diff --git a/var/spack/repos/builtin/packages/py-rsa/package.py b/var/spack/repos/builtin/packages/py-rsa/package.py
index b3d9cb7a37515d256e558587f2beba4a519776cf..85e2b84d00c48c76ebe1ccc7c581c5f7aa923fc2 100644
--- a/var/spack/repos/builtin/packages/py-rsa/package.py
+++ b/var/spack/repos/builtin/packages/py-rsa/package.py
@@ -14,6 +14,7 @@ class PyRsa(PythonPackage):
 
     import_modules = ['rsa']
 
+    version('4.0',   sha256='1a836406405730121ae9823e19c6e806c62bbad73f890574fff50efa4122c487')
     version('3.4.2', sha256='25df4e10c263fb88b5ace923dd84bf9aa7f5019687b5e55382ffcdb8bede9db5')
 
     depends_on('py-setuptools', type=('build', 'run'))