diff --git a/.gitignore b/.gitignore
index 7ad6275..8454dc7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-/.direnv
+/nim.cfg
diff --git a/Tupfile b/Tupfile
new file mode 100644
index 0000000..9368191
--- /dev/null
+++ b/Tupfile
@@ -0,0 +1,3 @@
+include_rules
+: |> !nim_lk |> | ./<lock>
+: lock.json |> !nim_cfg |> | ./<lock>
diff --git a/Tuprules.tup b/Tuprules.tup
index 1b6d078..189eba9 100644
--- a/Tuprules.tup
+++ b/Tuprules.tup
@@ -1,3 +1,3 @@
 include ../syndicate-nim/depends.tup
 NIM_FLAGS += --path:$(TUP_CWD)/../syndicate-nim/src
-NIM_GROUPS += $(TUP_CWD)/../nimble/<nimsha2>
+NIM_GROUPS += $(TUP_CWD)/<lock>
diff --git a/lock.json b/lock.json
new file mode 100644
index 0000000..8ff88e2
--- /dev/null
+++ b/lock.json
@@ -0,0 +1 @@
+{"depends":[{"method":"fetchzip","packages":["syndicate"],"path":"/nix/store/008s11kkqscfqxs6g29q77c38pnrlppi-source","ref":"20231005","rev":"552e51899c82c0c2f4f466382be7d8e22a1da689","sha256":"1j3k0zlh5z02adhfvb7rdqz8fjzc6gri4v3v1fgcv2h2b7vrf0dg","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/syndicate-nim/archive/552e51899c82c0c2f4f466382be7d8e22a1da689.tar.gz"},{"method":"fetchzip","packages":["hashlib"],"path":"/nix/store/v03nzlpdgbfxd2zhcnkfbkq01d5kqxcl-source","rev":"84e0247555e4488594975900401baaf5bbbfb53","sha256":"1pfczsv8kl36qpv543f93d2y2vgz2acckssfap7l51s2x62m6qwx","srcDir":"","url":"https://github.com/khchen/hashlib/archive/84e0247555e4488594975900401baaf5bbbfb53.tar.gz"},{"method":"fetchzip","packages":["preserves"],"path":"/nix/store/vx6ihnickx7d5lwy69i8k7fsjicv33r3-source","ref":"20230914","rev":"c915accf7d2a36ca1f323e2f02e2df7375e815f1","sha256":"11rlcbs9mvk335ibkbj8fk9aslhmnlaiqhcsjpp5n04k447sr7nx","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/preserves-nim/archive/c915accf7d2a36ca1f323e2f02e2df7375e815f1.tar.gz"},{"method":"fetchzip","packages":["nimcrypto"],"path":"/nix/store/zyr8zwh7vaiycn1s4r8cxwc71f2k5l0h-source","ref":"traditional-api","rev":"602c5d20c69c76137201b5d41f788f72afb95aa8","sha256":"1dmdmgb6b9m5f8dyxk781nnd61dsk3hdxqks7idk9ncnpj9fng65","srcDir":"","url":"https://github.com/cheatfate/nimcrypto/archive/602c5d20c69c76137201b5d41f788f72afb95aa8.tar.gz"},{"method":"fetchzip","packages":["npeg"],"path":"/nix/store/ffkxmjmigfs7zhhiiqm0iw2c34smyciy-source","ref":"1.2.1","rev":"26d62fdc40feb84c6533956dc11d5ee9ea9b6c09","sha256":"0xpzifjkfp49w76qmaylan8q181bs45anmp46l4bwr3lkrr7bpwh","srcDir":"src","url":"https://github.com/zevv/npeg/archive/26d62fdc40feb84c6533956dc11d5ee9ea9b6c09.tar.gz"}]}
diff --git a/shell.nix b/shell.nix
index 626cc0e..86568b3 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,5 +1,7 @@
-let
-  syndicate = builtins.getFlake "syndicate";
-  pkgs =
-    import <nixpkgs> { overlays = builtins.attrValues syndicate.overlays; };
-in pkgs.nimPackages.xdg_open_ng
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.nim2Packages.buildNimPackage {
+  name = "dummy";
+  nativeBuildInputs = [ pkgs.pkg-config ];
+  buildInputs = [ pkgs.pcre ];
+}