diff --git a/requirements.txt b/requirements.txt
index 8c091a0..ecf1abb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ Pygments==2.2.0
 pyparsing==2.2.0
 pytest==3.5.1
 pytz==2018.4
-PyYAML==3.12
+PyYAML==5.4
 recommonmark==0.4.0
 requests==2.18.4
 rinoh-typeface-dejavuserif==0.1.1
diff --git a/setup.py b/setup.py
index 858baf9..5dfb23c 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,7 @@
         "pycparser==2.18",
         "pyflakes==1.6.0",
         "pytest==3.4.1",
-        "PyYAML==3.12",
+        "PyYAML==5.4",
         "six==1.11.0",
         "tox==2.9.1",
         "typed-ast==1.1.0",