diff --git a/requirements.txt b/requirements.txt
index 974bc51e55141c61ddc33b6b14db4f5710df752c..e83c0bc7d2dee149476b6b724a84ca499ec82010 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Sphinx==1.2.3
 Werkzeug==0.9.6
 alembic==0.8.3
 backtranslate==0.0.5
-biopython==1.64
+biopython==1.66
 chardet==2.3.0
 cssselect==0.9.1
 description-extractor==2.2.1