diff --git a/pyproject.toml b/pyproject.toml
index d296ad6..5d516b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dependencies = [
 [project.optional-dependencies]
 docs = [
 	"docutils==0.17.1",
-	"jupyter-book>=1,<2",
+	"jupyter-book>=1,<3",
 ]
 
 [project.urls]