diff --git a/apps/github-runner/github-runner.yaml b/apps/github-runner/github-runner.yaml
index 7cb3629..b360b83 100644
--- a/apps/github-runner/github-runner.yaml
+++ b/apps/github-runner/github-runner.yaml
@@ -4273,8 +4273,11 @@ spec:
             - name: RUN_AS_ROOT
               value: "false"
           resources:
+            # Reduced from 500m → 100m 2026-05-26 because cluster CPU
+            # requests were at 99% across all 3 nodes; idle runners use ~1m.
+            # Burst headroom preserved by limits.cpu: 2000m.
             requests:
-              cpu: "500m"
+              cpu: "100m"
               memory: "1Gi"
             limits:
               cpu: "2000m"
@@ -4408,7 +4411,7 @@ spec:
               value: "false"
           resources:
             requests:
-              cpu: "500m"
+              cpu: "100m"
               memory: "1Gi"
             limits:
               cpu: "2000m"
@@ -4541,7 +4544,7 @@ spec:
               value: "false"
           resources:
             requests:
-              cpu: "500m"
+              cpu: "100m"
               memory: "1Gi"
             limits:
               cpu: "2000m"