diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07068eb61787d3b7096cbeece589f776bd8bc171..62233bf22f08f2f9fb58357427454bc6867aba8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ set(CMAKE_C_STANDARD 11)
 SET( CPACK_PACKAGE_NAME  "${PROJECT_NAME}")
 SET( CPACK_PACKAGE_VERSION_MAJOR 4)
 SET( CPACK_PACKAGE_VERSION_MINOR 0)
-SET( CPACK_PACKAGE_VERSION_PATCH 20)
+SET( CPACK_PACKAGE_VERSION_PATCH 21)
 
 
 # init CellFrame SDK
diff --git a/cellframe-sdk b/cellframe-sdk
index f9a003f2191d47df3e72b0cfaaac8669d5975d35..015d222f80c9bdddd3e1e461a2685a74117f075a 160000
--- a/cellframe-sdk
+++ b/cellframe-sdk
@@ -1 +1 @@
-Subproject commit f9a003f2191d47df3e72b0cfaaac8669d5975d35
+Subproject commit 015d222f80c9bdddd3e1e461a2685a74117f075a