Update devDependencies

package.json

@@ -17,10 +17,10 @@
   },
   "devDependencies": {
     "@types/jest": "^25.2.1",
-    "beachball": "^2.0.0",
+    "beachball": "~2.31.0",
     "jest": "^25.5.3",
     "ts-jest": "^25.4.0",
-    "typescript": "^3.8.3"
+    "typescript": "~3.8.3"
   },
   "beachball": {
     "ignorePatterns": [

tsconfig.json

@@ -9,7 +9,8 @@
     "lib": ["ES2017"],
     "outDir": "lib",
     "noUnusedLocals": true,
-    "strict": true
+    "strict": true,
+    "types": ["jest"]
   },
   "include": ["src"]
 }