diff --git a/RELEASE b/RELEASE
index 5bc1cc4..23a63f5 100644
--- a/RELEASE
+++ b/RELEASE
@@ -1 +1 @@
-2.2.7
+2.2.8
diff --git a/doc/Doxyfile b/doc/Doxyfile
index 6e75771..b5c75fd 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -31,7 +31,7 @@
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.2.7
+PROJECT_NUMBER         = 2.2.8
 
 # With the PROJECT_LOGO tag one can specify a logo or icon that is included
 # in the documentation. The maximum height of the logo should not exceed 55