diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index eef13cf..0492936 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.3.1
+current_version = 0.4.0
 commit = True
 tag = False
 
diff --git a/.llm/log.jsonl b/.llm/log.jsonl
index f488b80..1e81c4f 100644
--- a/.llm/log.jsonl
+++ b/.llm/log.jsonl
@@ -1,2 +1,3 @@
 {"timestamp":"2026-02-24T11:30:00Z","session_start":"2026-02-23T00:00:00Z","project_name":"nshm-hazard-graphql-api","project_root":"nshm-hazard-graphql-api","model":"glm-5:cloud","tool":"opencode","duration_min":90,"tokens_in":85000,"tokens_out":25000,"commits":["5057d4c"],"files":{"read":["nshm_hazard_graphql_api/schema/toshi_hazard/gridded_hazard.py","tests/conftest.py","tests/test_gridded_hazard.py","tests/test_gridded_hazard_with_nulls.py","tests/test_gridded_hazard_fix_issue_79.py","tests/test_gridded_hazard_helpers.py","tests/test_hazard_curve_migration.py"],"created":["tests/fixtures/gridded_hazard/DS/"],"modified":["nshm_hazard_graphql_api/schema/toshi_hazard/gridded_hazard.py","tests/conftest.py","tests/test_gridded_hazard.py","tests/test_gridded_hazard_with_nulls.py","tests/test_gridded_hazard_fix_issue_79.py","tests/test_gridded_hazard_helpers.py","tests/test_hazard_curve_migration.py"]},"summary":"Update gridded_hazard for THS 1.4.0: replaced deprecated get_one_gridded_hazard with get_gridded_hazard, updated model attributes (aggr, accel_levels), refactored tests from unittest to pytest style with parquet fixtures","user_notes":"new THS library version"}
 {"timestamp":"2026-02-25T21:04:56Z","session_start":"2026-02-25T20:22:11Z","project_name":"nshm-hazard-graphql-api","project_root":"nshm-hazard-graphql-api","model":"claude-sonnet-4-6","tool":"opencode","duration_min":43,"tokens_in":0,"tokens_out":0,"commits":["732d6d5","67fb25a","bda10e9"],"files":{"read":["package.json","serverless.yml","pyproject.toml",".env",".env.tests","DEVELOPMENT.md","setup.cfg"],"created":["CLAUDE.md",".yarnrc.yml"],"modified":["DEVELOPMENT.md","serverless.yml",".env.tests","setup.cfg"]},"summary":"Fixed Yarn Berry PnP issue for serverless-wsgi local dev; corrected THS env var names (DATASET_AGGR_ENABLED->THS_DATASET_AGGR_ENABLED); added THS_DATASET_GRIDDED_URI; updated DEVELOPMENT.md with full config reference; removed redundant tox build env","user_notes":"fix env variable, and docs, and remove redundant tox step (build). Tested with graphql locally."}
+{"timestamp":"2026-03-02T00:15:00Z","session_start":"2026-03-02T00:00:00Z","project_name":"nshm-hazard-graphql-api","project_root":"nshm-hazard-graphql-api","model":"claude-sonnet-4","tool":"claude-code","duration_min":15,"tokens_in":8500,"tokens_out":1800,"commits":[],"files":{"read":["CHANGELOG.md",".llm/.session"],"created":[],"modified":["CHANGELOG.md"]},"summary":"Updated CHANGELOG.md with version 0.4.0 entry for THS 1.4.2 upgrade and configuration changes","user_notes":"complete missing changelog, memory config"}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 259b914..549f557 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Changelog
 
+## [0.4.0] - 2026-03-02
+
+### Changed
+- Update to toshi-hazard-store 1.4.2 with new gridded API (replaces deprecated get_one_gridded_hazard)
+- Rename DATASET_AGGR_* env vars to THS_DATASET_AGGR_* for consistency
+- Add THS_DATASET_GRIDDED_URI configuration
+- Refactor tests from unittest to pytest with parquet fixtures
+- Remove mock-based testing in favor of fixture data
+
+### Added
+- .yarnrc.yml with node-modules linker (fixes serverless-wsgi local dev)
+- CLAUDE.md for AI assistant context
+- LLM session logging to .llm/log.jsonl
+
+### Removed
+- tox build environment (not needed for serverless deployment)
+- test_gridded_hazard_moto.py (no longer needed)
+
 ## [0.3.1] - 2025-11-25
 
 ### Changed
diff --git a/nshm_hazard_graphql_api/__init__.py b/nshm_hazard_graphql_api/__init__.py
index 485aca0..8bf3fed 100644
--- a/nshm_hazard_graphql_api/__init__.py
+++ b/nshm_hazard_graphql_api/__init__.py
@@ -2,4 +2,4 @@
 
 __author__ = """GNS Science New Zealand"""
 __email__ = 'nshm@gns.cri.nz'
-__version__ = '0.3.1'
+__version__ = '0.4.0'
diff --git a/package.json b/package.json
index 9e92671..a712a42 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nshm-hazard-graphql-api",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "A graphql API for NSHM hazard.",
   "scripts": {
     "sls_requirements_1": "serverless requirements clean",
diff --git a/pyproject.toml b/pyproject.toml
index 624fb4c..84ac9ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "nshm-hazard-graphql-api"
-version = "0.3.1"
+version = "0.4.0"
 homepage = "https://github.com/gns-science/nshm-hazard-graphql-api"
 description = "A Grapql API for NZHSM Hazard.."
 authors = [
diff --git a/serverless.yml b/serverless.yml
index b874920..e05133e 100644
--- a/serverless.yml
+++ b/serverless.yml
@@ -175,7 +175,7 @@ functions:
         - '/lambda-entrypoint.sh'
 
     description: The graphql API of ${self:service}
-    memorySize: 4096 # optional, in MB, default is 1024
+    memorySize: 3008 # was previously 4096, but not currently supported (why not)
     timeout: 20 # optional, in seconds, default is 6
     events:
       - http: