diff --git a/requirements.txt b/requirements.txt
index bbd6e221196cdeb8807511cf0388d7dd95b85c25..d73e05bc1750e9c33bc15ae5fc2d97b8ecebf7a9 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 beautifulsoup4==4.5.3
 bs4==0.0.1
-PyYAML>5.1.1
+PyYAML==5.1.1
 six==1.10.0
 requests==2.18.4
 Pillow
@@ -12,4 +12,4 @@ keras>=2.2.4
 tensorflow
 matplotlib>=3.0.2
 numpy>=1.14.6
-scipy>=1.1.0
+scipy>=1.1.0
\ No newline at end of file