diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43ea14c..48a85d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.66.1] - 2023-12-20
+
+### Added
+
+- Added custom property in activate()
+
 ## [1.66.0] - 2023-11-22
 
 ### Fixed
diff --git a/tests/events/test_impression_util.py b/tests/events/test_impression_util.py
index b079216..688bf73 100644
--- a/tests/events/test_impression_util.py
+++ b/tests/events/test_impression_util.py
@@ -122,6 +122,39 @@ def test_create_track_user_events_impression(self):
 
             self.assertDictEqual(result, expected)
 
+    def test_create_track_user_events_impression_custom_property(self):
+        with mock.patch("vwo.helpers.generic_util.get_random_number", return_value="0.123456789"), mock.patch(
+            "vwo.helpers.generic_util.get_current_unix_timestamp", return_value="123456789"
+        ), mock.patch("vwo.helpers.generic_util.get_current_unix_timestamp_milli", return_value="123456789000"):
+
+            expected = {
+                "d": {
+                    "msgId": uuid_util.generate_for(TEST_USER_ID, TEST_ACCOUNT_ID)
+                    + "-"
+                    + str(generic_util.get_current_unix_timestamp_milli()),
+                    "visId": uuid_util.generate_for(TEST_USER_ID, TEST_ACCOUNT_ID),
+                    "sessionId": generic_util.get_current_unix_timestamp(),
+                    "event": {
+                        "props": {
+                            "id": 1,
+                            "variation": 1,
+                            "isFirst": 1,
+                            "vwo_sdkName": constants.SDK_NAME,
+                            "vwo_sdkVersion": constants.SDK_VERSION,
+                            "vwo_envKey": self.settings_file.get("sdkKey"),
+                            "vwoMeta": { "textProperty": "python"}
+                        },
+                        "name": constants.EVENTS.VWO_VARIATION_SHOWN,
+                        "time": generic_util.get_current_unix_timestamp_milli(),
+                    },
+                    "visitor": {"props": {"vwo_fs_environment": self.settings_file.get("sdkKey")}},
+                }
+            }
+
+            result = impression_util.create_track_user_events_impression(self.settings_file, 1, 1, TEST_USER_ID, custom_properties={'textProperty': 'python'})
+
+            self.assertDictEqual(result, expected)
+
     def test_create_track_goal_events_impression_without_revenue(self):
 
         with mock.patch("vwo.helpers.generic_util.get_random_number", return_value="0.123456789"), mock.patch(
diff --git a/vwo/api/activate.py b/vwo/api/activate.py
index d5943aa..22cc6f9 100644
--- a/vwo/api/activate.py
+++ b/vwo/api/activate.py
@@ -61,6 +61,7 @@ def _activate(vwo_instance, campaign_key, user_id, **kwargs):
     variation_targeting_variables = kwargs.get("variation_targeting_variables")
     user_agent = kwargs.get("user_agent")
     user_ip_address = kwargs.get("user_ip_address")
+    custom_properties = kwargs.get("custom_properties")    # to support custom properties in variationShown
 
     # Validate input parameters
     if (
@@ -150,7 +151,7 @@ def _activate(vwo_instance, campaign_key, user_id, **kwargs):
                 user_ip_address=user_ip_address,
             )
             impression = impression_util.create_track_user_events_impression(
-                vwo_instance.settings_file, campaign.get("id"), variation.get("id"), user_id
+                vwo_instance.settings_file, campaign.get("id"), variation.get("id"), user_id, custom_properties
             )
             vwo_instance.event_dispatcher.dispatch_events(params=params, impression=impression)
 
diff --git a/vwo/api/is_feature_enabled.py b/vwo/api/is_feature_enabled.py
index 908ede4..fb2e25e 100644
--- a/vwo/api/is_feature_enabled.py
+++ b/vwo/api/is_feature_enabled.py
@@ -63,6 +63,7 @@ def _is_feature_enabled(vwo_instance, campaign_key, user_id, **kwargs):
     variation_targeting_variables = kwargs.get("variation_targeting_variables")
     user_agent = kwargs.get("user_agent")
     user_ip_address = kwargs.get("user_ip_address")
+    custom_properties = kwargs.get("custom_properties")    # to support custom properties in variationShown
 
     if (
         not validate_util.is_valid_string(campaign_key)
@@ -149,7 +150,7 @@ def _is_feature_enabled(vwo_instance, campaign_key, user_id, **kwargs):
                 user_ip_address=user_ip_address,
             )
             impression = impression_util.create_track_user_events_impression(
-                vwo_instance.settings_file, campaign.get("id"), variation.get("id"), user_id
+                vwo_instance.settings_file, campaign.get("id"), variation.get("id"), user_id, custom_properties
             )
             vwo_instance.event_dispatcher.dispatch_events(params=params, impression=impression)
     else:
diff --git a/vwo/helpers/impression_util.py b/vwo/helpers/impression_util.py
index 07bb969..d016cff 100644
--- a/vwo/helpers/impression_util.py
+++ b/vwo/helpers/impression_util.py
@@ -170,7 +170,7 @@ def get_stringified_log_impression(impression):
     return json.dumps(log_impression)
 
 
-def create_track_user_events_impression(settings_file, campaign_id, variation_id, user_id):
+def create_track_user_events_impression(settings_file, campaign_id, variation_id, user_id, custom_properties=None):
     """Creates the event impression for track user call from the arguments passed accordingly
 
     Args:
@@ -188,6 +188,8 @@ def create_track_user_events_impression(settings_file, campaign_id, variation_id
 
     # impression["d"]["event"]["props"].update(UsageStats.get_usage_stats())
     impression["d"]["event"]["props"].update({"id": campaign_id, "variation": variation_id, "isFirst": 1})
+    if custom_properties is not None:
+        impression["d"]["event"]["props"].update({"vwoMeta": custom_properties})
 
     logger.log(
         LogLevelEnum.DEBUG,