diff --git a/requirements.txt b/requirements.txt
index e68050b..ef96d92 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Keras-Preprocessing==1.0.1
 Markdown==2.6.11
 numpy==1.14.5
 protobuf==3.6.0
-PyYAML==3.13
+PyYAML
 scipy==1.1.0
 six==1.11.0
 tensorboard==1.9.0