diff --git a/package.json b/package.json
index 5d3ecb3..226f23b 100644
--- a/package.json
+++ b/package.json
@@ -32,13 +32,13 @@
   },
   "devDependencies": {
     "@jest-runner/electron": "3.0.0",
-    "@types/jest": "^25.1.1",
+    "@types/jest": "^29.5.12",
     "electron": "9.4.0",
-    "jest": "^25.1.0",
+    "jest": "^26.4.0",
     "rimraf": "^3.0.1",
     "ts-jest": "^26.4.3",
     "tsdx": "^0.12.3",
-    "tslint": "^6.0.0",
+    "tslint": "^5.1.0",
     "tslint-microsoft-contrib": "^6.2.0",
     "tsutils": "^3.17.1",
     "typescript": "^3.7.5"
diff --git a/src/date-time-formatter.test.ts b/src/date-time-formatter.test.ts
index 4b9f4c2..ba8f328 100644
--- a/src/date-time-formatter.test.ts
+++ b/src/date-time-formatter.test.ts
@@ -29,7 +29,7 @@ const {
 describe('date-time-format-options', () => {
 
   test('uses correct version of electron', () => {
-    expect(process.versions.electron).toMatch(/8.*$/);
+    expect((process.versions as any).electron).toMatch(/9.*$/);
   });
 
   describe('functionality', () => {
@@ -457,7 +457,7 @@ describe('date-time-format-options', () => {
       }
       const end = performance.now();
       expect(result).toBe('6/28/2020 3:40 PM');
-expect(end - start).toBe(0);
+      expect(end - start).toBe(0);
       });
     });
 });
diff --git a/src/safe-datetimeformat.ts b/src/safe-datetimeformat.ts
index f05fed6..ec235cd 100644
--- a/src/safe-datetimeformat.ts
+++ b/src/safe-datetimeformat.ts
@@ -39,9 +39,9 @@ export function getVdiTimeZoneFix()  {
       return 'Etc/GMT';
     } 
     if (tz > 0) {
-      return "Etc/GMT+" + tz;
+      return 'Etc/GMT+' + tz;
     }
-    return "Etc/GMT"+ tz;
+    return 'Etc/GMT' + tz;
   }
   return 'UTC';
 }