diff --git a/dev-requirements.txt b/dev-requirements.txt
index 71c2a73..0d2f49d 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -8,6 +8,6 @@ pysam
 requests 
 coverage 
 pyfasta 
-pyvcf 
+pyvcf3
 numpy 
 biopython