diff --git a/src/entities/info.ts b/src/entities/info.ts
index 0fdc04c..510814e 100644
--- a/src/entities/info.ts
+++ b/src/entities/info.ts
@@ -1,12 +1,12 @@
 export interface RequestInfo {
-  url: string;
-  method: string;
-  body: string;
-  headers: { [key: string]: string };
+  readonly url: string;
+  readonly method: string;
+  readonly body: string;
+  readonly headers: { [key: string]: string };
 }
 
 export interface ResponseInfo {
-  status: number;
-  body: string;
-  headers: { [key: string]: string };
+  readonly status: number;
+  readonly body: string;
+  readonly headers: { [key: string]: string };
 }
diff --git a/src/entities/management.ts b/src/entities/management.ts
index ee628ca..d56516d 100644
--- a/src/entities/management.ts
+++ b/src/entities/management.ts
@@ -1,25 +1,25 @@
 export interface Project {
-  uuid: string;
-  name: string;
-  sections: ProjectSection[];
-  specs: ProjectRequestSpec[];
+  readonly uuid: string;
+  readonly name: string;
+  readonly sections: ProjectSection[];
+  readonly specs: ProjectRequestSpec[];
 }
 
 export interface ProjectSection {
-  uuid: string;
-  name: string;
+  readonly uuid: string;
+  readonly name: string;
 }
 
 export interface ProjectRequestSpec {
-  uuid: string;
-  url: string;
-  method: "GET" | "POST" | "PUT" | "PATCH" | "DELETE";
-  headers: ProjectRequestSpecHeader[];
-  body: string;
+  readonly uuid: string;
+  readonly url: string;
+  readonly method: "GET" | "POST" | "PUT" | "PATCH" | "DELETE";
+  readonly headers: ProjectRequestSpecHeader[];
+  readonly body: string;
 }
 
 export interface ProjectRequestSpecHeader {
-  key: string;
-  value: string;
-  isEnabled: boolean;
+  readonly key: string;
+  readonly value: string;
+  readonly isEnabled: boolean;
 }
diff --git a/src/features/project-workspace/ProjectWorkspacePage.tsx b/src/features/project-workspace/ProjectWorkspacePage.tsx
index 5d4d6f8..08569e6 100644
--- a/src/features/project-workspace/ProjectWorkspacePage.tsx
+++ b/src/features/project-workspace/ProjectWorkspacePage.tsx
@@ -401,7 +401,7 @@ const HTTP_METHODS: Array<ProjectRequestSpec["method"]> = [
   "PUT",
   "PATCH",
   "DELETE",
-] as const;
+];
 
 function CreateRequestSpecButton() {
   const { create } = useRequestsSpecs();