diff --git a/requirements.txt b/requirements.txt
index db4e933..b1a4eae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,6 @@
 chardet==3.0.4
 cmp-version==3.0.0
 docopt==0.6.2
-parver
+parver==0.1.1
 semantic-version
 versio