diff --git a/requirements.txt b/requirements.txt
index 0cf57a7..773965e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,14 @@
-argparse
-nose
-numpy
-pandas
-python-dateutil
-pytz
-rpy2
-scipy
-six
-statsmodels
-wsgire
+MarkupSafe==0.18
+argparse==1.2.1
+clint==0.3.1
+itsdangerous==0.23
+numpy==1.8.0
+pandas==0.12.0
+python-dateutil==2.2
+pytz==2013.8
+rpy2==2.3.8
+scikit-learn==0.14.1
+scipy==0.13.2
+six==1.4.1
+wsgiref==0.1.2
+nose==1.3.0