diff --git a/.gitignore b/.gitignore
index b5e1b55..5038bd7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /jupyter_client-4.2.2.tar.gz
 /jupyter_client-4.4.0.tar.gz
 /jupyter_client-5.2.1.tar.gz
+/jupyter_client-5.2.3.tar.gz
diff --git a/python-jupyter-client.spec b/python-jupyter-client.spec
index 52c9182..5430178 100644
--- a/python-jupyter-client.spec
+++ b/python-jupyter-client.spec
@@ -3,8 +3,8 @@
 %global pypi_name_dash jupyter-client
 
 Name:           python-%{pypi_name_dash}
-Version:        5.2.1
-Release:        4%{?dist}
+Version:        5.2.3
+Release:        1%{?dist}
 Summary:        Jupyter protocol implementation and client libraries
 
 License:        BSD
@@ -81,6 +81,8 @@ Documentation of the reference implementation of the Jupyter protocol
 PYTHONPATH=build/lib/ sphinx-build-3 docs html
 # remove the sphinx-build leftovers
 rm -r html/.{doctrees,buildinfo}
+# sphinx created this; it would put 3.X bytecode to py2 package
+find build/lib/%{pypi_name} -name __pycache__ | xargs rm -rf
 
 %install
 %py2_install
@@ -88,6 +90,7 @@ rm %{buildroot}%{_bindir}/*
 
 %py3_install
 
+
 %global _docdir_fmt %{name}
 
 %files -n python2-%{pypi_name_dash}
@@ -109,6 +112,10 @@ rm %{buildroot}%{_bindir}/*
 %doc html
 
 %changelog
+* Wed Mar 14 2018 Miro Hrončok <mhroncok@redhat.com> - 5.2.3-1
+- Updated to 5.2.3 (#1538378)
+- Do not have 3.6 bytecode in 2.7 package
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 5.2.1-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 
diff --git a/sources b/sources
index aa20598..2fc85f2 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (jupyter_client-5.2.1.tar.gz) = 23e165517309caf0de85a5dd72a890467c1afc983ceaa71b7d241371fd8b1dc34919b4dea9db32bf75e157db6fc2f036152cfbd583c0743e435a0882ba18960e
+SHA512 (jupyter_client-5.2.3.tar.gz) = 89b980ecc281bc1512e1fc4ba35862cc6e541f825ee07a1382d300c8088f24611225ab415d6a7c1e4209c47a74c113ec95f863e8fb0b33c6db9eb9c3521fc0ae