diff --git a/packages/uipath-platform/pyproject.toml b/packages/uipath-platform/pyproject.toml
index 091bd2284..be322ea1e 100644
--- a/packages/uipath-platform/pyproject.toml
+++ b/packages/uipath-platform/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "uipath-platform"
-version = "0.2.34"
+version = "0.2.35"
 description = "HTTP client library for programmatic access to UiPath Platform"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.11"
diff --git a/packages/uipath-platform/src/uipath/platform/connections/_connections_service.py b/packages/uipath-platform/src/uipath/platform/connections/_connections_service.py
index b7c1e9444..3e6aee31c 100644
--- a/packages/uipath-platform/src/uipath/platform/connections/_connections_service.py
+++ b/packages/uipath-platform/src/uipath/platform/connections/_connections_service.py
@@ -32,6 +32,13 @@
 _ORIGINATOR_VALUE = "uipath-python"
 
 
+def _to_param_str(value: Any) -> str:
+    """Convert an activity parameter value to its wire string; booleans become lowercase."""
+    if isinstance(value, bool):
+        return "true" if value else "false"
+    return value if isinstance(value, str) else str(value)
+
+
 class ConnectionsService(BaseService):
     """Service for managing UiPath external service connections.
 
@@ -754,7 +761,7 @@ def _build_activity_request_spec(
             if value is None:
                 continue
 
-            value_str = str(value) if not isinstance(value, str) else value
+            value_str = _to_param_str(value)
 
             if param_name in activity_metadata.parameter_location_info.query_params:
                 query_params[param_name] = value_str
@@ -812,7 +819,7 @@ def _build_activity_request_spec(
                     # Scalar (string/number/etc.) — send as a plain multipart
                     # form field, not a file part. The (None, value) shape tells
                     # httpx to omit `filename=...` from the Content-Disposition.
-                    files[key] = (None, str(val))
+                    files[key] = (None, _to_param_str(val))
 
             files[json_section] = (
                 "",
diff --git a/packages/uipath-platform/tests/services/test_connections_service.py b/packages/uipath-platform/tests/services/test_connections_service.py
index af74984b8..c9fa45441 100644
--- a/packages/uipath-platform/tests/services/test_connections_service.py
+++ b/packages/uipath-platform/tests/services/test_connections_service.py
@@ -1560,6 +1560,65 @@ def test_invoke_activity_with_path_parameters(
             "/elements_/v3/element/instances/test-connection-123/elements/test-connector/users/user456/posts/post789"
         )
 
+    def test_invoke_activity_bool_query_and_header_params_are_lowercase(
+        self,
+        httpx_mock: HTTPXMock,
+        service: ConnectionsService,
+        simple_activity_metadata: ActivityMetadata,
+    ) -> None:
+        """Test that booleans are sent as true/false, not Python's True/False."""
+        connection_id = "test-connection-123"
+        activity_input = {
+            "query_param": True,
+            "query_param2": False,
+            "custom_header": True,
+            "custom_header2": 3,
+        }
+
+        httpx_mock.add_response(
+            method="GET",
+            status_code=200,
+            json={"id": connection_id, "name": "Test", "elementInstanceId": 1},
+        )
+        httpx_mock.add_response(method="POST", status_code=200, json={})
+
+        service.invoke_activity(
+            activity_metadata=simple_activity_metadata,
+            connection_id=connection_id,
+            activity_input=activity_input,
+        )
+
+        sent_request = httpx_mock.get_requests()[1]
+        assert sent_request.url.params["query_param"] == "true"
+        assert sent_request.url.params["query_param2"] == "false"
+        assert sent_request.headers["custom_header"] == "true"
+        assert sent_request.headers["custom_header2"] == "3"
+
+    def test_invoke_activity_bool_path_param_is_lowercase(
+        self,
+        httpx_mock: HTTPXMock,
+        service: ConnectionsService,
+        path_activity_metadata: ActivityMetadata,
+    ) -> None:
+        """Test that a boolean path parameter is substituted as false, not False."""
+        connection_id = "test-connection-123"
+
+        httpx_mock.add_response(
+            method="GET",
+            status_code=200,
+            json={"id": connection_id, "name": "Test", "elementInstanceId": 1},
+        )
+        httpx_mock.add_response(method="POST", status_code=200, json={})
+
+        service.invoke_activity(
+            activity_metadata=path_activity_metadata,
+            connection_id=connection_id,
+            activity_input={"userId": False, "postId": 7},
+        )
+
+        sent_request = httpx_mock.get_requests()[1]
+        assert sent_request.url.path.endswith("/users/false/posts/7")
+
     def test_invoke_activity_multipart_request(
         self,
         httpx_mock: HTTPXMock,
@@ -2343,3 +2402,39 @@ def test_invoke_activity_multipart_scalar_is_plain_form_field(
         # Scalar payload must NOT carry a filename in Content-Disposition.
         assert "filename=" not in payload_part
         assert "{}" in payload_part
+
+    def test_invoke_activity_multipart_bool_scalar_is_lowercase(
+        self,
+        httpx_mock: HTTPXMock,
+        service: ConnectionsService,
+    ) -> None:
+        """Boolean multipart form fields are sent as true/false, not True/False."""
+        metadata = ActivityMetadata(
+            object_path="/elements/test-connector/upload",
+            method_name="POST",
+            content_type="multipart/form-data",
+            parameter_location_info=ActivityParameterLocationInfo(
+                multipart_params=["flag"],
+                body_fields=[],
+            ),
+        )
+        connection_id = "test-connection-123"
+
+        httpx_mock.add_response(
+            method="GET",
+            status_code=200,
+            json={"id": connection_id, "name": "Test", "elementInstanceId": 1},
+        )
+        httpx_mock.add_response(method="POST", status_code=200, json={"ok": True})
+
+        service.invoke_activity(
+            activity_metadata=metadata,
+            connection_id=connection_id,
+            activity_input={"flag": True},
+        )
+
+        sent_request = httpx_mock.get_requests()[1]
+        boundary = sent_request.headers["content-type"].split("boundary=")[1]
+        flag_part = _multipart_part(sent_request.content, boundary, "flag")
+
+        assert flag_part.rstrip().endswith("true")
diff --git a/packages/uipath-platform/uv.lock b/packages/uipath-platform/uv.lock
index 8d7cccdcc..b02fd2c40 100644
--- a/packages/uipath-platform/uv.lock
+++ b/packages/uipath-platform/uv.lock
@@ -1095,7 +1095,7 @@ dev = [
 
 [[package]]
 name = "uipath-platform"
-version = "0.2.34"
+version = "0.2.35"
 source = { editable = "." }
 dependencies = [
     { name = "anyio" },
diff --git a/packages/uipath/uv.lock b/packages/uipath/uv.lock
index eb6d18ede..9887fc03a 100644
--- a/packages/uipath/uv.lock
+++ b/packages/uipath/uv.lock
@@ -2762,7 +2762,7 @@ wheels = [
 
 [[package]]
 name = "uipath-platform"
-version = "0.2.34"
+version = "0.2.35"
 source = { editable = "../uipath-platform" }
 dependencies = [
     { name = "anyio" },