diff --git a/lib/spack/spack/__init__.py b/lib/spack/spack/__init__.py
index c7a155597fe..8c6e0ba5277 100644
--- a/lib/spack/spack/__init__.py
+++ b/lib/spack/spack/__init__.py
@@ -105,7 +105,7 @@
 
 # Version information
 from spack.version import Version
-spack_version = Version("0.9")
+spack_version = Version("0.9.1")
 
 #
 # Executables used by Spack