diff --git a/Dockerfile b/Dockerfile
index 78d7263..4eb50c7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,10 @@ ARG PROTOC_VERSION=31.1-r1
 RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
     apk add --update protoc=${PROTOC_VERSION}
 
+ARG ZLIB_STATIC_VERSION=1.3.2-r0
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add --update zlib-static=${ZLIB_STATIC_VERSION}
+
 RUN \
     # This one would be nice if it worked:
     # --mount=type=bind,source=.,target=/root/app \