diff --git a/requirements.txt b/requirements.txt
index 22184b9..66609cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
-nose
-pyvcf
-pandas
-coloredlogs
+nose==1.3.7
+pyvcf==0.6.8
+pandas==0.16.2
+coloredlogs==5.2
+codecov==2.0.5
+coverage==4.3.4