diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7c36fd9..f84c057 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,7 +54,7 @@ jobs:
           # Docker engine is no longer available because of licensing
           # Alternative Colima is part of the github macOS runner
           # SAM v1.47.0+ needed for colima support, unable to use Python 3.6
-          colima start
+          colima start --arch x86_64
           # Ensure colima is configured for later user
           echo "DOCKER_HOST=unix://$HOME/.colima/default/docker.sock" >> $GITHUB_ENV
           # Verify Docker
diff --git a/tests/lib/log-delivery.test.ts b/tests/lib/log-delivery.test.ts
index fd0a73b..1b32144 100644
--- a/tests/lib/log-delivery.test.ts
+++ b/tests/lib/log-delivery.test.ts
@@ -1271,11 +1271,11 @@ describe('when delivering logs', () => {
             loggerProxy.addLogPublisher(s3Logger);
 
             loggerProxy.log('count: [%d]', 5.12);
-            loggerProxy.log('timestamp: [%s]', new Date('2020-01-01'));
+            loggerProxy.log('timestamp: [%s]', new Date('2020-01-01').toISOString());
 
-            loggerProxy.log('timestamp: [%s]', new Date('2020-01-02'));
-            loggerProxy.log('timestamp: [%s]', new Date('2020-01-03'));
-            loggerProxy.log('timestamp: [%s]', new Date('2020-01-04'));
+            loggerProxy.log('timestamp: [%s]', new Date('2020-01-02').toISOString());
+            loggerProxy.log('timestamp: [%s]', new Date('2020-01-03').toISOString());
+            loggerProxy.log('timestamp: [%s]', new Date('2020-01-04').toISOString());
             expect(inspect.defaultOptions.depth).toBe(8);
             await loggerProxy.waitCompletion();