diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8f3e0a49..b4e9013b 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.15.0"
+  ".": "0.16.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 2b935dca..5e987cb7 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 40
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/sent%2Fsent-dm-aa5788f722a5500abb87ae7d7dd559e5802d3f45abbc525d105ca1010f553070.yml
-openapi_spec_hash: e122ccb2f2f3062194364f20fd58fee1
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/sent%2Fsent-dm-f2cbab8576dd9d0ece91116dcfe1eb190ff0a2ff9334f812d94ad6f3b3afb807.yml
+openapi_spec_hash: 1571d3e04a2b043574b91646b4062f3b
 config_hash: d8e8429147c4e214ff53c11e7ab2a1a6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68b945f4..b532606f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.16.0 (2026-03-31)
+
+Full Changelog: [v0.15.0...v0.16.0](https://github.com/sentdm/sent-dm-python/compare/v0.15.0...v0.16.0)
+
+### Features
+
+* **internal:** implement indices array format for query and form serialization ([6d6fb31](https://github.com/sentdm/sent-dm-python/commit/6d6fb31a333ad899c03d4638725454747cd06ed5))
+
 ## 0.15.0 (2026-03-25)
 
 Full Changelog: [v0.14.1...v0.15.0](https://github.com/sentdm/sent-dm-python/compare/v0.14.1...v0.15.0)
diff --git a/pyproject.toml b/pyproject.toml
index 97f5f4fe..e8686e0f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "sentdm"
-version = "0.15.0"
+version = "0.16.0"
 description = "The official Python library for the sent-dm API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/sent_dm/_qs.py b/src/sent_dm/_qs.py
index ada6fd3f..de8c99bc 100644
--- a/src/sent_dm/_qs.py
+++ b/src/sent_dm/_qs.py
@@ -101,7 +101,10 @@ def _stringify_item(
                     items.extend(self._stringify_item(key, item, opts))
                 return items
             elif array_format == "indices":
-                raise NotImplementedError("The array indices format is not supported yet")
+                items = []
+                for i, item in enumerate(value):
+                    items.extend(self._stringify_item(f"{key}[{i}]", item, opts))
+                return items
             elif array_format == "brackets":
                 items = []
                 key = key + "[]"
diff --git a/src/sent_dm/_version.py b/src/sent_dm/_version.py
index cd5e9c21..8e582942 100644
--- a/src/sent_dm/_version.py
+++ b/src/sent_dm/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "sent_dm"
-__version__ = "0.15.0"  # x-release-please-version
+__version__ = "0.16.0"  # x-release-please-version