diff --git a/Dockerfile b/Dockerfile
index 3a88c7a..4eeaa59 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.7 as build
 
-ENV SQUID_VER 4.1
+ENV SQUID_VER 4.2
 ENV SQUID_SIG_KEY B06884EDB779C89B044E64E3CD6DBF8EF3B17D3E
 
 RUN set -x && \