diff --git a/package.json b/package.json
index addc3a9e..ae482bb2 100755
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "@swc/jest": "^0.2.37",
     "@testing-library/react": "^16.1.0",
     "@types/jest": "^30.0.0",
-    "@types/leaflet": "^1.9.15",
+    "@types/leaflet": "^1.9.18",
     "@types/warning": "^3.0.0",
     "del-cli": "^6.0.0",
     "jest": "^30.0.2",
diff --git a/packages/react-leaflet/package.json b/packages/react-leaflet/package.json
index 731e0928..25eee831 100755
--- a/packages/react-leaflet/package.json
+++ b/packages/react-leaflet/package.json
@@ -52,7 +52,7 @@
   "devDependencies": {
     "@react-leaflet/test-environment": "workspace:*",
     "@types/geojson": "^7946.0.15",
-    "@types/leaflet": "^1.9.15",
+    "@types/leaflet": "^1.9.18",
     "@types/react": "^19.1.8",
     "@types/react-dom": "^19.1.6"
   },
diff --git a/packages/react-leaflet/src/MapContainer.tsx b/packages/react-leaflet/src/MapContainer.tsx
index 395aa51d..ea15f83d 100755
--- a/packages/react-leaflet/src/MapContainer.tsx
+++ b/packages/react-leaflet/src/MapContainer.tsx
@@ -31,7 +31,7 @@ export interface MapContainerProps extends MapOptions {
   id?: string
   placeholder?: ReactNode
   style?: CSSProperties
-  whenReady?: () => void
+  whenReady?: (event: { target: LeafletMap }) => void
 }
 
 function MapContainerComponent<
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e7615b74..f1f7ed38 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -30,7 +30,7 @@ importers:
         specifier: ^30.0.0
         version: 30.0.0
       '@types/leaflet':
-        specifier: ^1.9.15
+        specifier: ^1.9.18
         version: 1.9.18
       '@types/warning':
         specifier: ^3.0.0
@@ -129,7 +129,7 @@ importers:
         specifier: ^7946.0.15
         version: 7946.0.16
       '@types/leaflet':
-        specifier: ^1.9.15
+        specifier: ^1.9.18
         version: 1.9.18
       '@types/react':
         specifier: ^19.1.8