diff --git a/pyproject.toml b/pyproject.toml
index f83ceab..eafa739 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,7 @@ test = [
 docs = [
     "sphinx",
     "sphinx-rtd-theme",
+    "sphinx-jsonschema",
 ]
 dev = [
     "splinepy[all]",
@@ -55,6 +56,7 @@ dev = [
     "pytest-cov",
     "sphinx",
     "sphinx-rtd-theme",
+    "sphinx-jsonschema",
 ]
 
 [project.scripts]