diff --git a/package.json b/package.json
index 6eb72f5..736c09a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eppo/js-client-sdk-common",
-  "version": "4.13.2",
+  "version": "4.13.3",
   "description": "Common library for Eppo JavaScript SDKs (web, react native, and node)",
   "main": "dist/index.js",
   "files": [
diff --git a/src/eppo-assignment-logger.spec.ts b/src/eppo-assignment-logger.spec.ts
index 734253a..f9d69d4 100644
--- a/src/eppo-assignment-logger.spec.ts
+++ b/src/eppo-assignment-logger.spec.ts
@@ -46,6 +46,8 @@ describe('EppoAssignmentLogger', () => {
       subject: 'user-123',
       experiment: 'experiment-abc',
       variation: 'variation-1',
+      allocation: 'allocation-1',
+      feature_flag: 'feature-flag-1',
       entity_id: 456,
       holdout: 'holdout-xyz',
       holdout_variation: 'holdout-variant-1',
@@ -76,6 +78,8 @@ describe('EppoAssignmentLogger', () => {
       subject: 'user-123',
       experiment: 'experiment-abc',
       variation: 'variation-1',
+      allocation: 'allocation-1',
+      feature_flag: 'feature-flag-1',
       entity_id: 789,
       holdout: undefined,
       holdout_variation: undefined,
diff --git a/src/eppo-assignment-logger.ts b/src/eppo-assignment-logger.ts
index 4711b98..3826f92 100644
--- a/src/eppo-assignment-logger.ts
+++ b/src/eppo-assignment-logger.ts
@@ -11,7 +11,9 @@ export class EppoAssignmentLogger implements IAssignmentLogger {
   logAssignment(event: IAssignmentEvent): void {
     const {
       entityId: entity_id,
+      featureFlag: feature_flag,
       experiment,
+      allocation,
       // holdout and holdout_variant come from `extraLogging` in FlagEvaluation
       holdoutKey: holdout,
       holdoutVariation: holdout_variation,
@@ -27,6 +29,8 @@ export class EppoAssignmentLogger implements IAssignmentLogger {
     const payload = {
       entity_id,
       experiment,
+      feature_flag,
+      allocation,
       holdout_variation,
       holdout,
       subject,