diff --git a/pyproject.toml b/pyproject.toml
index 97370ef5..89f2695a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,7 +49,6 @@ python = ">=3.9,<3.11"
 numpy = "^1.24.2"
 scipy = "^1.10.1"
 matplotlib = "^3.7.0"
-nbsphinx = "^0.9.3"
 
 [tool.poetry.group.test.dependencies]
 pytest = "^7.2.1"