diff --git a/tn/generate_tn_pdf/requirements.txt b/tn/generate_tn_pdf/requirements.txt
index d1bd22df9..33408a415 100644
--- a/tn/generate_tn_pdf/requirements.txt
+++ b/tn/generate_tn_pdf/requirements.txt
@@ -7,7 +7,7 @@ Markdown==3.0.1
 markdown2==2.3.6
 pyparsing==2.1.10
 python-dateutil==2.3
-PyYAML==3.13
+PyYAML==5.1
 singledispatch==3.4.0.3
 six==1.11.0
 tornado==5.1.1