diff --git a/bin/compile b/bin/compile
index 3b83faf..9c0dd4a 100755
--- a/bin/compile
+++ b/bin/compile
@@ -11,7 +11,8 @@ PCRE_VERSION="10.47"
 PCRE_TARBALL="pcre2-${PCRE_VERSION}.tar.gz"
 SIGIL_VERSION="0.10.1"
 SIGIL_TARBALL="gliderlabs-sigil_${SIGIL_VERSION}_linux_amd64.tgz"
-ZLIB_VERSION="1.3"
+# https://github.com/madler/zlib/releases
+ZLIB_VERSION="1.3.1"
 ZLIB_TARBALL="zlib-${ZLIB_VERSION}.tar.gz"
 
 suppress() {