diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 71e95ba..d353515 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.20.0"
+  ".": "0.21.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b97f0d9..f8446ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.21.0](https://github.com/NodeJSmith/otf-api/compare/v0.20.0...v0.21.0) (2026-08-11)
+
+
+### Features
+
+* add client lifecycle management and stable auth/transport errors ([#139](https://github.com/NodeJSmith/otf-api/issues/139)) ([17e6aed](https://github.com/NodeJSmith/otf-api/commit/17e6aedf3dd6c23eee844f3425fe6f05fcdacf18))
+
 ## [0.20.0](https://github.com/NodeJSmith/otf-api/compare/v0.19.0...v0.20.0) (2026-08-07)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index a629fad..26810aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "otf-api"
-version = "0.20.0"
+version = "0.21.0"
 description = "Python OrangeTheory Fitness API Client"
 authors = [{ name = "Jessica Smith", email = "j.smith.git1@gmail.com" }]
 requires-python = ">=3.11"
diff --git a/uv.lock b/uv.lock
index c9c93dc..13939e5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -994,7 +994,7 @@ wheels = [
 
 [[package]]
 name = "otf-api"
-version = "0.20.0"
+version = "0.21.0"
 source = { editable = "." }
 dependencies = [
     { name = "attrs" },