diff --git a/nix/default.nix b/nix/default.nix
index 3ca9e23..468a6da 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -32,7 +32,11 @@ rustPlatform.buildRustPackage {
     );
   };
 
-  cargoLock.lockFile = ../Cargo.lock;
+  cargoLock = {
+    lockFile = ../Cargo.lock;
+
+    outputHashes."comrak-0.33.0" = "sha256-C7srY7ehXrEZuc7nm2knPCIpD1MQ/qq9MORW5H0j4ms=";
+  };
 
   nativeBuildInputs = [
     just