diff --git a/server/default.nix b/server/default.nix
index 7008e43..ac480d3 100644
--- a/server/default.nix
+++ b/server/default.nix
@@ -17,7 +17,7 @@ in
     { name = "Cargo.lock"; path = "${./Cargo.lock}"; }
     { name = "src"; path = "${./src}"; }
   ];
-  cargoHash = "sha256-1JB9GCJpiyYjAghUXQphUuUUJmRRxutbW+NXNDM83c4=";
+  cargoLock.lockFile = ./Cargo.lock;
   checkPhase = "true";
   target = "x86_64-unknown-linux-musl";
 }
diff --git a/update-server-sha256.sh b/update-server-sha256.sh
deleted file mode 100755
index 6b6ee83..0000000
--- a/update-server-sha256.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/sh
-OLD_SHA256=$(nix eval --raw --impure --expr '(import ./build.nix {}).server.cargoHash')
-NEW_SHA256=$(nix-shell -p nix-prefetch --command 'nix-prefetch -E "(import ./build.nix {}).serverCargoDeps"')
-if [[ $OLD_SHA256 != $NEW_SHA256 ]]; then
-    printf "changing %s -> %s\n" "$OLD_SHA256" "$NEW_SHA256"
-    sed -i "s@$OLD_SHA256@$NEW_SHA256@g" server/default.nix
-fi