diff --git a/setup.cfg b/setup.cfg
index f84c1197d..bd0656a52 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -37,6 +37,7 @@ install_requires =
 [options.extras_require]
 test =
     coverage
+    nbval
     pytest>=6.0
     pytest-cov
     requests