diff --git a/CHANGELOG.md b/CHANGELOG.md
index da3cf495f..4a57e79c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The changelog for `SuperwallKit`. Also see the [releases](https://github.com/sup
 
 ### Enhancements
 
+- Adds `singularDeviceId` as an `IntegrationAttribute`.
 - Adds support for annual subscriptions that are billed monthly.
 - Added `EventTrackingBehavior` enum and `SuperwallOptions.eventTrackingBehavior` property for GDPR-compliant event collection control. Use `.all` (default) to track everything, `.superwallOnly` to suppress user-initiated tracking, trigger fires, and user-attribute updates while keeping internal SDK events, or `.none` to stop all event collection entirely. The behavior can also be changed at runtime via `Superwall.shared.eventTrackingBehavior`.
 - Deprecated `SuperwallOptions.isExternalDataCollectionEnabled`. Setting it to `false` now maps to `.superwallOnly`; setting it back to `true` maps to `.all`.
diff --git a/Sources/SuperwallKit/Analytics/Attribution/IntegrationAttribute.swift b/Sources/SuperwallKit/Analytics/Attribution/IntegrationAttribute.swift
index 683156562..29603c987 100644
--- a/Sources/SuperwallKit/Analytics/Attribution/IntegrationAttribute.swift
+++ b/Sources/SuperwallKit/Analytics/Attribution/IntegrationAttribute.swift
@@ -73,6 +73,9 @@ public enum IntegrationAttribute: Int {
 
   /// The Appstack identifier.
   case appstackId
+
+  /// The Singular device identifier (SDID).
+  case singularDeviceId
 }
 
 // MARK: - CustomStringConvertible
@@ -123,6 +126,8 @@ extension IntegrationAttribute: CustomStringConvertible {
       return "customerioId"
     case .appstackId:
       return "appstackId"
+    case .singularDeviceId:
+      return "singularDeviceId"
     }
   }
 }
diff --git a/Tests/SuperwallKitTests/Analytics/Attribution/AttributionTests.swift b/Tests/SuperwallKitTests/Analytics/Attribution/AttributionTests.swift
index 330513e74..a5bd749f5 100644
--- a/Tests/SuperwallKitTests/Analytics/Attribution/AttributionTests.swift
+++ b/Tests/SuperwallKitTests/Analytics/Attribution/AttributionTests.swift
@@ -348,7 +348,8 @@ struct AttributionTests {
         .tenjinId: "tenjin-id",
         .posthogUserId: "posthog-user-id",
         .customerioId: "customerio-id",
-        .appstackId: "appstack-id"
+        .appstackId: "appstack-id",
+        .singularDeviceId: "singular-device-id"
       ]
       
       // When
@@ -378,6 +379,7 @@ struct AttributionTests {
       #expect(storedProps["posthogUserId"] as? String == "posthog-user-id")
       #expect(storedProps["customerioId"] as? String == "customerio-id")
       #expect(storedProps["appstackId"] as? String == "appstack-id")
+      #expect(storedProps["singularDeviceId"] as? String == "singular-device-id")
     }
   }