diff --git a/ocr_api/requirements.txt b/ocr_api/requirements.txt
index 6120e04..84be8a4 100644
--- a/ocr_api/requirements.txt
+++ b/ocr_api/requirements.txt
@@ -5,4 +5,4 @@ numpy==1.11.1
 opencv_python==3.4.0.12
 Cython==0.27.3
 Pillow==5.0.0
-PyYAML==3.12
+PyYAML==5.1