diff --git a/flake.lock b/flake.lock
index 4c07d21e1a..8c6352bfa7 100644
--- a/flake.lock
+++ b/flake.lock
@@ -105,11 +105,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1694529238,
-        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
@@ -138,11 +138,11 @@
     "hackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1719535035,
-        "narHash": "sha256-kCCfZytGgkRYlsiNe/dwLAnpNOvfywpjVl61hO/8l2M=",
+        "lastModified": 1733099475,
+        "narHash": "sha256-YVGmAXFmh0FkPSrLt33kVAgv79RaffNZOkEvO7Ru1q8=",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "66f23365685f71610460f3c2c0dfa91f96c532ac",
+        "rev": "8b4a3467f2fea817bef20ed424dece1fb1323d4d",
         "type": "github"
       },
       "original": {
@@ -170,6 +170,7 @@
         "hls-2.6": "hls-2.6",
         "hls-2.7": "hls-2.7",
         "hls-2.8": "hls-2.8",
+        "hls-2.9": "hls-2.9",
         "hpc-coveralls": "hpc-coveralls",
         "hydra": "hydra",
         "iserv-proxy": "iserv-proxy",
@@ -184,16 +185,17 @@
         "nixpkgs-2211": "nixpkgs-2211",
         "nixpkgs-2305": "nixpkgs-2305",
         "nixpkgs-2311": "nixpkgs-2311",
+        "nixpkgs-2405": "nixpkgs-2405",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "old-ghc-nix": "old-ghc-nix",
         "stackage": "stackage"
       },
       "locked": {
-        "lastModified": 1719535822,
-        "narHash": "sha256-IteIKK4+GEZI2nHqCz0zRVgQ3aqs/WXKTOt2sbHJmGk=",
+        "lastModified": 1733100689,
+        "narHash": "sha256-xqwYZyeJycNjZbCAW7S810ZErnwJljeLgs2rbpGa0YI=",
         "owner": "input-output-hk",
         "repo": "haskell.nix",
-        "rev": "72bc84d0a4e8d0536505628040d96fd0a9e16c70",
+        "rev": "a611dfa0dfba7fb72790a186a59312e8598464c9",
         "type": "github"
       },
       "original": {
@@ -355,6 +357,23 @@
         "type": "github"
       }
     },
+    "hls-2.9": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1720003792,
+        "narHash": "sha256-qnDx8Pk0UxtoPr7BimEsAZh9g2WuTuMB/kGqnmdryKs=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "0c1817cb2babef0765e4e72dd297c013e8e3d12b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.9.0.1",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
     "hpc-coveralls": {
       "flake": false,
       "locked": {
@@ -546,11 +565,11 @@
     },
     "nixpkgs-2305": {
       "locked": {
-        "lastModified": 1701362232,
-        "narHash": "sha256-GVdzxL0lhEadqs3hfRLuj+L1OJFGiL/L7gCcelgBlsw=",
+        "lastModified": 1705033721,
+        "narHash": "sha256-K5eJHmL1/kev6WuqyqqbS1cdNnSidIZ3jeqJ7GbrYnQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2332963662edffacfddfad59ff4f709dde80ffe",
+        "rev": "a1982c92d8980a0114372973cbdfe0a307f1bdea",
         "type": "github"
       },
       "original": {
@@ -562,11 +581,11 @@
     },
     "nixpkgs-2311": {
       "locked": {
-        "lastModified": 1701386440,
-        "narHash": "sha256-xI0uQ9E7JbmEy/v8kR9ZQan6389rHug+zOtZeZFiDJk=",
+        "lastModified": 1719957072,
+        "narHash": "sha256-gvFhEf5nszouwLAkT9nWsDzocUTqLWHuL++dvNjMp9I=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "293822e55ec1872f715a66d0eda9e592dc14419f",
+        "rev": "7144d6241f02d171d25fba3edeaf15e0f2592105",
         "type": "github"
       },
       "original": {
@@ -576,6 +595,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-2405": {
+      "locked": {
+        "lastModified": 1729242558,
+        "narHash": "sha256-VgcLDu4igNT0eYua6OAl9pWCI0cYXhDbR+pWP44tte0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4a3f2d3195b60d07530574988df92e049372c10e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-24.05-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-regression": {
       "locked": {
         "lastModified": 1643052045,
@@ -594,11 +629,11 @@
     },
     "nixpkgs-release": {
       "locked": {
-        "lastModified": 1719520878,
-        "narHash": "sha256-5BXzNOl2RVHcfS/oxaZDKOi7gVuTyWPibQG0DHd5sSc=",
+        "lastModified": 1733107608,
+        "narHash": "sha256-jdX4KeRP2J1Rj7IRWK5xZFvxr8yjw+PQnCc8n2XclVA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a44bedbb48c367f0476e6a3a27bf28f6330faf23",
+        "rev": "c1c8d3d0b640adbb35a416e5cf8fbaf2186924d0",
         "type": "github"
       },
       "original": {
@@ -610,17 +645,17 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1694822471,
-        "narHash": "sha256-6fSDCj++lZVMZlyqOe9SIOL8tYSBz1bI8acwovRwoX8=",
+        "lastModified": 1729980323,
+        "narHash": "sha256-eWPRZAlhf446bKSmzw6x7RWEE4IuZgAp8NW3eXZwRAY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "47585496bcb13fb72e4a90daeea2f434e2501998",
+        "rev": "86e78d3d2084ff87688da662cf78c2af085d8e73",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
-        "rev": "47585496bcb13fb72e4a90daeea2f434e2501998",
         "type": "github"
       }
     },
@@ -655,11 +690,11 @@
     "stackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1719102283,
-        "narHash": "sha256-pon+cXgMWPlCiBx9GlRcjsjTHbCc8fDVgOGb3Z7qhRM=",
+        "lastModified": 1733012053,
+        "narHash": "sha256-tGP50DXm44W8fyhbPE9RqJ/vMz8haA/UEuMikHUK6rI=",
         "owner": "input-output-hk",
         "repo": "stackage.nix",
-        "rev": "7df45e0bd9852810d8070f9c5257f8e7a4677b91",
+        "rev": "7f5618355d29e4b4d3eb0d927fba63055a4a4856",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index a266bd2e29..54d5919e9a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,7 @@
         vscodeSettings."haskell.toolchain"
         ## There are some things we want to pin that the VS Code Haskell extension doesn’t let us control.
         // {
-        hpack = "0.35.2";
+        hpack = "0.36.1";
         ormolu = "0.7.2.0";
       };
       pkgs = import nixpkgs-haskellNix {