diff --git a/requirements.txt b/requirements.txt
index 453306b..c064dd3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-Flask==0.10.1
-Jinja2==2.7.3
-MarkupSafe==0.23
-Werkzeug==0.10.4
-itsdangerous==0.24
-nose==1.3.6
-pymongo==2.8
-wsgiref==0.1.2
+wsgiref==0.1.2; python_version < '3.0'
+Flask>=0.10.1
+Jinja2>=2.7.3
+MarkupSafe>=1.0
+Werkzeug>=0.10.4
+itsdangerous>=0.24
+nose>=1.3.6
+pymongo>=2.8