diff --git a/Dockerfile b/Dockerfile
index 66b74bc..c15a6c9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ WORKDIR /build/
 COPY build.sh /build/
 RUN bash build.sh
 
-FROM ubuntu:jammy@sha256:77906da86b60585ce12215807090eb327e7386c8fafb5402369e421f44eff17e
+FROM ubuntu:jammy@sha256:4f838adc7181d9039ac795a7d0aba05a9bd9ecd480d294483169c5def983b64d
 LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
 
 EXPOSE 25/tcp