diff --git a/package.json b/package.json
index 80000a4..052910c 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,6 @@
     "esbuild": "^0.24.0",
     "fs-extra": "^11.2.0",
     "hookable": "^5.5.3",
-    "mime": "^4.0.4",
     "octokit": "^4.0.2",
     "std-env": "^3.8.0",
     "tiny-update-notifier": "^2.0.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 14cde88..1977729 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -44,9 +44,6 @@ importers:
       hookable:
         specifier: ^5.5.3
         version: 5.5.3
-      mime:
-        specifier: ^4.0.4
-        version: 4.0.4
       octokit:
         specifier: ^4.0.2
         version: 4.0.2
@@ -2749,11 +2746,6 @@ packages:
     resolution: {integrity: sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==}
     engines: {node: '>=8.6'}
 
-  mime@4.0.4:
-    resolution: {integrity: sha512-v8yqInVjhXyqP6+Kw4fV3ZzeMRqEW6FotRsKXjRS5VMTNIuXsdRoAvklpoRgSqXm6o9VNH4/C0mgedko9DdLsQ==}
-    engines: {node: '>=16'}
-    hasBin: true
-
   mimic-fn@4.0.0:
     resolution: {integrity: sha512-vqiC06CuhBTUdZH+RYl8sFrL096vA45Ok5ISO6sE/Mr1jRbGH4Csnhi8f3wKVl7x8mO4Au7Ir9D3Oyv1VYMFJw==}
     engines: {node: '>=12'}
@@ -6553,8 +6545,6 @@ snapshots:
       braces: 3.0.3
       picomatch: 2.3.1
 
-  mime@4.0.4: {}
-
   mimic-fn@4.0.0: {}
 
   min-indent@1.0.1: {}
diff --git a/src/core/releaser/github.ts b/src/core/releaser/github.ts
index c65c3a3..955932e 100644
--- a/src/core/releaser/github.ts
+++ b/src/core/releaser/github.ts
@@ -2,9 +2,9 @@ import type { Context } from "../../types/index.js";
 import { readFile, stat } from "node:fs/promises";
 import { basename, join } from "node:path";
 import process from "node:process";
-import mime from "mime";
 import { Octokit } from "octokit";
 import { glob } from "tinyglobby";
+import { getMimeTypeByFileName } from "../../utils/mime.js";
 import { ReleaseBase } from "./base.js";
 
 export default class GitHub extends ReleaseBase {
@@ -94,7 +94,7 @@ export default class GitHub extends ReleaseBase {
         release_id: releaseID,
         data: await readFile(asset) as unknown as string,
         headers: {
-          "content-type": mime.getType(asset) || "application/octet-stream",
+          "content-type": getMimeTypeByFileName(asset) || "application/octet-stream",
           "content-length": (await stat(asset)).size,
         },
         name: basename(asset),
diff --git a/src/utils/mime.ts b/src/utils/mime.ts
new file mode 100644
index 0000000..396bb00
--- /dev/null
+++ b/src/utils/mime.ts
@@ -0,0 +1,17 @@
+import { extname } from "node:path";
+
+const mimeTypes: { [key: string]: string[] } = {
+  "application/json": ["json"],
+  "application/x-xpinstall": ["xpi"],
+};
+
+export function getMimeTypeByFileName(filename: string) {
+  const ext = extname(filename);
+
+  for (const type in mimeTypes) {
+    if (mimeTypes[type].includes(ext))
+      return type;
+  }
+
+  return undefined;
+}