diff --git a/docs/requirements.txt b/docs/requirements.txt
index f2a14e39..05dd891f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -18,7 +18,7 @@ py==1.5.2
 Pygments==2.2.0
 pyparsing==2.2.0
 pytz==2018.3
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.4
 six==1.11.0
 snowballstemmer==1.2.1