diff --git a/pyproject.toml b/pyproject.toml
index dc562d3..c5e5fd4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 ]
 dependencies = [
     "referencing",
-    "jsonschema[format-nongpl,format_nongpl]>=4.18.0",
+    "jsonschema[format-nongpl]>=4.18.0",
     "python-json-logger>=2.0.4",
     "pyyaml>=5.3",
     "traitlets>=5.3",