diff --git a/ports/zlib/0003-build-static-or-shared-not-both.patch b/ports/zlib/0002-build-static-or-shared-not-both.patch
similarity index 80%
rename from ports/zlib/0003-build-static-or-shared-not-both.patch
rename to ports/zlib/0002-build-static-or-shared-not-both.patch
index c9f2ecf197..60e3f8d39d 100644
--- a/ports/zlib/0003-build-static-or-shared-not-both.patch
+++ b/ports/zlib/0002-build-static-or-shared-not-both.patch
@@ -1,8 +1,7 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index f46c8e6..6fa5575 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -121,9 +121,11 @@ set(ZLIB_SRCS
+@@ -123,9 +123,11 @@ set(ZLIB_SRCS
  )
  
  if(NOT MINGW)
@@ -14,7 +13,7 @@ index f46c8e6..6fa5575 100644
  endif()
  
  # parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
-@@ -144,13 +146,16 @@ if(MINGW)
+@@ -146,15 +148,17 @@ if(MINGW)
                              -I ${CMAKE_CURRENT_BINARY_DIR}
                              -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
                              -i ${CMAKE_CURRENT_SOURCE_DIR}/win32/zlib1.rc)
@@ -24,8 +23,10 @@ index f46c8e6..6fa5575 100644
  endif(MINGW)
  
 -add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
--add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
 +add_library(zlib ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+ target_include_directories(zlib PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
+-add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+-target_include_directories(zlibstatic PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
 +if (BUILD_SHARED_LIBS)
  set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
  set_target_properties(zlib PROPERTIES SOVERSION 1)
@@ -33,21 +34,21 @@ index f46c8e6..6fa5575 100644
  
  if(NOT CYGWIN)
      # This property causes shared libraries on Linux to have the full version
-@@ -165,7 +170,7 @@ endif()
+@@ -169,7 +173,7 @@ endif()
  
  if(UNIX)
      # On unix-like platforms the library is almost always called libz
 -   set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
 +   set_target_properties(zlib PROPERTIES OUTPUT_NAME z)
-    if(NOT APPLE)
+    if(NOT APPLE AND NOT(CMAKE_SYSTEM_NAME STREQUAL AIX))
       set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
     endif()
-@@ -175,7 +180,7 @@ elseif(BUILD_SHARED_LIBS AND WIN32)
+@@ -179,7 +183,7 @@ elseif(BUILD_SHARED_LIBS AND WIN32)
  endif()
  
  if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
 -    install(TARGETS zlib zlibstatic
-+    install(TARGETS zlib
++    install(TARGETS zlib 
          RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
          ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
          LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
diff --git a/ports/zlib/0002-skip-building-examples.patch b/ports/zlib/0002-skip-building-examples.patch
deleted file mode 100644
index 8183f2ab20..0000000000
--- a/ports/zlib/0002-skip-building-examples.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b412dc7..f46c8e6 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -194,6 +194,7 @@ endif()
- # Example binaries
- #============================================================================
- 
-+if (0)
- add_executable(example test/example.c)
- target_link_libraries(example zlib)
- add_test(example example)
-@@ -211,3 +212,4 @@ if(HAVE_OFF64_T)
-     target_link_libraries(minigzip64 zlib)
-     set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
- endif()
-+endif()
diff --git a/ports/zlib/0004-android-and-mingw-fixes.patch b/ports/zlib/0003-android-and-mingw-fixes.patch
similarity index 80%
rename from ports/zlib/0004-android-and-mingw-fixes.patch
rename to ports/zlib/0003-android-and-mingw-fixes.patch
index e93173f246..a051372ca5 100644
--- a/ports/zlib/0004-android-and-mingw-fixes.patch
+++ b/ports/zlib/0003-android-and-mingw-fixes.patch
@@ -1,8 +1,7 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 6fa5575..7c345db 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -56,7 +56,7 @@ endif()
+@@ -58,7 +58,7 @@ endif()
  #
  check_include_file(unistd.h Z_HAVE_UNISTD_H)
  
