diff --git a/src/analytics.ts b/src/analytics.ts
index 246d0c8..6d5b722 100644
--- a/src/analytics.ts
+++ b/src/analytics.ts
@@ -85,6 +85,12 @@ export function createAnalyticsInstance(options?: Options) {
                     ...(growthbookOptions?.attributes?.network_downlink && {
                         network_downlink: growthbookOptions?.attributes.network_downlink,
                     }),
+                    ...(growthbookOptions?.attributes?.user_id && {
+                        user_id: growthbookOptions?.attributes?.user_id,
+                    }),
+                    ...(growthbookOptions?.attributes?.anonymous_id && {
+                        anonymous_id: growthbookOptions?.attributes?.anonymous_id || _rudderstack.getAnonymousId(),
+                    }),
                 }
             growthbookOptions ??= {}
             growthbookOptions.attributes ??= {}
@@ -115,6 +121,7 @@ export function createAnalyticsInstance(options?: Options) {
         device_type,
         account_type,
         user_id,
+        anonymous_id,
         app_id,
         utm_source,
         utm_medium,
@@ -148,8 +155,13 @@ export function createAnalyticsInstance(options?: Options) {
                 url,
                 domain,
                 loggedIn,
+                user_id,
+                anonymous_id,
+            }
+            if (user_identity) {
+                config.id = user_identity
+                config.user_id = user_identity
             }
-            if (user_identity) config.id = user_identity
             _growthbook.setAttributes(config)
         }
 
@@ -167,6 +179,8 @@ export function createAnalyticsInstance(options?: Options) {
             ...(network_downlink && { network_downlink }),
             ...(network_rtt && { network_rtt }),
             ...(network_type && { network_type }),
+            ...(user_id && { user_id }),
+            ...(anonymous_id && { anonymous_id }),
         }
     }
 
diff --git a/src/growthbook.ts b/src/growthbook.ts
index f78ad3a..db49607 100644
--- a/src/growthbook.ts
+++ b/src/growthbook.ts
@@ -90,11 +90,15 @@ export class Growthbook {
         loggedIn,
         network_type,
         network_downlink,
+        user_id,
+        anonymous_id,
     }: TGrowthbookAttributes) => {
         const CURRENT_ATTRIBUTES = this.GrowthBook.getAttributes()
         this.GrowthBook.setAttributes({
             ...CURRENT_ATTRIBUTES,
             id,
+            ...(user_id && { user_id }),
+            ...(anonymous_id && { anonymous_id }),
             ...(country && { country }),
             ...(residence_country && { residence_country }),
             ...(user_language && { user_language }),
diff --git a/src/types.ts b/src/types.ts
index 9f549b0..91602b1 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -23,6 +23,8 @@ export type TGrowthbookAttributes = {
     loggedIn?: boolean
     network_type?: string
     network_downlink?: number
+    user_id?: string
+    anonymous_id?: string
 }
 
 export type TGrowthbookOptions = Partial<Omit<Context, 'attributes'> & { attributes: TCoreAttributes }>