diff --git a/Externals/enet/CMakeLists.txt b/Externals/enet/CMakeLists.txt
index 24f03965159..f364ff7f5b2 100644
--- a/Externals/enet/CMakeLists.txt
+++ b/Externals/enet/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.12)
 
 project(enet)
 
diff --git a/Externals/gtest/CMakeLists.txt b/Externals/gtest/CMakeLists.txt
index b09c46ed32b..62d2f55fb2c 100644
--- a/Externals/gtest/CMakeLists.txt
+++ b/Externals/gtest/CMakeLists.txt
@@ -50,7 +50,7 @@ else()
   cmake_policy(SET CMP0048 NEW)
   project(gtest VERSION 1.9.0 LANGUAGES CXX C)
 endif()
-cmake_minimum_required(VERSION 2.6.4)
+cmake_minimum_required(VERSION 2.8.12)
 
 if (POLICY CMP0063) # Visibility
   cmake_policy(SET CMP0063 NEW)
diff --git a/Externals/mbedtls/CMakeLists.txt b/Externals/mbedtls/CMakeLists.txt
index c4979c51ad0..3477fa40ae1 100644
--- a/Externals/mbedtls/CMakeLists.txt
+++ b/Externals/mbedtls/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.12)
 project("mbed TLS" C)
 
 set(CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE}
diff --git a/Externals/miniupnpc/CMakeLists.txt b/Externals/miniupnpc/CMakeLists.txt
index efd45e000ec..f5d3f2e3ade 100644
--- a/Externals/miniupnpc/CMakeLists.txt
+++ b/Externals/miniupnpc/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.12)
 
 project(miniupnpc C)
 set(MINIUPNPC_VERSION 1.9)
diff --git a/Externals/pugixml/CMakeLists.txt b/Externals/pugixml/CMakeLists.txt
index 0f2de7c8372..30f06ae21da 100644
--- a/Externals/pugixml/CMakeLists.txt
+++ b/Externals/pugixml/CMakeLists.txt
@@ -1,6 +1,6 @@
 project(pugixml)
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.12)
 
 option(BUILD_SHARED_LIBS "Build shared instead of static library" OFF)