diff --git a/build.properties b/build.properties
index 7dbef35..81761ee 100644
--- a/build.properties
+++ b/build.properties
@@ -1 +1 @@
-version=4.20.0
+version=4.21.2
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 6bdff6e..d4c9409 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -22,7 +22,7 @@
 RUN apk add ca-certificates wget su-exec git
 
 # get gitbucket
-RUN wget https://github.com/gitbucket/gitbucket/releases/download/4.20.0/gitbucket.war -O $GITBUCKET_HOME/latest.war
+RUN wget https://github.com/gitbucket/gitbucket/releases/download/4.21.2/gitbucket.war -O $GITBUCKET_HOME/latest.war
 
 # clean
 RUN apk del wget