diff --git a/src/consts/currency.ts b/src/consts/currency.ts
index 254cc831..a10a6af6 100644
--- a/src/consts/currency.ts
+++ b/src/consts/currency.ts
@@ -1292,5 +1292,5 @@ export const ALL_CURRENCIES: Record<string, CurrencyInfo> = {
 };
 
 export const DEFAULT_CURRENCY_SYMBOL: string = '¤';
-export const DEFAULT_CURRENCY_CODE: string = ALL_CURRENCIES.USD.code;
+export const DEFAULT_CURRENCY_CODE: string = ALL_CURRENCIES['USD'].code;
 export const PARENT_ACCOUNT_CURRENCY_PLACEHOLDER: string = '---';
diff --git a/tsconfig.json b/tsconfig.json
index 71a611e4..0ce32a71 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,8 +6,10 @@
         "types": ["vite/client"],
         "strict": true,
         "noImplicitReturns": true,
+        "noImplicitOverride": true,
         "noUnusedLocals": true,
         "noFallthroughCasesInSwitch": true,
+        "noPropertyAccessFromIndexSignature": true,
         "paths": {
             "@/*": ["./src/*"]
         }
diff --git a/vite.config.ts b/vite.config.ts
index 6306f31e..548cb0f2 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -16,14 +16,14 @@ const BUILD_DIR = resolve(__dirname, './dist',);
 
 export default defineConfig(() => {
     const licenseContent = fs.readFileSync('./LICENSE', { encoding: 'utf-8' });
-    const buildUnixTime = process.env.buildUnixTime || '';
+    const buildUnixTime = process.env['buildUnixTime'] || '';
 
     const options: UserConfig = {
         root: SRC_DIR,
         publicDir: PUBLIC_DIR,
         base: './',
         define: {
-            __EZBOOKKEEPING_IS_PRODUCTION__: process.env.NODE_ENV === 'production',
+            __EZBOOKKEEPING_IS_PRODUCTION__: process.env['NODE_ENV'] === 'production',
             __EZBOOKKEEPING_VERSION__: JSON.stringify(packageFile.version),
             __EZBOOKKEEPING_BUILD_UNIX_TIME__: JSON.stringify(buildUnixTime),
             __EZBOOKKEEPING_BUILD_COMMIT_HASH__: JSON.stringify(git.short()),