diff --git a/docs/requirements_dev.txt b/docs/requirements_dev.txt
index 18ba94b..ea7c28c 100644
--- a/docs/requirements_dev.txt
+++ b/docs/requirements_dev.txt
@@ -8,6 +8,6 @@ coverage==4.4.2
 Sphinx==1.6.5
 twine==1.9.1
 cryptography==2.1.4
-PyYAML==3.11
+PyYAML==5.4
 sphinx-argparse==0.2.1
 
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 41ea26d..97f793a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,6 +8,6 @@ coverage==4.4.2
 Sphinx==1.6.5
 twine==1.9.1
 cryptography>=2.3
-PyYAML==3.11
+PyYAML==5.4
 sphinx-argparse==0.2.1