30b552c1 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -20,7 +20,7 @@ env:
 jobs:
   check-build-test:
 
-    runs-on: ubuntu-latest
+    runs-on: [ubuntu-22.04-github-hosted-16core]
 
     defaults:
       run: