diff --git a/flake.nix b/flake.nix
index 50c96a9..7ae68ad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -55,7 +55,7 @@
           # The downsides are increased evaluation times and increased system
           # closure size.
           #
-          # nix-bitcoin.useVersionLockedPkgs = true;
+          nix-bitcoin.useVersionLockedPkgs = true;
         ];
       };
     };