diff --git a/images_build/server_web/Dockerfile b/images_build/server_web/Dockerfile
index 69e5ab3..7758112 100644
--- a/images_build/server_web/Dockerfile
+++ b/images_build/server_web/Dockerfile
@@ -21,6 +21,7 @@ RUN sed -i s@/archive.ubuntu.com/@/mirrors.tuna.tsinghua.edu.cn/@g /etc/apt/sour
     faketime \
     && gem update --system 3.1.6 \
     && gem install ffi --version 1.15.5 \
+    && gem install public_suffix --version 5.0.5 \
     && gem install jekyll --version 4.2.2
 
 # Install badssl.com