diff --git a/src/components/app/request-worker.ts b/src/components/app/request-worker.ts
index 65972a8..1a4b25d 100644
--- a/src/components/app/request-worker.ts
+++ b/src/components/app/request-worker.ts
@@ -52,7 +52,7 @@ export class RequestWorker {
    */
   async translationRequestHandler(e: CustomEvent<TranslationRequest>) {
     const { text, resolve, reject } = e.detail;
-    const requestOptions = {
+    const requestOptions: RequestInit = {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json'
@@ -60,7 +60,7 @@ export class RequestWorker {
       body: JSON.stringify({
         source: text
       }),
-      Credentials: 'include'
+      credentials: 'include'
     };
 
     // Helper function to delay execution
diff --git a/src/utils/api-manager.ts b/src/utils/api-manager.ts
index c2f256d..4762fb5 100644
--- a/src/utils/api-manager.ts
+++ b/src/utils/api-manager.ts
@@ -198,9 +198,9 @@ export class APIManager {
     jmespathQuery: string;
   }): Promise<BlobJSONLPayload> => {
     // Fetch the blob
-    const requestOptions = {
+    const requestOptions: RequestInit = {
       method: 'GET',
-      Credentials: 'include'
+      credentials: 'include'
     };
 
     const queryPath = new URLSearchParams();
@@ -262,9 +262,9 @@ export class APIManager {
 
   refreshRendererList = async () => {
     // Fetch the blob
-    const requestOptions = {
+    const requestOptions: RequestInit = {
       method: 'GET',
-      Credentials: 'include'
+      credentials: 'include'
     };
 
     const response = await fetch(