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-checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
-
-[[package]]
-name = "windows_i686_gnu"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
-
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.42.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
-
-[[package]]
-name = "winres"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b68db261ef59e9e52806f688020631e987592bd83619edccda9c47d42cde4f6c"
-dependencies = [
- "toml",
-]
diff --git a/pkgs/tools/misc/kalker/default.nix b/pkgs/tools/misc/kalker/default.nix
index 7c9742da0e66..b076ab351d73 100644
--- a/pkgs/tools/misc/kalker/default.nix
+++ b/pkgs/tools/misc/kalker/default.nix
@@ -8,32 +8,31 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "kalker";
-  version = "2.0.3";
+  version = "2.0.4";
 
   src = fetchFromGitHub {
     owner = "PaddiM8";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-Pj3rcjEbUt+pnmbOZlv2JIvUhVdeiXYDKc5FED6qO7E=";
+    hash = "sha256-8tJi4PRGhNCndiMRdZUvCSdx/+p9OhJyJ3AbD+PucSo=";
   };
 
-  cargoLock = {
-    lockFile = ./Cargo.lock;
-  };
+  cargoHash = "sha256-rGy4tkjjPiV2lpdOtfqjsXgBgi/x+45K4KeUDhyfQoA=";
 
   buildInputs = [ gmp mpfr libmpc ];
 
   outputs = [ "out" "lib" ];
 
-  postPatch = ''
-    ln -s ${./Cargo.lock} Cargo.lock
+  # Cargo.lock is outdated
+  preConfigure = ''
+    cargo metadata --offline
   '';
 
   postInstall = ''
     moveToOutput "lib" "$lib"
   '';
 
-  CARGO_FEATURE_USE_SYSTEM_LIBS = "1";
+  env.CARGO_FEATURE_USE_SYSTEM_LIBS = "1";
 
   meta = with lib; {
     homepage = "https://kalker.strct.net";