diff --git a/python-nbsphinx.spec b/python-nbsphinx.spec
index 1795a2a..7fb5300 100644
--- a/python-nbsphinx.spec
+++ b/python-nbsphinx.spec
@@ -3,7 +3,7 @@
 
 Name:           python-%{pypi_name}
 Version:        0.4.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Jupyter Notebook Tools for Sphinx
 
 License:        MIT
@@ -36,6 +36,9 @@ executed during the Sphinx build process.
 Summary:        %{summary}
 %{?python_provide:%python_provide python3-%{pypi_name}}
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=1680237#c1
+Requires:       python3.7dist(nbconvert)
+
 %description -n python3-%{pypi_name}
 nbsphinx is a Sphinx extension that provides a source parser for *.ipynb
 files. Custom Sphinx directives are used to show Jupyter Notebook code cells
@@ -77,6 +80,9 @@ rm -rf html/{.doctrees,.buildinfo,conf.py}
 %doc html 
 
 %changelog
+* Thu Feb 28 2019 Miro Hrončok <mhroncok@redhat.com> - 0.4.2-2
+- Explicitly require nbconvert
+
 * Wed Feb 27 2019 Miro Hrončok <mhroncok@redhat.com> - 0.4.2-1
 - Update to 0.4.2 (#1680237)