diff --git a/src/tools/dockerfile-memo/dockerfile.md b/src/tools/dockerfile-memo/dockerfile.md
index 69cf3693c3..b33ac580ee 100644
--- a/src/tools/dockerfile-memo/dockerfile.md
+++ b/src/tools/dockerfile-memo/dockerfile.md
@@ -13,7 +13,7 @@ INSTRUCTION arguments
 Specifies the base image.
 
 ```Dockerfile
-FROM ubuntu:20.04
+FROM ubuntu:26.04@sha256:678c6550cc43645e08669028bc177f50be4e7c5b8cca677067b1914d4afc7a03
 FROM node:22-alpine
 ```
 
diff --git a/src/tools/dockerfile-memo/dockerfile.zh.md b/src/tools/dockerfile-memo/dockerfile.zh.md
index 5da6296a64..e329a7886b 100644
--- a/src/tools/dockerfile-memo/dockerfile.zh.md
+++ b/src/tools/dockerfile-memo/dockerfile.zh.md
@@ -13,7 +13,7 @@ INSTRUCTION arguments
 指定基础镜像。
 
 ```Dockerfile
-FROM ubuntu:20.04
+FROM ubuntu:26.04@sha256:678c6550cc43645e08669028bc177f50be4e7c5b8cca677067b1914d4afc7a03
 FROM node:22-alpine
 ```