diff --git a/bun.lockb b/bun.lockb
index 273ddc7..b06c8d0 100644
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 0c7d218..b188a14 100644
--- a/package.json
+++ b/package.json
@@ -1,34 +1,34 @@
 {
-    "name": "@gramio/files",
-    "main": "./dist/index.js",
-    "version": "0.0.9",
-    "type": "commonjs",
-    "description": "Set of utils for work with files and Telegram Bot API",
-    "keywords": [
-        "gramio",
-        "telegram",
-        "file",
-        "files",
-        "upload"
-    ],
-    "scripts": {
-        "generate": "bun scripts/generate.ts",
-        "prepublishOnly": "tsc",
-        "lint": "bunx @biomejs/biome check ./src",
-        "lint:fix": "bun lint --apply",
-        "jsr": "bun scripts/release-jsr.ts"
-    },
-    "devDependencies": {
-        "@biomejs/biome": "1.7.3",
-        "@types/bun": "^1.1.6",
-        "@types/node": "^20.14.9",
-        "prettier": "^3.3.2",
-        "typescript": "^5.5.2"
-    },
-    "dependencies": {
-        "@gramio/types": "^7.6.0"
-    },
-    "files": [
-        "dist"
-    ]
+  "name": "@gramio/files",
+  "main": "./dist/index.js",
+  "version": "0.0.10",
+  "type": "commonjs",
+  "description": "Set of utils for work with files and Telegram Bot API",
+  "keywords": [
+    "gramio",
+    "telegram",
+    "file",
+    "files",
+    "upload"
+  ],
+  "scripts": {
+    "generate": "bun scripts/generate.ts",
+    "prepublishOnly": "tsc",
+    "lint": "bunx @biomejs/biome check ./src",
+    "lint:fix": "bun lint --apply",
+    "jsr": "bun scripts/release-jsr.ts"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "1.7.3",
+    "@types/bun": "^1.1.6",
+    "@types/node": "^20.14.9",
+    "prettier": "^3.3.2",
+    "typescript": "^5.5.3"
+  },
+  "dependencies": {
+    "@gramio/types": "^7.6.0"
+  },
+  "files": [
+    "dist"
+  ]
 }
diff --git a/src/utils.ts b/src/utils.ts
index e79e25b..cf67a75 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -81,10 +81,10 @@ export async function convertJsonToFormData<T extends keyof APIMethods>(
 	for (let [key, value] of Object.entries(params)) {
 		if (value instanceof Promise) value = await value;
 
-		if (value instanceof Blob) formData.set(key, value);
+		if (value instanceof Blob) formData.append(key, value);
 		else if (typeof value === "object")
-			formData.set(key, JSON.stringify(value));
-		else formData.set(key, String(value));
+			formData.append(key, JSON.stringify(value));
+		else formData.append(key, String(value));
 	}
 
 	return formData;