diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f6765b75..9dacab766 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
   - Open MPI: openmpi40-aws-4.1.7-2 and openmpi50-aws-5.0.8-11
 
 **BUG FIXES**
+- Fix incorrect timestamp parsing for chef-client.log in CloudWatch Agent configuration.
 - Prevent cluster readiness check failures due to instances launched while the check is in progress.
 - Fix race condition where compute nodes could deploy the wrong cluster config version after an update failure.
 
diff --git a/cookbooks/aws-parallelcluster-environment/files/cloudwatch/cloudwatch_agent_config.json b/cookbooks/aws-parallelcluster-environment/files/cloudwatch/cloudwatch_agent_config.json
index 95ceb287a..08e610745 100644
--- a/cookbooks/aws-parallelcluster-environment/files/cloudwatch/cloudwatch_agent_config.json
+++ b/cookbooks/aws-parallelcluster-environment/files/cloudwatch/cloudwatch_agent_config.json
@@ -4,6 +4,7 @@
     "default": "%Y-%m-%d %H:%M:%S,%f",
     "bracket_default": "[%Y-%m-%d %H:%M:%S]",
     "slurm": "%Y-%m-%dT%H:%M:%S.%f",
+    "chef": "[%Y-%m-%dT%H:%M:%S",
     "json": ""
   },
   "log_configs": [
@@ -82,7 +83,7 @@
       "feature_conditions": []
     },
     {
-      "timestamp_format_key": "default",
+      "timestamp_format_key": "chef",
       "file_path": "/var/log/chef-client.log",
       "log_stream_name": "chef-client",
       "schedulers": [