diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a8aa4c46..f0fa07164 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 The changelog for `SuperwallKit`. Also see the [releases](https://github.com/superwall/Superwall-iOS/releases) on GitHub.
 
+## 4.15.4
+
+### Enhancements
+
+- Adds `singularDeviceId` as an `IntegrationAttribute`.
+
 ## 4.15.3
 
 ### Fixes
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/Sources/SuperwallKit/Misc/Constants.swift b/Sources/SuperwallKit/Misc/Constants.swift
index 2326830fd..e926212ec 100644
--- a/Sources/SuperwallKit/Misc/Constants.swift
+++ b/Sources/SuperwallKit/Misc/Constants.swift
@@ -18,5 +18,5 @@ let sdkVersion = """
 */
 
 let sdkVersion = """
-4.15.3
+4.15.4
 """
diff --git a/SuperwallKit.podspec b/SuperwallKit.podspec
index d7ef7686e..8167b28f9 100644
--- a/SuperwallKit.podspec
+++ b/SuperwallKit.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
 	s.name         = "SuperwallKit"
-  s.version      = "4.15.3"
+  s.version      = "4.15.4"
 	s.summary      = "Superwall: In-App Paywalls Made Easy"
 	s.description  = "Paywall infrastructure for mobile apps :) we make things like editing your paywall and running price tests as easy as clicking a few buttons. superwall.com"
 
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")
     }
   }