diff --git a/.cargo/config b/.cargo/config.toml
similarity index 100%
rename from .cargo/config
rename to .cargo/config.toml
diff --git a/crane.nix b/crane.nix
index c07adf8..a30fed8 100644
--- a/crane.nix
+++ b/crane.nix
@@ -12,7 +12,7 @@
 let
   inherit (stdenv.hostPlatform) system;
 
-  nightlyVersion = "2023-05-01";
+  nightlyVersion = "2024-03-28";
   rustNightly = (pkgs.rust-bin.nightly.${nightlyVersion}.default.override {
     extensions = [ "rust-src" "rust-analyzer-preview" ];
     targets = cargoTargets;
diff --git a/flake.lock b/flake.lock
index c561711..0b1ffeb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,26 +2,21 @@
   "nodes": {
     "crane": {
       "inputs": {
-        "flake-compat": [
-          "flake-compat"
-        ],
-        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
-        ],
-        "rust-overlay": "rust-overlay"
+        ]
       },
       "locked": {
-        "lastModified": 1695511445,
-        "narHash": "sha256-mnE14re43v3/Jc50Jv0BKPMtEk7FEtDSligP6B5HwlI=",
-        "rev": "3de322e06fc88ada5e3589dc8a375b73e749f512",
-        "revCount": 411,
+        "lastModified": 1710886643,
+        "narHash": "sha256-saTZuv9YeZ9COHPuj8oedGdUwJZcbQ3vyRqe7NVJMsQ=",
+        "rev": "5bace74e9a65165c918205cf67ad3977fe79c584",
+        "revCount": 525,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/ipetkov/crane/0.14.1/018ac45c-ff5e-7076-b956-d478a0336516/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/ipetkov/crane/0.16.3/018e58cb-e73a-767a-a419-c5d172da29bb/source.tar.gz"
       },
       "original": {
         "type": "tarball",
-        "url": "https://flakehub.com/f/ipetkov/crane/0.14.1.tar.gz"
+        "url": "https://flakehub.com/f/ipetkov/crane/0.16.3.tar.gz"
       }
     },
     "flake-compat": {
@@ -59,29 +54,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1685518550,
-        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1681202837,
-        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
         "type": "github"
       },
       "original": {
@@ -93,11 +70,11 @@
     "libgit2": {
       "flake": false,
       "locked": {
-        "lastModified": 1709118350,
-        "narHash": "sha256-JptPxlhXS3VHDYNKWTud7ubs1qweF6g0Vo6Epojporc=",
+        "lastModified": 1697646580,
+        "narHash": "sha256-oX4Z3S9WtJlwvj0uH9HlYcWv+x1hqp8mhXl7HsLu2f0=",
         "owner": "libgit2",
         "repo": "libgit2",
-        "rev": "4ab9c401ab36080707ab27aafd0c247af4399ef6",
+        "rev": "45fd9ed7ae1a9b74b957ef4f337bc3c8b3df01b5",
         "type": "github"
       },
       "original": {
@@ -114,12 +91,12 @@
         "nixpkgs-regression": "nixpkgs-regression"
       },
       "locked": {
-        "lastModified": 1708517151,
-        "narHash": "sha256-s7QTMxLzVA5UF80sFCv8jwaTMBLA8/110YFkZNkNsCk=",
-        "rev": "8a8172cd2b5ef2f6dd2d9673a6379447d780ff17",
-        "revCount": 16129,
+        "lastModified": 1711461841,
+        "narHash": "sha256-iRtvOcJbohyhav+deEajI/Ln/LU/6WqSfLyXDQaNEro=",
+        "rev": "3272ed0d5813175ea240ce2dfadf9de24c9d14ae",
+        "revCount": 16479,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nix/2.20.3/018dcc43-c784-772a-8da1-64165044e9cd/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nix/2.21.1/018e7be9-60f2-7fe1-9c78-96dd0769050f/source.tar.gz"
       },
       "original": {
         "type": "tarball",
@@ -128,16 +105,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1705033721,
