diff --git a/Formula/toast.rb b/Formula/toast.rb
index 5876c0f998e7c..43664536809c4 100644
--- a/Formula/toast.rb
+++ b/Formula/toast.rb
@@ -14,7 +14,7 @@ class Toast < Formula
   depends_on "rust" => :build
 
   def install
-    system "cargo", "install", "--root", prefix, "--path", "."
+    system "cargo", "install", "--locked", "--root", prefix, "--path", "."
   end
 
   test do