diff --git a/.env.sample b/.env.sample
index efb1b1c..b652ace 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,3 +1,5 @@
+'.env.development (개발 환경), .env.production (배포 환경)'
+
 NEXT_PUBLIC_BASE_URL=<'server url here'>
 NEXT_PUBLIC_ABORT_MS=<'abort time(ms) for fetch here'>
 SENTRY_AUTH_TOKEN=<'sentry auth token here'>
diff --git a/.gitignore b/.gitignore
index 8e82084..97f3878 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,7 +35,8 @@ yarn-error.log*
 *.tsbuildinfo
 next-env.d.ts
 
-.env
+.env.development
+.env.production
 
 # Sentry Config File
 .env.sentry-build-plugin
diff --git a/src/apis/instance.request.ts b/src/apis/instance.request.ts
index c3b3774..4932cb5 100644
--- a/src/apis/instance.request.ts
+++ b/src/apis/instance.request.ts
@@ -67,7 +67,7 @@ export const instance = async <I, R>(
     });
 
     return (data.body as unknown as SuccessType<R>).data;
-  } catch (err: any) {
+  } catch (err: unknown) {
     const context = err as Response;
     if (
       location &&
@@ -87,7 +87,7 @@ export const instance = async <I, R>(
     } else {
       if (!error?.[`${(err as Response).status}`]) {
         const serverError = new Error(
-          `서버에서 예기치 않은 오류가 발생했습니다. (${err.name})`,
+          `서버에서 예기치 않은 오류가 발생했습니다. (${(err as Error).name})`,
         );
         sentry.captureException(serverError);
         throw serverError;