diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index a13afdac..88948f35 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.399.0"
+  ".": "0.400.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index ea9c085b..94f44024 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 229
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-cfdb6b2516039e7537ec6edb67df5581e3f08396a9f92579dd42c565015583e6.yml
-openapi_spec_hash: c41230e467198f4240e80c77ef8c5c7c
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-a66f039751a4ffdebbbf533f24f55cd2c42708b9cf105512849849fddaafb5e8.yml
+openapi_spec_hash: c265609bceb053f898ea14b1191fe927
 config_hash: ca1425272e17fa23d4466d33492334fa
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c85c3f5c..6305313d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.400.0 (2025-11-24)
+
+Full Changelog: [v0.399.0...v0.400.0](https://github.com/Increase/increase-python/compare/v0.399.0...v0.400.0)
+
+### Features
+
+* **api:** api update ([ef8c92f](https://github.com/Increase/increase-python/commit/ef8c92f7aa7a9e5078198e8db712742139323a53))
+
+
+### Chores
+
+* add Python 3.14 classifier and testing ([4960e57](https://github.com/Increase/increase-python/commit/4960e57589600e7b8b1f4f9eed59500d2b3bf444))
+
 ## 0.399.0 (2025-11-21)
 
 Full Changelog: [v0.398.0...v0.399.0](https://github.com/Increase/increase-python/compare/v0.398.0...v0.399.0)
diff --git a/pyproject.toml b/pyproject.toml
index c031900f..b0a15666 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "increase"
-version = "0.399.0"
+version = "0.400.0"
 description = "The official Python library for the increase API"
 dynamic = ["readme"]
 license = "Apache-2.0"
@@ -24,6 +24,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Operating System :: OS Independent",
   "Operating System :: POSIX",
   "Operating System :: MacOS",
diff --git a/src/increase/_version.py b/src/increase/_version.py
index f2b74cd4..91aeef79 100644
--- a/src/increase/_version.py
+++ b/src/increase/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "increase"
-__version__ = "0.399.0"  # x-release-please-version
+__version__ = "0.400.0"  # x-release-please-version
diff --git a/src/increase/types/real_time_decision.py b/src/increase/types/real_time_decision.py
index ff389765..3de77429 100644
--- a/src/increase/types/real_time_decision.py
+++ b/src/increase/types/real_time_decision.py
@@ -275,8 +275,29 @@ class CardAuthorizationAdditionalAmounts(BaseModel):
 
 
 class CardAuthorizationDecline(BaseModel):
-    reason: str
-    """The reason the authorization was declined."""
+    reason: Literal[
+        "insufficient_funds",
+        "transaction_never_allowed",
+        "exceeds_approval_limit",
+        "card_temporarily_disabled",
+        "suspected_fraud",
+        "other",
+    ]
+    """The reason the authorization was declined.
+
+    - `insufficient_funds` - The cardholder does not have sufficient funds to cover
+      the transaction. The merchant may attempt to process the transaction again.
+    - `transaction_never_allowed` - This type of transaction is not allowed for this
+      card. This transaction should not be retried.
+    - `exceeds_approval_limit` - The transaction amount exceeds the cardholder's
+      approval limit. The merchant may attempt to process the transaction again.
+    - `card_temporarily_disabled` - The card has been temporarily disabled or not
+      yet activated. The merchant may attempt to process the transaction again.
+    - `suspected_fraud` - The transaction is suspected to be fraudulent. The
+      merchant may attempt to process the transaction again.
+    - `other` - The transaction was declined for another reason. The merchant may
+      attempt to process the transaction again. This should be used sparingly.
+    """
 
 
 class CardAuthorizationNetworkDetailsPulse(BaseModel):