diff --git a/Formula/websocat.rb b/Formula/websocat.rb
index 52cba111493e..6e80f23cec62 100644
--- a/Formula/websocat.rb
+++ b/Formula/websocat.rb
@@ -16,7 +16,7 @@ class Websocat < Formula
   depends_on "rust" => :build
 
   def install
-    system "cargo", "install", "--root", prefix,
+    system "cargo", "install", "--locked", "--root", prefix,
                                "--path", ".",
                                "--features", "ssl"
   end