diff --git a/requirements_dev.txt b/requirements_dev.txt
index a5bd712..f39806e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -24,7 +24,7 @@ pycparser==2.18
 pyflakes==1.5.0
 Pygments==2.2.0
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.2
 six==1.10.0
 snowballstemmer==1.2.1