diff --git a/ChangeLog.md b/ChangeLog.md
index b8b984af170e5..9f23d262d4f00 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -30,6 +30,7 @@ See docs/process.md for more on how version tagging works.
   a conflict between the `majorVersion` requested and the WebGL support defined
   via linker flags (`MIN_WEBGL_VERSION` and `MAX_WEBGL_VERSION`). This warning
   will be turned into a hard failure in a future release. (#23372, #23416)
+- zlib port updated from 1.2.13 to 1.3.1. (#23462)
 
 4.0.0 - 01/14/25
 ----------------
diff --git a/tools/ports/zlib.py b/tools/ports/zlib.py
index f10696458b094..068fb51080c2c 100644
--- a/tools/ports/zlib.py
+++ b/tools/ports/zlib.py
@@ -5,8 +5,8 @@
 
 import os
 
-VERSION = '1.2.13'
-HASH = '44b834fbfb50cca229209b8dbe1f96b258f19a49f5df23b80970b716371d856a4adf525edb4c6e0e645b180ea949cb90f5365a1d896160f297f56794dd888659'
+VERSION = '1.3.1'
+HASH = '8c9642495bafd6fad4ab9fb67f09b268c69ff9af0f4f20cf15dfc18852ff1f312bd8ca41de761b3f8d8e90e77d79f2ccacd3d4c5b19e475ecf09d021fdfe9088'
 
 
 def needed(settings):