diff --git a/web/fup/default.nix b/web/fup/default.nix
index c1f1acd062..a459500d6d 100644
--- a/web/fup/default.nix
+++ b/web/fup/default.nix
@@ -12,7 +12,7 @@ pkgs.buildGoModule {
 
   src = ./.;
 
-  vendorSha256 = "sha256:1v9j8wwq9j2njygyn209vzivr6vpdmpdwjivhmjclkyfxq12l0sl";
+  vendorSha256 = "sha256:01q2pqn5j34zsp1al6kidfxd9bj6s1wmz8klywp1mp4lh39ln4sl";
 
   meta = with pkgs.lib; {
     description = "Simple file upload manager.";
diff --git a/web/fup/go.mod b/web/fup/go.mod
index 7ccf4e43c1..81f69dd3eb 100644
--- a/web/fup/go.mod
+++ b/web/fup/go.mod
@@ -8,6 +8,7 @@ go 1.16
 
 require (
 	github.com/dustinkirkland/golang-petname v0.0.0-20191129215211-8e5a1ed0cff0
+	github.com/gabriel-vasile/mimetype v1.2.0 // indirect
 	github.com/google/safehtml v0.0.2
 	github.com/gorilla/mux v1.8.0
 	github.com/spf13/cobra v1.1.3
diff --git a/web/fup/go.sum b/web/fup/go.sum
index 04a985d52f..3e26e764e2 100644
--- a/web/fup/go.sum
+++ b/web/fup/go.sum
@@ -129,6 +129,8 @@ github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHqu
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/gabriel-vasile/mimetype v1.2.0 h1:A6z5J8OhjiWFV91sQ3dMI8apYu/tvP9keDaMM3Xu6p4=
+github.com/gabriel-vasile/mimetype v1.2.0/go.mod h1:6CDPel/o/3/s4+bp6kIbsWATq8pmgOisOPG40CJa6To=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
 github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwvtwp4M=