diff --git a/biome.json b/biome.json
index 21f22c1d8..845556dcb 100644
--- a/biome.json
+++ b/biome.json
@@ -10,6 +10,11 @@
     "enabled": true,
     "rules": {
       "recommended": true,
+      "correctness": {
+        "noUnusedVariables": "error",
+        "noUnusedImports": "error",
+        "noUnusedFunctionParameters": "error"
+      },
       "style": {
         "useImportType": "error"
       }
diff --git a/tests/unit/cli/commands/download/DownloadCommand.test.ts b/tests/unit/cli/commands/download/DownloadCommand.test.ts
index 67f9b8f17..331527752 100644
--- a/tests/unit/cli/commands/download/DownloadCommand.test.ts
+++ b/tests/unit/cli/commands/download/DownloadCommand.test.ts
@@ -108,7 +108,7 @@ describe('DownloadCommand', () => {
 
   const createDownloadCommand = (configOverrides: Partial<Config> = {}) => {
     return new DownloadCommand(
-      async (command: Command) => ({
+      async () => ({
         ...config,
         basePath: tempDir,
         ...configOverrides,
diff --git a/tests/unit/cli/commands/file/FileCommand.test.ts b/tests/unit/cli/commands/file/FileCommand.test.ts
index eab43ef89..2ef9aa76b 100644
--- a/tests/unit/cli/commands/file/FileCommand.test.ts
+++ b/tests/unit/cli/commands/file/FileCommand.test.ts
@@ -941,7 +941,7 @@ describe('FileCommand', () => {
       deleteProjectFile,
     };
     const fileCommand = new FileCommand(
-      async (command: Command) => ({ ...config, basePath: tempDir }),
+      async () => ({ ...config, basePath: tempDir }),
       () => output,
       async () => projectService as never,
       async () => storageService,
diff --git a/tests/unit/cli/commands/language/LanguageCommand.test.ts b/tests/unit/cli/commands/language/LanguageCommand.test.ts
index 2bacc4f7d..1e2f2fc05 100644
--- a/tests/unit/cli/commands/language/LanguageCommand.test.ts
+++ b/tests/unit/cli/commands/language/LanguageCommand.test.ts
@@ -249,12 +249,7 @@ describe('LanguageCommand', () => {
       },
     } as never);
 
-    await new LanguageCommand(
-      () => output,
-      async () => projectService,
-      async () => languageService,
-      async () => config,
-    ).listAction(commandContext);
+    await languageCommand.listAction(commandContext);
 
     // list() writes a line per item, where the old formatter joined them into a single write.
     expect(console.log).toHaveBeenCalledWith('fr');