diff --git a/README.md b/README.md
index 504d341..31e63d9 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,8 @@ c12 (pronounced as /siːtwelv/, like c-twelve) is a smart configuration loader.
 
 ## Features
 
-- `.json`, `.js`, `.ts`, and `.mjs` config loader with [unjs/jiti](https://github.com/unjs/jiti)
-- `.jsonc` config support with [jsonc-parser](https://github.com/microsoft/node-jsonc-parser)
+- `.js`, `.ts`, `.cjs`, `.mjs` config loader with [unjs/jiti](https://github.com/unjs/jiti)
+- `.json`, `.json5` and `.jsonc` config support.
 - `.rc` config support with [unjs/rc9](https://github.com/unjs/rc9)
 - `.env` support with [dotenv](https://www.npmjs.com/package/dotenv)
 - Multiple sources merged with [unjs/defu](https://github.com/unjs/defu)
diff --git a/package.json b/package.json
index 7cf637c..ec9cb2f 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "dotenv": "^16.3.2",
     "giget": "^1.2.1",
     "jiti": "^1.21.0",
+    "json5": "^2.2.3",
     "jsonc-parser": "^3.2.1",
     "mlly": "^1.5.0",
     "ohash": "^1.1.3",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b869877..84551af 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -20,6 +20,9 @@ dependencies:
   jiti:
     specifier: ^1.21.0
     version: 1.21.0
+  json5:
+    specifier: ^2.2.3
+    version: 2.2.3
   jsonc-parser:
     specifier: ^3.2.1
     version: 3.2.1
@@ -2966,7 +2969,6 @@ packages:
     resolution: {integrity: sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==}
     engines: {node: '>=6'}
     hasBin: true
-    dev: true
 
   /jsonc-parser@3.2.1:
     resolution: {integrity: sha512-AilxAyFOAcK5wA1+LeaySVBrHsGQvUFCDWXKpZjzaL0PqW+xfBOttn8GNtWKFWqneyMZj41MWF9Kl6iPWLwgOA==}
diff --git a/src/loader.ts b/src/loader.ts
index 5143857..edc7455 100644
--- a/src/loader.ts
+++ b/src/loader.ts
@@ -56,6 +56,7 @@ export async function loadConfig<
         ".cts",
         ".json",
         ".jsonc",
+        ".json5",
       ],
       ...options.jitiOptions,
     });
@@ -329,6 +330,9 @@ async function resolveConfig<
   if (res.configFile!.endsWith(".jsonc")) {
     const { parse } = await import("jsonc-parser");
     res.config = parse(await readFile(res.configFile!, "utf8"));
+  } else if (res.configFile!.endsWith(".json5")) {
+    const { parse } = await import("json5");
+    res.config = parse(await readFile(res.configFile!, "utf8"));
   } else {
     res.config = options.jiti!(res.configFile!);
   }
diff --git a/test/fixture/theme/config.ts b/test/fixture/theme/config.json5
similarity index 83%
rename from test/fixture/theme/config.ts
rename to test/fixture/theme/config.json5
index 63ce94f..36e8af5 100644
--- a/test/fixture/theme/config.ts
+++ b/test/fixture/theme/config.json5
@@ -1,7 +1,7 @@
-export default {
+{
   extends: "../.base",
   colors: {
     primary: "theme_primary",
     secondary: "theme_secondary",
   },
-};
+}
diff --git a/test/index.test.ts b/test/index.test.ts
index 5805b6a..395edda 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -143,7 +143,7 @@ describe("c12", () => {
               "secondary": "theme_secondary",
             },
           },
-          "configFile": "<path>/fixture/theme/config.ts",
+          "configFile": "<path>/fixture/theme/config.json5",
           "cwd": "<path>/fixture/theme",
           "meta": {},
           "source": "config",