diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 1aec2271..b84fc160 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.138.0"
+  ".": "0.139.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a10048c..5ccdac82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.139.0](https://github.com/kernel/kernel-python-sdk/compare/v0.138.0...v0.139.0) (2026-10-30)
+
+
+### Features
+
+* Expose leased_at on browser session responses ([37a09bc](https://github.com/kernel/kernel-python-sdk/commit/37a09bceae3ca0941c588ce58f3afad804096fbf))
+
 ## [0.138.0](https://github.com/kernel/kernel-python-sdk/compare/v0.137.0...v0.138.0) (2026-10-30)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 74974ceb..e196f12d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "kernel"
-version = "0.138.0"
+version = "0.139.0"
 description = "The official Python library for the kernel API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/kernel/_version.py b/src/kernel/_version.py
index 41dc1d41..7a10bcae 100644
--- a/src/kernel/_version.py
+++ b/src/kernel/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "kernel"
-__version__ = "0.138.0"  # x-release-please-version
+__version__ = "0.139.0"  # x-release-please-version
diff --git a/src/kernel/types/browser_create_response.py b/src/kernel/types/browser_create_response.py
index 53ae17de..995ebd17 100644
--- a/src/kernel/types/browser_create_response.py
+++ b/src/kernel/types/browser_create_response.py
@@ -77,6 +77,12 @@ class BrowserCreateResponse(BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""
 
diff --git a/src/kernel/types/browser_list_response.py b/src/kernel/types/browser_list_response.py
index fa6c01ba..78419bf8 100644
--- a/src/kernel/types/browser_list_response.py
+++ b/src/kernel/types/browser_list_response.py
@@ -77,6 +77,12 @@ class BrowserListResponse(BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""
 
diff --git a/src/kernel/types/browser_pool_acquire_response.py b/src/kernel/types/browser_pool_acquire_response.py
index cceb9892..5a0ce004 100644
--- a/src/kernel/types/browser_pool_acquire_response.py
+++ b/src/kernel/types/browser_pool_acquire_response.py
@@ -78,6 +78,12 @@ class BrowserPoolAcquireResponse(NoContentAsNone, BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""
 
diff --git a/src/kernel/types/browser_retrieve_response.py b/src/kernel/types/browser_retrieve_response.py
index c537589f..fc30d4f9 100644
--- a/src/kernel/types/browser_retrieve_response.py
+++ b/src/kernel/types/browser_retrieve_response.py
@@ -77,6 +77,12 @@ class BrowserRetrieveResponse(BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""
 
diff --git a/src/kernel/types/browser_update_response.py b/src/kernel/types/browser_update_response.py
index 5b9f8ae3..a88951d2 100644
--- a/src/kernel/types/browser_update_response.py
+++ b/src/kernel/types/browser_update_response.py
@@ -77,6 +77,12 @@ class BrowserUpdateResponse(BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""
 
diff --git a/src/kernel/types/invocation_list_browsers_response.py b/src/kernel/types/invocation_list_browsers_response.py
index 2df9877c..f3016e56 100644
--- a/src/kernel/types/invocation_list_browsers_response.py
+++ b/src/kernel/types/invocation_list_browsers_response.py
@@ -77,6 +77,12 @@ class Browser(BaseModel):
     kiosk_mode: Optional[bool] = None
     """Whether the browser session is running in kiosk mode."""
 
+    leased_at: Optional[datetime] = None
+    """When the pooled browser session was last leased.
+
+    Only present for leased pooled sessions.
+    """
+
     location: Optional[BrowserLocation] = None
     """Effective browser timezone and locale with per-field provenance."""