diff --git a/data/Dockerfiles/dovecot/Dockerfile b/data/Dockerfiles/dovecot/Dockerfile
index fc4501a5f..90a6af938 100644
--- a/data/Dockerfiles/dovecot/Dockerfile
+++ b/data/Dockerfiles/dovecot/Dockerfile
@@ -3,7 +3,7 @@ LABEL maintainer "The Infrastructure Company GmbH <info@servercow.de>"
 
 ARG DEBIAN_FRONTEND=noninteractive
 # renovate: datasource=github-tags depName=dovecot/core versioning=semver-coerced extractVersion=^v(?<version>.*)$
-ARG DOVECOT=2.3.20
+ARG DOVECOT=2.3.21
 # renovate: datasource=github-releases depName=tianon/gosu versioning=semver-coerced extractVersion=^v(?<version>.*)$
 ARG GOSU_VERSION=1.16
 ENV LC_ALL C