diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index 553c528..85ae8c8 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = MentOS
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.4.0
+PROJECT_NUMBER         = 0.5.1
 
 # 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
diff --git a/mentos/inc/version.h b/mentos/inc/version.h
index a82eb80..60e92eb 100644
--- a/mentos/inc/version.h
+++ b/mentos/inc/version.h
@@ -18,10 +18,10 @@
 #define OS_MAJOR_VERSION 0
 
 /// Minor version of the operating system.
-#define OS_MINOR_VERSION 4
+#define OS_MINOR_VERSION 5
 
 /// Micro version of the operating system.
-#define OS_MICRO_VERSION 0
+#define OS_MICRO_VERSION 1
 
 /// Helper to transform the given argument into a string.
 #define OS_STR_HELPER(x) #x