diff --git a/zlib/LICENSE b/zlib/LICENSE
index 9f056865b..01a53259d 100644
--- a/zlib/LICENSE
+++ b/zlib/LICENSE
@@ -1,4 +1,4 @@
-version 1.2.11, January 15th, 2017
+version 1.2.12, January 15th, 2017
 
 Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
 
diff --git a/zlib/deflate.c b/zlib/deflate.c
index 3e76e185c..8257dd267 100644
--- a/zlib/deflate.c
+++ b/zlib/deflate.c
@@ -59,7 +59,7 @@ int x86_check_features() { return 0; }
 #endif
 
 const char deflate_copyright[] =
-   " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
+   " deflate 1.2.12 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
diff --git a/zlib/inftrees.c b/zlib/inftrees.c
index 2ea08fc13..9473ab903 100644
--- a/zlib/inftrees.c
+++ b/zlib/inftrees.c
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 
 const char inflate_copyright[] =
-   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
+   " inflate 1.2.12 Copyright 1995-2017 Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
diff --git a/zlib/simd.patch b/zlib/simd.patch
index 75828d26e..92e3995ed 100644
--- a/zlib/simd.patch
+++ b/zlib/simd.patch
@@ -553,7 +553,7 @@ index 1ec761448de9..aa0c9c67a6dc 100644
 +#include "x86.h"
  
  const char deflate_copyright[] =
-    " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
+    " deflate 1.2.12 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
 @@ -86,7 +87,7 @@ local block_state deflate_huff   OF((deflate_state *s, int flush));
  local void lm_init        OF((deflate_state *s));
  local void putShortMSB    OF((deflate_state *s, uInt b));
diff --git a/zlib/zlib.h b/zlib/zlib.h
index 68d47a723..8b828da17 100644
--- a/zlib/zlib.h
+++ b/zlib/zlib.h
@@ -37,7 +37,7 @@
 extern "C" {
 #endif
 
-#define ZLIB_VERSION "1.2.11"
+#define ZLIB_VERSION "1.2.12"
 #define ZLIB_VERNUM 0x12b0
 #define ZLIB_VER_MAJOR 1
 #define ZLIB_VER_MINOR 2