diff --git a/package.json b/package.json
index b4ce8c099..42f19aa19 100644
--- a/package.json
+++ b/package.json
@@ -26,9 +26,9 @@
     "start-test-server": "npm run switch-server; rimraf ./data-test; cross-env TRILIUM_DATA_DIR=./data-test TRILIUM_SYNC_SERVER_HOST=http://tsyncserver:4000 TRILIUM_ENV=dev TRILIUM_PORT=9999 ts-node src/main.ts",
     "qstart-server": "npm run switch-server && npm run start-server",
     "start-electron": "npm run prepare-dist && cross-env TRILIUM_DATA_DIR=./data TRILIUM_SYNC_SERVER_HOST=http://tsyncserver:4000 TRILIUM_ENV=dev electron ./dist/electron-main.js --inspect=5858 .",
-    "start-electron-nix": "npm run prepare-dist && cross-env TRILIUM_DATA_DIR=./data TRILIUM_SYNC_SERVER_HOST=http://tsyncserver:4000 TRILIUM_ENV=dev nix-shell -p electron_31 --run \"electron ./dist/electron-main.js --inspect=5858 .\"",
+    "start-electron-nix": "npm run prepare-dist && cross-env TRILIUM_DATA_DIR=./data TRILIUM_SYNC_SERVER_HOST=http://tsyncserver:4000 TRILIUM_ENV=dev nix-shell -p electron_33 --run \"electron ./dist/electron-main.js --inspect=5858 .\"",
     "start-electron-no-dir": "npm run prepare-dist && cross-env TRILIUM_ENV=dev electron --inspect=5858 .",
-    "start-electron-no-dir-nix": "npm run prepare-dist && cross-env TRILIUM_ENV=dev nix-shell -p electron_31 --run \"electron ./dist/electron-main.js --inspect=5858 .\"",
+    "start-electron-no-dir-nix": "npm run prepare-dist && cross-env TRILIUM_ENV=dev nix-shell -p electron_33 --run \"electron ./dist/electron-main.js --inspect=5858 .\"",
     "qstart-electron": "npm run switch-electron && npm run start-electron",
     "switch-server": "rimraf ./node_modules/better-sqlite3 && npm install",
     "switch-electron": "npx electron-rebuild",
diff --git a/src/routes/api/sender.ts b/src/routes/api/sender.ts
index 890eefa98..22eea766d 100644
--- a/src/routes/api/sender.ts
+++ b/src/routes/api/sender.ts
@@ -7,7 +7,7 @@ import sanitize_attribute_name from "../../services/sanitize_attribute_name.js";
 import specialNotesService from "../../services/special_notes.js";
 import { Request } from 'express';
 
-function uploadImage(req: Request) {
+async function uploadImage(req: Request) {
     const file = req.file;
 
     if (!file) {
@@ -24,7 +24,7 @@ function uploadImage(req: Request) {
         return [400, "Invalid image content type."];
     }
 
-    const uploadedImageType = imageType(file.buffer);
+    const uploadedImageType = await imageType(file.buffer);
     if (!uploadedImageType) {
         return [400, "Unable to determine image type."];
     }