diff --git a/.travis.yml b/.travis.yml
index 04ba1bc..2c5f313 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: python
 python:
 - 2.7
-- pypy
 - 3.3
 - 3.4
 before_install:
diff --git a/README.rst b/README.rst
index efe1ed3..2ba84f6 100644
--- a/README.rst
+++ b/README.rst
@@ -20,15 +20,15 @@ This project follows the standard fork and pull request model of development.
 If you want to contribute changes, then fork the project and code
 away. To set up the environment:
 
-    virtualenv env
-    source env/bin/activate
-    pip install -qr dev-requirements.txt
+* virtualenv env
+* source env/bin/activate
+* pip install -qr dev-requirements.txt
 
 To test across supported platforms:
-    tox
+* tox
 
 To build the docs (in *build/sphinx/html*):
-    ./setup.py build_sphinx
+* ./setup.py build_sphinx
 
 Version History
 ---------------
diff --git a/requirements.txt b/requirements.txt
index bbaab97..55d2301 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
-blist==1.3.6
-cassandra-driver==2.5.1
+blist>=1.3.6,<2
+cassandra-driver>=2.5.1,<3
+tornado>=3.2
diff --git a/test-requirements.txt b/test-requirements.txt
index 952e16a..81f7334 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,4 +9,3 @@
 # minimize breakage to our dev environment.
 coveralls>=0.4,<1.0
 nose>=1.3.1,<2.0.0
-tornado>=3.0.0,<4.0.0