diff --git a/go.sum b/go.sum
index 8f23b48..07b72b6 100644
--- a/go.sum
+++ b/go.sum
@@ -83,7 +83,6 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
@@ -371,7 +370,6 @@ google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
-google.golang.org/appengine v1.6.6 h1:lMO5rYAqUxkmaj76jAkRUvt5JZgFymx/+Q5Mzfivuhc=
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
 google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
diff --git a/main.go b/main.go
index 5d26e03..df8642d 100644
--- a/main.go
+++ b/main.go
@@ -10,6 +10,7 @@ import (
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/drive/v3"
+	"google.golang.org/api/googleapi"
 	"google.golang.org/api/option"
 	"log"
 	"os"
@@ -169,6 +170,10 @@ func main() {
 		"check-token",
 		false,
 		"True to exit after getting the token.")
+	contentType := flag.String(
+		"content-type",
+		"",
+		"The content type to upload as. If omitted, no explicit content type is set.")
 	flag.Parse()
 	var dataFile *os.File
 	var dataFilename string
@@ -219,14 +224,19 @@ func main() {
 		Name: dataFilename,
 	}
 
+	var mediaOptions []googleapi.MediaOption
+	if *contentType != "" {
+		mediaOptions = append(mediaOptions, googleapi.ContentType(*contentType))
+	}
+
 	if *fileId != "" {
-		fileOut, err := srv.Files.Update(*fileId, &metadata).Media(dataFile).Do()
+		fileOut, err := srv.Files.Update(*fileId, &metadata).Media(dataFile, mediaOptions...).Do()
 		if err != nil {
 			log.Fatalf("Failed updating file %s: %v", *fileId, err)
 		}
 		fmt.Println(fileOut.Id)
 	} else {
-		fileOut, err := srv.Files.Create(&metadata).Media(dataFile).Do()
+		fileOut, err := srv.Files.Create(&metadata).Media(dataFile, mediaOptions...).Do()
 		if err != nil {
 			log.Fatalf("Failed uploading file: %v", err)
 		}