diff --git a/setup.py b/setup.py
index 1b50188..bb311b7 100644
--- a/setup.py
+++ b/setup.py
@@ -44,5 +44,5 @@
         'Topic :: Text Processing :: Markup',
     ],
 
-    install_requires=["PyYAML == 3.10", "Markdown == 2.3.1", "requests"],
+    install_requires=["PyYAML == 5.1", "Markdown == 2.3.1", "requests"],
 )