diff --git a/.size-limit.json b/.size-limit.json
index b634efc..23d5a2d 100644
--- a/.size-limit.json
+++ b/.size-limit.json
@@ -1,37 +1,37 @@
 [
   {
     "name": "useAnimation",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ useAnimation }",
     "limit": "1.0 kB"
   },
   {
     "name": "useAnimationFunction",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ useAnimationFunction }",
     "limit": "1.0 kB"
   },
   {
     "name": "useScrollTimeline",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ useScrollTimeline }",
     "limit": "0.3 kB"
   },
   {
     "name": "useViewTimeline",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ useViewTimeline }",
     "limit": "0.3 kB"
   },
   {
     "name": "useTransitionAnimation",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ useTransitionAnimation }",
     "limit": "1.3 kB"
   },
   {
     "name": "TransitionGroup",
-    "path": "lib/index.mjs",
+    "path": "lib/index.js",
     "import": "{ TransitionGroup }",
     "limit": "0.5 kB"
   }
diff --git a/package.json b/package.json
index 030d9e2..c1c388d 100644
--- a/package.json
+++ b/package.json
@@ -2,14 +2,15 @@
   "name": "react-animatable",
   "version": "0.15.2",
   "description": "Tiny(~1kB) animation hooks for React, built on Web Animations API.",
-  "main": "lib/index.js",
-  "module": "lib/index.mjs",
+  "main": "lib/index.cjs",
+  "module": "lib/index.js",
   "types": "lib/index.d.ts",
+  "type": "module",
   "exports": {
     "./package.json": "./package.json",
     ".": {
       "types": "./lib/index.d.ts",
-      "import": "./lib/index.mjs",
+      "require": "./lib/index.cjs",
       "default": "./lib/index.js"
     }
   },
diff --git a/rollup.config.mjs b/rollup.config.js
similarity index 100%
rename from rollup.config.mjs
rename to rollup.config.js