diff --git a/Dockerfile b/Dockerfile
index 7eb96032..7d100904 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ ARG MDBOOK_GRAPHVIZ_VERSION=0.1.3
 ARG CARGO_ABOUT_VERSION=0.4.4
 ARG CARGO_AUDIT_VERSION=0.16.0
 ARG CARGO_DENY_VERSION=0.11.0
-ARG ZLIB_VERSION=1.3
+ARG ZLIB_VERSION=1.3.1
 
 RUN apt-get update && \
     export DEBIAN_FRONTEND=noninteractive && \