diff --git a/python-nbconvert.spec b/python-nbconvert.spec
index 3f23642..91b8ab8 100644
--- a/python-nbconvert.spec
+++ b/python-nbconvert.spec
@@ -42,6 +42,7 @@ Requires:       python-defusedxml
 Requires:       python-entrypoints >= 0.2.2
 Requires:       python-jupyter-client >= 5.3.1
 Requires:       python-jupyter-core
+Requires:       python-jupyterlab-pygments
 Requires:       python-mistune >= 0.7.4
 Requires:       python-nbformat >= 4.4
 Requires:       python-pandocfilters >= 1.4.1