diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1649287..e194bbc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - Updated gcc to version 12.2.0.
 - Updated expat to version 2.5.0.
 - Updated mpfr to version 4.1.1.
+- Updated zlib to version 1.2.13.
 
 [221106](https://github.com/FreddieChopin/bleeding-edge-toolchain/compare/221023...221106)
 ------------------------------------------------------------------------------------------
diff --git a/build-bleeding-edge-toolchain.sh b/build-bleeding-edge-toolchain.sh
index 5bb0b62..26b5439 100755
--- a/build-bleeding-edge-toolchain.sh
+++ b/build-bleeding-edge-toolchain.sh
@@ -23,7 +23,7 @@ mpcVersion="1.2.1"
 mpfrVersion="4.1.1"
 newlibVersion="4.2.0.20211231"
 pythonVersion="2.7.18"
-zlibVersion="1.2.12"
+zlibVersion="1.2.13"
 
 top="$(pwd)"
 buildNative="buildNative"