diff --git a/src/core/zlib/Dockerfile b/src/core/zlib/Dockerfile
index 81e656d..2ac355f 100644
--- a/src/core/zlib/Dockerfile
+++ b/src/core/zlib/Dockerfile
@@ -7,8 +7,8 @@ FROM ${REGISTRY}/busybox:latest as busybox
 
 FROM busybox as base
 ENV SRC_SITE=https://www.zlib.net/
-ENV SRC_VERSION=1.3
-ENV SRC_HASH=ff0ba4c292013dbc27530b3a81e1f9a813cd39de01ca5e0f8bf355702efa593e
+ENV SRC_VERSION=1.3.1
+ENV SRC_HASH=9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23
 COPY --from=gcc . /
 COPY --from=binutils . /
 COPY --from=make . /