diff --git a/Dockerfile b/Dockerfile
index 7dfebad..724807b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.12.0 as build
 
-ENV SQUID_VER 4.12
+ENV SQUID_VER 4.13
 ENV SQUID_SIG_KEY B06884EDB779C89B044E64E3CD6DBF8EF3B17D3E
 
 RUN set -x && \