diff --git a/lib/spack/spack/__init__.py b/lib/spack/spack/__init__.py
index 1f8926e28d3..34a7b01616a 100644
--- a/lib/spack/spack/__init__.py
+++ b/lib/spack/spack/__init__.py
@@ -88,7 +88,7 @@
 # Initialize various data structures & objects at the core of Spack.
 #-----------------------------------------------------------------------------
 # Version information
-spack_version = Version("0.9.1")
+spack_version = Version("0.10.0")
 
 
 # Set up the default packages database.