diff --git a/pyensembl/__init__.py b/pyensembl/__init__.py
index ca9645b..99e36a7 100644
--- a/pyensembl/__init__.py
+++ b/pyensembl/__init__.py
@@ -35,7 +35,7 @@
 )
 from .transcript import Transcript
 
-__version__ = '0.9.0'
+__version__ = '0.9.1'
 
 _cache = {}