diff --git a/CMakeExternals/CTK.cmake b/CMakeExternals/CTK.cmake
index 96409df2ca..c328933ed7 100644
--- a/CMakeExternals/CTK.cmake
+++ b/CMakeExternals/CTK.cmake
@@ -1,38 +1,45 @@
 #-----------------------------------------------------------------------------
 # CTK
 #-----------------------------------------------------------------------------
 
 IF(MITK_USE_CTK)
 
   # Sanity checks
   IF(DEFINED CTK_DIR AND NOT EXISTS ${CTK_DIR})
     MESSAGE(FATAL_ERROR "CTK_DIR variable is defined but corresponds to non-existing directory")
   ENDIF()
 
   SET(proj CTK)
   SET(proj_DEPENDENCIES )
   SET(CTK_DEPENDS ${proj})
 
   IF(NOT DEFINED CTK_DIR)
+    
+    SET(revision_tag e80497a32aadaf2099f7)
+    IF(${proj}_REVISION_TAG)
+      SET(revision_tag ${${proj}_REVISION_TAG})
+    ENDIF()
+  
     ExternalProject_Add(${proj}
       GIT_REPOSITORY git://github.com/commontk/CTK.git
-      GIT_TAG f6c3e844ffedbac6f3139265fbdd19c979e44152
+      GIT_TAG ${revision_tag}
       BINARY_DIR ${proj}-build
+      UPDATE_COMMAND ""
       INSTALL_COMMAND ""
       CMAKE_GENERATOR ${gen}
       CMAKE_ARGS
         ${ep_common_args}
         -DDESIRED_QT_VERSION:STRING=4
         -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
         -DCTK_LIB_DICOM/Widgets:BOOL=ON
       DEPENDS ${proj_DEPENDENCIES}
      )
   SET(CTK_DIR ${CMAKE_CURRENT_BINARY_DIR}/${proj}-build)
   
   ELSE()
 
     mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
     
   ENDIF()
   
 ENDIF()
diff --git a/CMakeExternals/MITKData.cmake b/CMakeExternals/MITKData.cmake
index c9cbbbfa40..e937a1c10d 100644
--- a/CMakeExternals/MITKData.cmake
+++ b/CMakeExternals/MITKData.cmake
@@ -1,33 +1,39 @@
 #-----------------------------------------------------------------------------
 # MITK Data
 #-----------------------------------------------------------------------------
 
 # Sanity checks
 IF(DEFINED MITK_DATA_DIR AND NOT EXISTS ${MITK_DATA_DIR})
   MESSAGE(FATAL_ERROR "MITK_DATA_DIR variable is defined but corresponds to non-existing directory")
 ENDIF()
 
 SET(proj MITK-Data)
 SET(proj_DEPENDENCIES)
 SET(MITK-Data_DEPENDS ${proj})
 
 IF(BUILD_TESTING)
 
+  SET(revision_tag 4fa450c29ebd819419)
+  IF(${proj}_REVISION_TAG)
+    SET(revision_tag ${${proj}_REVISION_TAG})
+  ENDIF()
+
   ExternalProject_Add(${proj}
     GIT_REPOSITORY http://git.mitk.org/MITK-Data.git
-    GIT_TAG "origin/master"
+    GIT_TAG ${revision_tag}
+    UPDATE_COMMAND ""
     CONFIGURE_COMMAND ""
     BUILD_COMMAND ""
     INSTALL_COMMAND ""
     DEPENDS ${proj_DEPENDENCIES}
   )
   
   SET(MITK_DATA_DIR ${ep_source_dir}/${proj})
   
 ELSE()
 
   mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
   
 ENDIF(BUILD_TESTING)