diff --git a/Dockerfile b/Dockerfile
index cfd0b16..b8ade31 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.13.5 as build
 
-ENV SQUID_VER 4.14
+ENV SQUID_VER 4.15
 ENV SQUID_SIG_KEY B06884EDB779C89B044E64E3CD6DBF8EF3B17D3E
 
 RUN set -x && \