diff --git a/requirements.txt b/requirements.txt
index 2e145a8f..6a7a446f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,5 @@ matplotlib==2.0.2
 Pillow
 flask
 scipy==0.19.0
-lws
 tqdm
 git+git://github.com/bootphon/phonemizer@master