diff --git a/docker/2.1-alpine/Dockerfile b/docker/2.1-alpine/Dockerfile
index 0a7c9a29..d691fc6d 100644
--- a/docker/2.1-alpine/Dockerfile
+++ b/docker/2.1-alpine/Dockerfile
@@ -4,7 +4,7 @@ LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"
 
 ENV VERSION=2.1.0 \
-    DOWNLOAD_SHA256=zzz \
+    DOWNLOAD_SHA256=ceccf14f43b8ce21312d0dbf247025b8166536e9afba326f8b7c8b1d201fa6d9 \
     GPG_KEYS=A0D6EEA1DCAE49A635A3B2F0779B22DFB3E717B7
 
 RUN set -x && \
diff --git a/docker/2.1-ubuntu/Dockerfile b/docker/2.1-ubuntu/Dockerfile
index 3f629b47..b4dbfed8 100644
--- a/docker/2.1-ubuntu/Dockerfile
+++ b/docker/2.1-ubuntu/Dockerfile
@@ -4,7 +4,7 @@ LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"
 
 ENV VERSION=2.1.0 \
-    DOWNLOAD_SHA256=zzz \
+    DOWNLOAD_SHA256=ceccf14f43b8ce21312d0dbf247025b8166536e9afba326f8b7c8b1d201fa6d9 \
     GPG_KEYS=A0D6EEA1DCAE49A635A3B2F0779B22DFB3E717B7
 
 RUN set -x && \