diff --git a/package.json b/package.json
index d89d7fd..dabe4e7 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
         "nyc": "^15.1.0",
         "q": "^1.5.1",
         "rimraf": "^5.0.5",
-        "sinon": "^17.0.1",
+        "sinon": "^12.0.0",
         "source-map-support": "^0.5.21",
         "ts-node": "^10.9.2",
         "typescript": "^5.4.3"
diff --git a/src/Logger.spec.ts b/src/Logger.spec.ts
index 8aff42e..e34a7ee 100644
--- a/src/Logger.spec.ts
+++ b/src/Logger.spec.ts
@@ -1,5 +1,6 @@
 import { expect } from 'chai';
 import { Logger, LogLevel, noop } from './Logger';
+import chalk from 'chalk';
 import { createSandbox } from 'sinon';
 const sinon = createSandbox();
 
@@ -9,6 +10,8 @@ describe('Logger', () => {
     beforeEach(() => {
         logger = new Logger(LogLevel.trace);
         sinon.restore();
+        //disable chalk colors for testing
+        sinon.stub(chalk, 'grey').callsFake((arg) => arg as any);
     });
 
     it('noop does nothing', () => {