diff --git a/Dockerfile b/Dockerfile
index b60982b..0adaf8d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM alpine:3.6
 MAINTAINER b4tman <b4tm4n@mail.ru>
 
-ENV SQUID_VER 4.0.20
+ENV SQUID_VER 4.0.21
 ENV SQUID_SIG_KEY B06884EDB779C89B044E64E3CD6DBF8EF3B17D3E
 ENV SQUID_CONFIG_FILE /etc/squid/squid.conf
 ENV TZ Europe/Moscow