From dfec155628e29f79cb538052ca3acbb031c763ab Mon Sep 17 00:00:00 2001
From: Zachary Ware <zach@python.org>
Date: Thu, 1 Feb 2024 17:54:02 -0600
Subject: [PATCH] gh-111239: Update Windows build to use zlib 1.3.1 (GH-114877)
 (cherry picked from commit 618d7256e78da8200f6e2c6235094a1ef885dca4)

Co-authored-by: Zachary Ware <zach@python.org>
---
 .../next/Windows/2024-02-01-14-35-05.gh-issue-111239.SO7SUF.rst | 1 +
 PCbuild/get_externals.bat                                       | 2 +-
 PCbuild/python.props                                            | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Windows/2024-02-01-14-35-05.gh-issue-111239.SO7SUF.rst

diff --git a/Misc/NEWS.d/next/Windows/2024-02-01-14-35-05.gh-issue-111239.SO7SUF.rst b/Misc/NEWS.d/next/Windows/2024-02-01-14-35-05.gh-issue-111239.SO7SUF.rst
new file mode 100644
index 00000000000000..ea82c3b941f802
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2024-02-01-14-35-05.gh-issue-111239.SO7SUF.rst
@@ -0,0 +1 @@
+Update Windows builds to use zlib v1.3.1.
diff --git a/PCbuild/get_externals.bat b/PCbuild/get_externals.bat
index 1b60e47c527505..b44878fd8f8484 100644
--- a/PCbuild/get_externals.bat
+++ b/PCbuild/get_externals.bat
@@ -59,7 +59,7 @@ if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.13.
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.13.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tix-8.4.3.6
 set libraries=%libraries%                                       xz-5.2.5
-set libraries=%libraries%                                       zlib-1.2.13
+set libraries=%libraries%                                       zlib-1.3.1
 
 for %%e in (%libraries%) do (
     if exist "%EXTERNALS_DIR%\%%e" (
diff --git a/PCbuild/python.props b/PCbuild/python.props
index 9a003c6b8c1307..fcdd9b407568ba 100644
--- a/PCbuild/python.props
+++ b/PCbuild/python.props
@@ -78,7 +78,7 @@
     <opensslOutDir Condition="$(opensslOutDir) == ''">$(ExternalsDir)openssl-bin-3.0.13\$(ArchName)\</opensslOutDir>
     <opensslIncludeDir Condition="$(opensslIncludeDir) == ''">$(opensslOutDir)include</opensslIncludeDir>
     <nasmDir Condition="$(nasmDir) == ''">$(ExternalsDir)\nasm-2.11.06\</nasmDir>
-    <zlibDir Condition="$(zlibDir) == ''">$(ExternalsDir)\zlib-1.2.13\</zlibDir>
+    <zlibDir Condition="$(zlibDir) == ''">$(ExternalsDir)\zlib-1.3.1\</zlibDir>
   </PropertyGroup>
 
   <PropertyGroup>