diff --git a/Dockerfile b/Dockerfile
index dbc09b9..5def5b6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the zombie-detector binary
-FROM quay.io/cybozu/golang:1.20-jammy as builder
+FROM ghcr.io/cybozu/golang:1.20-jammy as builder
 ARG TARGETOS
 ARG TARGETARCH
 
diff --git a/e2e/manifests/deployment.yaml b/e2e/manifests/deployment.yaml
index 84cad70..b581b84 100644
--- a/e2e/manifests/deployment.yaml
+++ b/e2e/manifests/deployment.yaml
@@ -16,5 +16,5 @@ spec:
     spec:
       containers:
       - name: test
-        image: quay.io/cybozu/ubuntu:22.04
+        image: ghcr.io/cybozu/ubuntu:22.04
         command: ["pause"]
diff --git a/e2e/manifests/observer_pod.yaml b/e2e/manifests/observer_pod.yaml
index 42cf867..fb3ab76 100644
--- a/e2e/manifests/observer_pod.yaml
+++ b/e2e/manifests/observer_pod.yaml
@@ -9,5 +9,5 @@ spec:
     runAsGroup: 10000
   containers:
     - name: test
-      image: quay.io/cybozu/ubuntu:22.04
+      image: ghcr.io/cybozu/ubuntu:22.04
       command: ["pause"]
diff --git a/e2e/manifests/pod.yaml b/e2e/manifests/pod.yaml
index b0a13e3..f3aa017 100644
--- a/e2e/manifests/pod.yaml
+++ b/e2e/manifests/pod.yaml
@@ -11,5 +11,5 @@ spec:
     runAsGroup: 10000
   containers:
     - name: test
-      image: quay.io/cybozu/ubuntu:22.04
+      image: ghcr.io/cybozu/ubuntu:22.04
       command: ["pause"]