diff --git a/docs/conf.py b/docs/conf.py
index 98ace22..bc91c26 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.3'
+version = '0.3.1'
 # The full version, including alpha/beta/rc tags.
-release = '0.3'
+release = '0.3.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index ea570c0..932a277 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 
 setup(
     name='metrology',
-    version='0.3',
+    version='0.3.1',
     description='A library to easily measure what\'s going on in your python.',
     author='Timothée Peignier',
     author_email='timothee.peignier@tryphon.org',
@@ -12,8 +12,8 @@
     packages=find_packages(),
     zip_safe=False,
     install_requires=[
-        'atomic>=0.3',
-        'bintrees'
+        'atomic>=0.3.2',
+        'bintrees>=1.0.0'
     ],
     include_package_data=True,
     classifiers=[
diff --git a/tox.ini b/tox.ini
index 9197774..f22921c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist = py26,py27,py32,pypy
 [testenv]
 deps =
     pytest
-    atomic
-    bintrees
+    atomic>=0.3.2
+    bintrees>=1.0.0
     mock
 commands = py.test