diff --git a/CMakeExternals/ZLIB.cmake b/CMakeExternals/ZLIB.cmake
index 80eb9a03ec..c5359a0331 100644
--- a/CMakeExternals/ZLIB.cmake
+++ b/CMakeExternals/ZLIB.cmake
@@ -1,29 +1,29 @@
 set(proj ZLIB)
 set(proj_DEPENDENCIES "")
 
 if(MITK_USE_${proj})
   set(${proj}_DEPENDS ${proj})
 
   if(DEFINED ${proj}_DIR AND NOT EXISTS ${${proj}_DIR})
     message(FATAL_ERROR "${proj}_DIR variable is defined but corresponds to non-existing directory!")
   endif()
 
   find_package(ZLIB QUIET)
 
   if(NOT DEFINED ${proj}_DIR AND NOT ZLIB_FOUND)
     ExternalProject_Add(${proj}
       GIT_REPOSITORY https://github.com/madler/zlib.git
-      GIT_TAG v1.2.11
+      GIT_TAG v1.2.13
       CMAKE_GENERATOR ${gen}
       CMAKE_GENERATOR_PLATFORM ${gen_platform}
       CMAKE_ARGS ${ep_common_args}
       CMAKE_CACHE_ARGS ${ep_common_cache_args}
       CMAKE_CACHE_DEFAULT_ARGS ${ep_common_cache_default_args}
       DEPENDS ${proj_DEPENDENCIES}
     )
 
     set(${proj}_DIR ${ep_prefix})
   else()
     mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
   endif()
 endif()