diff --git a/package.json b/package.json
index 736c09a..7dea866 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eppo/js-client-sdk-common",
-  "version": "4.13.3",
+  "version": "4.13.4",
   "description": "Common library for Eppo JavaScript SDKs (web, react native, and node)",
   "main": "dist/index.js",
   "files": [
diff --git a/src/http-client.ts b/src/http-client.ts
index 61cace5..aa38637 100644
--- a/src/http-client.ts
+++ b/src/http-client.ts
@@ -46,6 +46,11 @@ export interface IBanditParametersResponse {
   bandits: Record<string, BanditParameters>;
 }
 
+const urlWithNoTrailingSlash = (url: URL) => {
+  url.pathname = url.pathname.replace(/\/$/, '');
+  return url.toString();
+};
+
 export interface IHttpClient {
   getUniversalFlagConfiguration(): Promise<IUniversalFlagConfigResponse | undefined>;
   getBanditParameters(): Promise<IBanditParametersResponse | undefined>;
@@ -89,7 +94,7 @@ export default class FetchHttpClient implements IHttpClient {
       const controller = new AbortController();
       const signal = controller.signal;
       const timeoutId = setTimeout(() => controller.abort(), this.timeout);
-      const response = await fetch(url.toString(), { signal });
+      const response = await fetch(urlWithNoTrailingSlash(url), { signal });
       // Clear timeout when response is received within the budget.
       clearTimeout(timeoutId);
 
@@ -114,7 +119,7 @@ export default class FetchHttpClient implements IHttpClient {
       const signal = controller.signal;
       const timeoutId = setTimeout(() => controller.abort(), this.timeout);
 
-      const response = await fetch(url.toString(), {
+      const response = await fetch(urlWithNoTrailingSlash(url), {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',