diff --git a/tox.ini b/tox.ini
index 75bdd25..ae03b62 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,15 +3,12 @@ envlist = py25,py26,py27,py3
 
 [testenv]
 commands=py.test --junitxml=junit-{envname}.xml
-deps = pytest,requests
+deps = 
+    pytest==2.0.2
+    requests==0.3.0
     
-[testenv:py25]
-simplejson = pytest simplejson
-
 [testenv:pypy]
 basepython=/usr/bin/pypy-c
-simplejson = pytest simplejson
 
 [testenv:py3]
-basepython=/usr/bin/python3
-simplejson = pytest
\ No newline at end of file
+basepython=/usr/bin/python3
\ No newline at end of file