diff --git a/Dockerfile b/Dockerfile
index 4950734..ce64a08 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ ARG PLEX_VER=1.29.1.6313-f4cdfea9c
 ARG BUSYBOX_VER=1.35.0
 ARG SU_EXEC_VER=0.4
 ARG TINI_VER=0.19.0
-ARG ZLIB_VER=1.2.12
+ARG ZLIB_VER=1.2.13
 ARG LIBXML2_VER=v2.9.10
 ARG LIBXSLT_VER=v1.1.34
 ARG XMLSTAR_VER=1.6.1