diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c5b74b3b..64b72ad46 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,8 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [4.2.2]
-### Changed
+## [4.3.0]
+### Added
+- An `iterative_min_size` parameter has been added to the `WATER_MAP_TEST` job spec.
+#### Changed
+- For `WATER_MAP_TEST` jobs, the default `minimization_metric` is now `ts`.
 - Use Amazon Linux 2023 AMI in non-Earthdata Cloud environments
 
 ## [4.2.1]
diff --git a/job_spec/WATER_MAP_TEST.yml b/job_spec/WATER_MAP_TEST.yml
index 7c707e0d0..a9e0c6ab2 100644
--- a/job_spec/WATER_MAP_TEST.yml
+++ b/job_spec/WATER_MAP_TEST.yml
@@ -97,10 +97,16 @@ WATER_MAP_TEST:
         description: Maximum bound used for iterative method. Ignored when flood_depth_estimator is None.
         default: 15
         type: integer
+    iterative_min_size:
+      api_schema:
+        description: Minimum size of a connected waterbody in pixels for calculating flood depths with the iterative estimator
+        default: 0
+        type: integer
+        minimum: 0
     minimization_metric:
       api_schema:
         description: Evaluation method to minimize during the iterative flood depth calculation. Options include a Fowlkes-Mallows index (fmi) or a threat score (ts). Only used when flood_depth_estimator is iterative.
-        default: fmi
+        default: ts
         type: string
         enum:
           - fmi
@@ -187,6 +193,8 @@ WATER_MAP_TEST:
         - Ref::iterative_min
         - --iterative-max
         - Ref::iterative_max
+        - --iterative-min-size
+        - Ref::iterative_min_size
         - --minimization-metric
         - Ref::minimization_metric
       timeout: 86400