thodg/libgit2

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6f731d4..6f1a97e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -127,6 +127,9 @@ STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_V
 STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_VERSION_REV "${GIT2_HEADER}")
 SET(LIBGIT2_VERSION_STRING "${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}.${LIBGIT2_VERSION_REV}")
 
+FILE(STRINGS "include/git2/version.h" GIT2_HEADER_SOVERSION REGEX "^#define LIBGIT2_SOVERSION [0-9]+$")
+STRING(REGEX REPLACE "^.*LIBGIT2_SOVERSION ([0-9]+)$" "\\1" LIBGIT2_SOVERSION "${GIT2_HEADER_SOVERSION}")
+
 # Find required dependencies
 INCLUDE_DIRECTORIES(src include)
 
@@ -397,7 +400,7 @@ MSVC_SPLIT_SOURCES(git2)
 
 IF (SONAME)
 	SET_TARGET_PROPERTIES(git2 PROPERTIES VERSION ${LIBGIT2_VERSION_STRING})
-	SET_TARGET_PROPERTIES(git2 PROPERTIES SOVERSION ${LIBGIT2_VERSION_MAJOR})
+	SET_TARGET_PROPERTIES(git2 PROPERTIES SOVERSION ${LIBGIT2_SOVERSION})
 	IF (LIBGIT2_FILENAME)
 		ADD_DEFINITIONS(-DLIBGIT2_FILENAME=\"${LIBGIT2_FILENAME}\")
 		SET_TARGET_PROPERTIES(git2 PROPERTIES OUTPUT_NAME ${LIBGIT2_FILENAME})
diff --git a/include/git2/version.h b/include/git2/version.h
index c4c5e8e..5bda427 100644
--- a/include/git2/version.h
+++ b/include/git2/version.h
@@ -7,9 +7,11 @@
 #ifndef INCLUDE_git_version_h__
 #define INCLUDE_git_version_h__
 
-#define LIBGIT2_VERSION "0.20.0"
+#define LIBGIT2_VERSION "0.21.0"
 #define LIBGIT2_VER_MAJOR 0
-#define LIBGIT2_VER_MINOR 20
+#define LIBGIT2_VER_MINOR 21
 #define LIBGIT2_VER_REVISION 0
 
+#define LIBGIT2_SOVERSION 21
+
 #endif