diff --git a/CHANGELOG b/CHANGELOG
index 47084af5..928d763c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,12 @@
+Changes to version 2.1.1
+------------------------
+- CS 104 slave: added functions IMasterConnection_getPeerAddress and IMasterConnection_close
+- CS 101/CS 104 slave: set P/N=1 (negative) when sending COT=44 or COT=45
+- improved compatibility with VxWorks
+- CS 104 slave: fixed bug in counter interrogation command handling - free stack allocated memory
+- fixed some include file problems
+
+
 Changes to version 2.1.0
 ------------------------
 - CS104 slave: added support for multiple redundancy groups
@@ -10,6 +19,7 @@ Changes to version 2.1.0
 - CS101 unbalanced master: fixed state machine problem with multiple slaves (some responses don't change state and master keeps locked on the slave)
 - optionally compile library without HAL to simply using together with libiec61850
 
+
 Changes to version 2.0.2
 ------------------------
 - CS104 slave: added new CS104_ConnectionEventHandler to track connection events
diff --git a/lib60870-C/CMakeLists.txt b/lib60870-C/CMakeLists.txt
index 55a06e05..85279f28 100644
--- a/lib60870-C/CMakeLists.txt
+++ b/lib60870-C/CMakeLists.txt
@@ -12,7 +12,7 @@ ENABLE_TESTING()
 
 set(LIB_VERSION_MAJOR "2")
 set(LIB_VERSION_MINOR "1")
-set(LIB_VERSION_PATCH "0")
+set(LIB_VERSION_PATCH "1")
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/third_party/cmake/modules/")
 
diff --git a/lib60870-C/Doxyfile b/lib60870-C/Doxyfile
index d3dc30bb..ca0cfa8d 100644
--- a/lib60870-C/Doxyfile
+++ b/lib60870-C/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "lib60870-C"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2.1.0
+PROJECT_NUMBER         = 2.1.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a