diff --git a/jupyter_events/validators.py b/jupyter_events/validators.py
index a19597b..4d46482 100644
--- a/jupyter_events/validators.py
+++ b/jupyter_events/validators.py
@@ -32,7 +32,7 @@
     EVENT_CORE_SCHEMA["$id"]: EVENT_CORE_SCHEMA,
 }
 
-METASCHEMA_REGISTRY = Registry().with_resources(
+METASCHEMA_REGISTRY = Registry().with_resources( # type:ignore
     [
         (EVENT_METASCHEMA["$id"], DRAFT7.create_resource(EVENT_METASCHEMA)),
         (PROPERTY_METASCHEMA["$id"], DRAFT7.create_resource(PROPERTY_METASCHEMA)),
diff --git a/pyproject.toml b/pyproject.toml
index 2b18305..a10bb37 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 ]
 dependencies = [
     "referencing",
-    "jsonschema[format-nongpl,format_nongpl]>=3.2.0",
+    "jsonschema[format-nongpl,format_nongpl]>=4.18.0",
     "python-json-logger>=2.0.4",
     "pyyaml>=5.3",
     "traitlets>=5.3",