diff --git a/Dockerfile b/Dockerfile
index 66b74bc..c76d0c2 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@sha256:3ba65aa20f86a0fad9df2b2c259c613df006b2e6d0bfcc8a146afb8c525a9751
 LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
 
 EXPOSE 25/tcp