diff --git a/var/spack/repos/builtin/packages/py-gevent/package.py b/var/spack/repos/builtin/packages/py-gevent/package.py
index 9e575e5634..55189d4d73 100644
--- a/var/spack/repos/builtin/packages/py-gevent/package.py
+++ b/var/spack/repos/builtin/packages/py-gevent/package.py
@@ -12,6 +12,7 @@ class PyGevent(PythonPackage):
     homepage = "https://www.gevent.org"
     pypi = "gevent/gevent-1.3a2.tar.gz"
 
+    version('21.12.0', sha256='f48b64578c367b91fa793bf8eaaaf4995cb93c8bc45860e473bf868070ad094e')
     version('21.8.0', sha256='43e93e1a4738c922a2416baf33f0afb0a20b22d3dba886720bc037cd02a98575')
     version('1.5.0',  sha256='b2814258e3b3fb32786bb73af271ad31f51e1ac01f33b37426b66cb8491b4c29')
     version('1.3a2',  sha256='f7ab82697111ea233c7beeadf5240f669dfad9c4bbc89a3ec80a49e2c48a65bd')