diff --git a/Testing/CMakeLists.txt b/Testing/CMakeLists.txt
index f0e113418dbd2caf34a401a6be7dc4e4d66acc69..6a98a83684007ea983cc3cd838e3d9f7c96b0265 100644
--- a/Testing/CMakeLists.txt
+++ b/Testing/CMakeLists.txt
@@ -15,7 +15,7 @@ IF(OTB_BINARY_DIR)
   ADD_SUBDIRECTORY(Utilities)
 ELSE(OTB_BINARY_DIR)
   # We are building as a stand-alone project.
-  CMAKE_MINIMUM_REQUIRED(VERSION 2.4)
+  CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
   SET(LIBRARY_OUTPUT_PATH ${OTBTesting_BINARY_DIR}/bin CACHE PATH "Single output directory for building all libraries.")
   SET(EXECUTABLE_OUTPUT_PATH ${OTBTesting_BINARY_DIR}/bin CACHE PATH "Single output directory for building all executables.")
   MARK_AS_ADVANCED(LIBRARY_OUTPUT_PATH EXECUTABLE_OUTPUT_PATH)