diff --git a/dev-python/nbformat/nbformat-5.7.3.ebuild b/dev-python/nbformat/nbformat-5.7.3.ebuild
index 7c0641761dd1a..b6647188ffbee 100644
--- a/dev-python/nbformat/nbformat-5.7.3.ebuild
+++ b/dev-python/nbformat/nbformat-5.7.3.ebuild
@@ -35,7 +35,8 @@ BDEPEND="
 
 distutils_enable_sphinx docs \
 	dev-python/numpydoc \
-	dev-python/myst_parser
+	dev-python/myst_parser \
+	dev-python/pydata-sphinx-theme
 distutils_enable_tests pytest
 
 PATCHES=(