diff --git a/requirements.txt b/requirements.txt
index 3026029..eac9336 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-numpy==1.10.2
-scipy==0.16.1
-pandas==0.17.0
-scikit-learn==0.17
-nose==1.3.7
+numpy >= 1.1, < 2.0
+scipy >= 0.13, < 0.17
+pandas >= 0.13, < 0.18
+scikit-learn >= 0.14, < 0.18
+nose >= 1.3.1, < 1.4