update

package.json

@@ -5,18 +5,18 @@
   "license": "MIT",
   "private": true,
   "dependencies": {
-    "@material-ui/core": "^4.2.0",
-    "@material-ui/icons": "^4.2.1",
-    "@material-ui/styles": "^4.2.0",
-    "@mdx-js/loader": "^1.0.21",
-    "@next/mdx": "^9.0.0",
-    "next": "^9.0.0",
-    "react": "^16.8.6",
-    "react-dom": "^16.8.6"
+    "@material-ui/core": "~4",
+    "@material-ui/icons": "~4",
+    "@material-ui/styles": "~4",
+    "@mdx-js/loader": "~1",
+    "@next/mdx": "~9",
+    "next": "~9",
+    "react": "~16",
+    "react-dom": "~16"
   },
   "devDependencies": {
-    "@types/node": "^12.6.1",
-    "typescript": "^3.5.3"
+    "@types/node": "~12",
+    "typescript": "~3.7"
   },
   "scripts": {
     "dev": "next"