diff --git a/Makefile b/Makefile
index ea21af4..399ca39 100644
--- a/Makefile
+++ b/Makefile
@@ -12,9 +12,9 @@ clean:
 	go clean
 
 upgrade:
-        rm -rf vendor
-        go get -d -u -t ./...
-        go mod tidy
-        go mod vendor
+	rm -rf vendor
+	go get -d -u -t ./...
+	go mod tidy
+	go mod vendor
 
 # vim: set ft=make noet ai ts=4 sw=4 sts=4: