diff --git a/ryu/__init__.py b/ryu/__init__.py
index 7492fb1e..23dafe92 100644
--- a/ryu/__init__.py
+++ b/ryu/__init__.py
@@ -14,5 +14,5 @@
 # limitations under the License.
 
 
-version_info = (1, 8)
+version_info = (1, 9)
 version = '.'.join(map(str, version_info))