diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 46d4033..1416b25 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -34,6 +34,7 @@ jobs:
       matrix:
         k8s-version: ['1.26.15', '1.27.16']
         product-version: ['3.7.1', '3.8.0']
+      max-parallel: 1
     steps:
       - name: Clone the code
         uses: actions/checkout@v4
diff --git a/test/e2e/tls/client-tls-access-pod.txt b/test/e2e/tls/client-tls-access-pod.txt
index b79b729..00874c4 100644
--- a/test/e2e/tls/client-tls-access-pod.txt
+++ b/test/e2e/tls/client-tls-access-pod.txt
@@ -27,7 +27,7 @@ spec:
     resources:
       limits:
         memory: "1.5Gi"
-        cpu: "300m"
+        cpu: "400m"
     volumeMounts:
     - name: client-tls
       mountPath: /kubedoop/client-tls
diff --git a/test/e2e/tls/kafka.yaml b/test/e2e/tls/kafka.yaml
index 88294b8..43ea10e 100644
--- a/test/e2e/tls/kafka.yaml
+++ b/test/e2e/tls/kafka.yaml
@@ -24,7 +24,7 @@ spec:
         config:
           resources:
             cpu:
-              min: 200m
-              max: 400m
+              min: 300m
+              max: 600m
             memory:
               limit: "1Gi"