diff --git a/extern/zlib/Readme.txt b/extern/zlib/Readme.txt
index 3dc74ee406..94fdd6bbdd 100644
--- a/extern/zlib/Readme.txt
+++ b/extern/zlib/Readme.txt
@@ -4,9 +4,9 @@ architectures.
 
 The source code of zlib library was downloaded from 
 
-  http://zlib.net/zlib1213.zip
+  https://www.zlib.net/zlib13.zip
 
-It was built with MSVC17 compilers using commands specified at win32/Makefile.msc:
+It was built with MSVC19 compilers using commands specified at win32/Makefile.msc:
 
 win32: 
 nmake -f win32/Makefile.msc 
diff --git a/extern/zlib/zlib.exe b/extern/zlib/zlib.exe
index 8c922cad49..4429b35090 100644
Binary files a/extern/zlib/zlib.exe and b/extern/zlib/zlib.exe differ