diff --git a/pkgs/development/python-modules/pyaml/default.nix b/pkgs/development/python-modules/pyaml/default.nix
index 1d0168b6bfa3..524d34c68d4a 100644
--- a/pkgs/development/python-modules/pyaml/default.nix
+++ b/pkgs/development/python-modules/pyaml/default.nix
@@ -7,11 +7,11 @@
 
 buildPythonPackage rec {
   pname = "pyaml";
-  version = "19.12.0";
+  version = "20.4.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "b3f636b467864319d7ded1558f86bb305b8612a274f5d443a62dc5eceb1b7176";
+    sha256 = "29a5c2a68660a799103d6949167bd6c7953d031449d08802386372de1db6ad71";
   };
 
   propagatedBuildInputs = [ pyyaml ];