diff --git a/doc/doxygen/lwip.Doxyfile b/doc/doxygen/lwip.Doxyfile
index 78cc0f28..b7e6bc93 100644
--- a/doc/doxygen/lwip.Doxyfile
+++ b/doc/doxygen/lwip.Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "lwIP"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "2.1.0"
+PROJECT_NUMBER         = "2.2.0.dev"
 
 # 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
diff --git a/src/include/lwip/init.h b/src/include/lwip/init.h
index 951b08e6..34e8937e 100644
--- a/src/include/lwip/init.h
+++ b/src/include/lwip/init.h
@@ -52,13 +52,13 @@ extern "C" {
 /** X.x.x: Major version of the stack */
 #define LWIP_VERSION_MAJOR      2
 /** x.X.x: Minor version of the stack */
-#define LWIP_VERSION_MINOR      1
+#define LWIP_VERSION_MINOR      2
 /** x.x.X: Revision of the stack */
 #define LWIP_VERSION_REVISION   0
 /** For release candidates, this is set to 1..254
   * For official releases, this is set to 255 (LWIP_RC_RELEASE)
   * For development versions (Git), this is set to 0 (LWIP_RC_DEVELOPMENT) */
-#define LWIP_VERSION_RC         LWIP_RC_RELEASE
+#define LWIP_VERSION_RC         LWIP_RC_DEVELOPMENT
 
 /** LWIP_VERSION_RC is set to LWIP_RC_RELEASE for official releases */
 #define LWIP_RC_RELEASE         255