@@ -11,7 +10,7 @@ index 6fa5575..7c345db 100644
      set(CMAKE_DEBUG_POSTFIX "d")
      add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
      add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
-@@ -133,7 +133,7 @@ file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
+@@ -135,7 +135,7 @@ file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
  string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
      "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})
  
@@ -20,7 +19,7 @@ index 6fa5575..7c345db 100644
      # This gets us DLL resource information when compiling on MinGW.
      if(NOT CMAKE_RC_COMPILER)
          set(CMAKE_RC_COMPILER windres.exe)
-@@ -149,7 +149,7 @@ if(MINGW)
+@@ -151,7 +151,7 @@ if(MINGW)
      if(BUILD_SHARED_LIBS)
      set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
      endif()
@@ -28,4 +27,4 @@ index 6fa5575..7c345db 100644
 +endif(MINGW AND NOT ANDROID)
  
  add_library(zlib ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
- if (BUILD_SHARED_LIBS)
+ target_include_directories(zlib PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/ports/zlib/portfile.cmake b/ports/zlib/portfile.cmake
index 1ec750bead..61733a4b2e 100644
--- a/ports/zlib/portfile.cmake
+++ b/ports/zlib/portfile.cmake
@@ -3,13 +3,12 @@ vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO madler/zlib
     REF v${VERSION}
-    SHA512 78eecf335b14af1f7188c039a4d5297b74464d61156e4f12a485c74beec7d62c4159584ad482a07ec57ae2616d58873e45b09cb8ea822bb5b17e43d163df84e9
+    SHA512 8c9642495bafd6fad4ab9fb67f09b268c69ff9af0f4f20cf15dfc18852ff1f312bd8ca41de761b3f8d8e90e77d79f2ccacd3d4c5b19e475ecf09d021fdfe9088
     HEAD_REF master
     PATCHES
         0001-Prevent-invalid-inclusions-when-HAVE_-is-set-to-0.patch
-        0002-skip-building-examples.patch
-        0003-build-static-or-shared-not-both.patch
-        0004-android-and-mingw-fixes.patch
+        0002-build-static-or-shared-not-both.patch
+        0003-android-and-mingw-fixes.patch
 )
 
 # This is generated during the cmake build
@@ -19,6 +18,7 @@ vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS
         -DSKIP_INSTALL_FILES=ON
+        -DZLIB_BUILD_EXAMPLES=OFF
     OPTIONS_DEBUG
         -DSKIP_INSTALL_HEADERS=ON
 )
@@ -49,7 +49,5 @@ else()
     vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/include/zconf.h" "ifdef ZLIB_DLL" "if 1")
 endif()
 
-vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/include/zlib.h" "#define ZLIB_VERSION \"1.3\"" "#define ZLIB_VERSION \"1.3.0\"")
-
 file(COPY "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
 file(INSTALL "${SOURCE_PATH}/LICENSE" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)
diff --git a/ports/zlib/vcpkg.json b/ports/zlib/vcpkg.json
index b4d578e45d..f54a99d43e 100644
--- a/ports/zlib/vcpkg.json
+++ b/ports/zlib/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "zlib",
-  "version": "1.3",
+  "version": "1.3.1",
   "description": "A compression library",
   "homepage": "https://www.zlib.net/",
   "license": "Zlib",
diff --git a/versions/baseline.json b/versions/baseline.json
index 4e050fb8b3..e71f83e85b 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -9473,7 +9473,7 @@
       "port-version": 3
     },
     "zlib": {
-      "baseline": "1.3",
+      "baseline": "1.3.1",
       "port-version": 0
     },
     "zlib-ng": {
diff --git a/versions/z-/zlib.json b/versions/z-/zlib.json
index 63e0ea6ed6..a994f3607a 100644
--- a/versions/z-/zlib.json
+++ b/versions/z-/zlib.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "3f05e04b9aededb96786a911a16193cdb711f0c9",
+      "version": "1.3.1",
+      "port-version": 0
+    },
     {
       "git-tree": "5ac18c6e6e3e2bf5a9e3d0bc8a845f198e4c4e05",
       "version": "1.3",