diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d5541a..9c6acf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,19 @@
 
 All notable changes to the `sharpapi` Python SDK are documented here.
 
+## 0.4.0 — 2026-05-31
+
+### Added
+
+- `OddsLine.is_active` (bool, default `True`). `False` indicates the market is
+  suspended/closed with the price frozen — mirrors OpticOdds `locked-odds` but
+  as a queryable field. Absent on the wire is treated as `True`.
+
+### Backward compatibility
+
+- Additive optional field with a `True` default — existing code is unaffected,
+  and older API servers that omit the key parse as active.
+
 ## 0.3.2 — 2026-05-07
 
 ### Changed
diff --git a/pyproject.toml b/pyproject.toml
index 9bbdd93..338d3b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "sharpapi"
-version = "0.3.3"
+version = "0.4.0"
 description = "Official Python SDK for the SharpAPI real-time sports betting odds API"
 readme = "README.md"
 license = "MIT"
diff --git a/src/sharpapi/__init__.py b/src/sharpapi/__init__.py
index d27c2c0..2e24c0a 100644
--- a/src/sharpapi/__init__.py
+++ b/src/sharpapi/__init__.py
@@ -61,7 +61,7 @@
 )
 from .streaming import EventStream
 
-__version__ = "0.3.1"
+__version__ = "0.4.0"
 
 __all__ = [
     # Clients
diff --git a/src/sharpapi/models.py b/src/sharpapi/models.py
index 6062c35..f4ec9ef 100644
--- a/src/sharpapi/models.py
+++ b/src/sharpapi/models.py
@@ -221,6 +221,10 @@ class OddsLine(BaseModel):
     event_start_time: str | None = None
     timestamp: str | None = None
     is_live: bool = False
+    # True (default) = market open and bettable; False = market suspended/closed
+    # with the price frozen (mirrors OpticOdds locked-odds). Absent on the wire
+    # is treated as True. SHA-3803.
+    is_active: bool = True
     deep_link: str | None = None
     player_name: str | None = None
     stat_category: str | None = None