diff --git a/Dockerfile b/Dockerfile
index 08c0944..743bb7e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,8 @@ MAINTAINER BIND 9 Developers <bind9-dev@isc.org>
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C.UTF-8
 
-ARG BIND9_VERSION=9.21.4
-ARG BIND9_CHECKSUM=f98efd18c98896c00112fd5cb7e4004d5284be139a5fa9d35f98ed66c5b84a08
+ARG BIND9_VERSION=9.21.5
+ARG BIND9_CHECKSUM=afe46892950a6676fe198b90aa25b7b856cdc468997fac135dc260f313d6455f
 
 RUN apk --no-cache update
 RUN apk --no-cache upgrade