-        "narHash": "sha256-K5eJHmL1/kev6WuqyqqbS1cdNnSidIZ3jeqJ7GbrYnQ=",
+        "lastModified": 1709083642,
+        "narHash": "sha256-7kkJQd4rZ+vFrzWu8sTRtta5D1kBG0LSRYAfhtmMlSo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a1982c92d8980a0114372973cbdfe0a307f1bdea",
+        "rev": "b550fe4b4776908ac2a861124307045f8e717c8e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.05-small",
+        "ref": "release-23.11",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -160,12 +137,12 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1704420045,
-        "narHash": "sha256-C36QmoJd5tdQ5R9MC1jM7fBkZW9zBUqbUCsgwS6j4QU=",
-        "rev": "c1be43e8e837b8dbee2b3665a007e761680f0c3d",
-        "revCount": 553958,
+        "lastModified": 1711460390,
+        "narHash": "sha256-akSgjDZL6pVHEfSE6sz1DNSXuYX6hq+P/1Z5IoYWs7E=",
+        "rev": "44733514b72e732bd49f5511bd0203dea9b9a434",
+        "revCount": 557010,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2311.553958%2Brev-c1be43e8e837b8dbee2b3665a007e761680f0c3d/018cdf41-5b79-7317-9544-bd9c236b12d2/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2311.557010%2Brev-44733514b72e732bd49f5511bd0203dea9b9a434/018e7fb1-6425-7bf8-9105-2e6dcdc10701/source.tar.gz"
       },
       "original": {
         "type": "tarball",
@@ -178,47 +155,22 @@
         "flake-compat": "flake-compat",
         "nix": "nix",
         "nixpkgs": "nixpkgs_2",
-        "rust-overlay": "rust-overlay_2"
+        "rust-overlay": "rust-overlay"
       }
     },
     "rust-overlay": {
       "inputs": {
-        "flake-utils": [
-          "crane",
-          "flake-utils"
-        ],
-        "nixpkgs": [
-          "crane",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1685759304,
-        "narHash": "sha256-I3YBH6MS3G5kGzNuc1G0f9uYfTcNY9NYoRc3QsykLk4=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "c535b4f3327910c96dcf21851bbdd074d0760290",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
-    "rust-overlay_2": {
-      "inputs": {
-        "flake-utils": "flake-utils_2",
+        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1687400833,
-        "narHash": "sha256-rVENiSupjAE8o1+ZXNRIqewUzM2brm+aeme8MUrwl0U=",
+        "lastModified": 1711678273,
+        "narHash": "sha256-7lIB0hMRnfzx/9oSIwTnwXmVnbvVGRoadOCW+1HI5zY=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "fc0a266e836c079a9131108f4334e5af219dbb93",
+        "rev": "42a168449605950935f15ea546f6f770e5f7f629",
         "type": "github"
       },
       "original": {
@@ -241,21 +193,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index d5d807d..d15722f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,9 +10,8 @@
     };
 
     crane = {
-      url = "https://flakehub.com/f/ipetkov/crane/0.14.1.tar.gz";
+      url = "https://flakehub.com/f/ipetkov/crane/0.16.3.tar.gz";
       inputs.nixpkgs.follows = "nixpkgs";
-      inputs.flake-compat.follows = "flake-compat";
     };
 
     flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.0.1.tar.gz";
diff --git a/magic-nix-cache/src/flakehub.rs b/magic-nix-cache/src/flakehub.rs
index d6d77d6..88a1def 100644
--- a/magic-nix-cache/src/flakehub.rs
+++ b/magic-nix-cache/src/flakehub.rs
@@ -18,6 +18,7 @@ use uuid::Uuid;
 const USER_AGENT: &str = "magic-nix-cache";
 
 pub struct State {
+    #[allow(dead_code)]
     pub substituter: Url,
 
     pub push_session: PushSession,