diff --git a/curvesim/version.py b/curvesim/version.py
index cd40c1e80..0ee51eb43 100644
--- a/curvesim/version.py
+++ b/curvesim/version.py
@@ -4,7 +4,7 @@
 The version number should not be changed manually here.  Instead,
 a tool such as `bump2version` should be used.
 """
-__version__ = "0.4.0.a2"
+__version__ = "0.4.0"
 # FIXME: this logic isn't quite correct here for pre-release versions
 __version_info__ = tuple(
     int(num) if num.isdigit() else num for num in __version__.split(".")
diff --git a/setup.cfg b/setup.cfg
index 5690ccbfd..710cb182f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.4.0.a2
+current_version = 0.4.0
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\.(?P<release>.*)(?P<build>\d+))?
 serialize = 
 	{major}.{minor}.{patch}.{release}{build}