diff --git a/src/DapiMixin.ts b/src/DapiMixin.ts
index 5b85c3f..12104f8 100644
--- a/src/DapiMixin.ts
+++ b/src/DapiMixin.ts
@@ -1,5 +1,5 @@
-import {Constructor, ExtractFirstParam} from './types/utils';
-import {DapiFns, DecoratorFn, HookFn} from './types';
+import {Constructor, ExtractFirstParam} from './types/utils.js';
+import {DapiFns, DecoratorFn, HookFn} from './types/index.js';
 
 /**
  * Represents an DAPI definition with dependencies and pure functions.
diff --git a/src/createDapi.ts b/src/createDapi.ts
index a4039ed..bc94650 100644
--- a/src/createDapi.ts
+++ b/src/createDapi.ts
@@ -1,6 +1,6 @@
-import {DapiMixin, DapiDefinition} from './DapiMixin';
-import {DapiFns} from './types';
-import {Constructor} from './types/utils';
+import {DapiMixin, DapiDefinition} from './DapiMixin.js';
+import type {DapiFns} from './types/index.js';
+import {Constructor} from './types/utils.js';
 
 /**
  * Creates an Dapi facade.
diff --git a/src/index.ts b/src/index.ts
index d1ffc92..5050728 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,6 @@
 /**
  * @module @carpasse/dapi
  */
-export {DapiMixin, type DapiDefinition, type DapiWrapper} from './DapiMixin';
+export {DapiMixin, type DapiDefinition, type DapiWrapper} from './DapiMixin.js';
 export type {DapiFns, DapiFn, DecoratorFn, HookFn} from './types';
-export {createDapi} from './createDapi';
+export {createDapi} from './createDapi.js';
diff --git a/src/types/index.ts b/src/types/index.ts
index 1dd29e9..86dd31d 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -1,4 +1,4 @@
-import {AnyFunction} from './utils';
+import {AnyFunction} from './utils.js';
 
 /**
  * Dapi function type. It is a function that receives the dependencies as the first argument.
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
index 12732e9..7680e2f 100644
--- a/tsconfig.esm.json
+++ b/tsconfig.esm.json
@@ -3,6 +3,7 @@
   "compilerOptions": {
     "declaration": true,
     "declarationDir": "./dist/esm",
-    "outDir": "./dist/esm"
+    "outDir": "./dist/esm",
+    "module": "esnext"
   }
 }