diff --git a/plane/models/work_items.py b/plane/models/work_items.py
index ac90d53..63c4288 100644
--- a/plane/models/work_items.py
+++ b/plane/models/work_items.py
@@ -321,6 +321,7 @@ class WorkItemComment(BaseModel):
     workspace: str | None = None
     issue: str | None = None
     actor: str | None = None
+    parent: str | None = None
 
 
 class CreateWorkItemComment(BaseModel):
@@ -333,6 +334,8 @@ class CreateWorkItemComment(BaseModel):
     access: AccessEnum | None = None
     external_source: str | None = None
     external_id: str | None = None
+    # ID of a top-level comment on the same work item to reply to.
+    parent: str | None = None
 
 
 class UpdateWorkItemComment(BaseModel):
diff --git a/pyproject.toml b/pyproject.toml
index 4183980..3992843 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "plane-sdk"
-version = "0.2.23"
+version = "0.2.24"
 description = "Python SDK for Plane API"
 readme = "README.md"
 requires-python = ">=3.10"