diff --git a/Dockerfile.example b/Dockerfile.example
index 03dd106..b299596 100644
--- a/Dockerfile.example
+++ b/Dockerfile.example
@@ -6,7 +6,7 @@
 FROM ekidd/rust-musl-builder
 
 # Build a static copy of zlib.
-RUN VERS=1.2.8 && \
+RUN VERS=1.2.11 && \
     cd /home/rust/libs && \
     curl -LO http://zlib.net/zlib-$VERS.tar.gz && \
     tar xzf zlib-$VERS.tar.gz && cd zlib-$VERS && \