diff --git a/chi2/requirements.txt b/chi2/requirements.txt
index 060dd6f..9156c8d 100644
--- a/chi2/requirements.txt
+++ b/chi2/requirements.txt
@@ -41,7 +41,7 @@ ordereddict
 
 # for chi2
 wsgiref==0.1.2
-mechanize==0.2.5
+mechanize==0.4.6
 
 # uthscsa chi2notypes driver
 docopt==0.6.2