diff --git a/Formula/ssh-permit-a38.rb b/Formula/ssh-permit-a38.rb
index 68da64cf71468..4e078ba796274 100644
--- a/Formula/ssh-permit-a38.rb
+++ b/Formula/ssh-permit-a38.rb
@@ -22,7 +22,7 @@ def install
     # https://crates.io/crates/openssl#manual-configuration
     ENV["OPENSSL_DIR"] = Formula["openssl@1.1"].opt_prefix
 
-    system "cargo", "install", "--root", prefix, "--path", "."
+    system "cargo", "install", "--locked", "--root", prefix, "--path", "."
   end
 
   test do