diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index dd402da..31a2e8d 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -2,7 +2,10 @@
 #
 # SPDX-License-Identifier: MPL-2.0
 name: Nix flake check
-on: push
+on:
+  pull_request:
+  push:
+      branches: master
 
 jobs:
   validate:
diff --git a/flake.lock b/flake.lock
index cbb8228..b2f3b17 100644
--- a/flake.lock
+++ b/flake.lock
@@ -211,33 +211,33 @@
         "type": "github"
       }
     },
-    "ghc98X": {
+    "ghc910X": {
       "flake": false,
       "locked": {
-        "lastModified": 1696643148,
-        "narHash": "sha256-E02DfgISH7EvvNAu0BHiPvl1E5FGMDi0pWdNZtIBC9I=",
-        "ref": "ghc-9.8",
-        "rev": "443e870d977b1ab6fc05f47a9a17bc49296adbd6",
-        "revCount": 61642,
+        "lastModified": 1714520650,
+        "narHash": "sha256-4uz6RA1hRr0RheGNDM49a/B3jszqNNU8iHIow4mSyso=",
+        "ref": "ghc-9.10",
+        "rev": "2c6375b9a804ac7fca1e82eb6fcfc8594c67c5f5",
+        "revCount": 62663,
         "submodules": true,
         "type": "git",
         "url": "https://gitlab.haskell.org/ghc/ghc"
       },
       "original": {
-        "ref": "ghc-9.8",
+        "ref": "ghc-9.10",
         "submodules": true,
         "type": "git",
         "url": "https://gitlab.haskell.org/ghc/ghc"
       }
     },
-    "ghc99": {
+    "ghc911": {
       "flake": false,
       "locked": {
-        "lastModified": 1701580282,
-        "narHash": "sha256-drA01r3JrXnkKyzI+owMZGxX0JameMzjK0W5jJE/+V4=",
+        "lastModified": 1714817013,
+        "narHash": "sha256-m2je4UvWfkgepMeUIiXHMwE6W+iVfUY38VDGkMzjCcc=",
         "ref": "refs/heads/master",
-        "rev": "f5eb0f2982e9cf27515e892c4bdf634bcfb28459",
-        "revCount": 62197,
+        "rev": "fc24c5cf6c62ca9e3c8d236656e139676df65034",
+        "revCount": 62816,
         "submodules": true,
         "type": "git",
         "url": "https://gitlab.haskell.org/ghc/ghc"
@@ -267,11 +267,11 @@
     "hackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1715560494,
-        "narHash": "sha256-JAPXpr+I48XosjkYiXDyRRV1K8UJwEn7ypSR30Q812U=",
+        "lastModified": 1720399158,
+        "narHash": "sha256-WNSc9h/Ci3HpnM6HdgdDsOOiARjIIhlpD+G0r3+WceM=",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "a62dac66a95f2fb407c824592c6f325b8f7d0b60",
+        "rev": "5153fdaef0f7d332cbac319a33b7ed1ecee80a36",
         "type": "github"
       },
       "original": {
@@ -288,8 +288,8 @@
         "cardano-shell": "cardano-shell",
         "flake-compat": "flake-compat_2",
         "ghc-8.6.5-iohk": "ghc-8.6.5-iohk",
-        "ghc98X": "ghc98X",
-        "ghc99": "ghc99",
+        "ghc910X": "ghc910X",
+        "ghc911": "ghc911",
         "hackage": [
           "hackage"
         ],
@@ -298,6 +298,10 @@
         "hls-2.2": "hls-2.2",
         "hls-2.3": "hls-2.3",
         "hls-2.4": "hls-2.4",
+        "hls-2.5": "hls-2.5",
+        "hls-2.6": "hls-2.6",
+        "hls-2.7": "hls-2.7",
+        "hls-2.8": "hls-2.8",
         "hpc-coveralls": "hpc-coveralls",
         "hydra": "hydra",
         "iserv-proxy": "iserv-proxy",
@@ -319,11 +323,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1704847818,
-        "narHash": "sha256-LQzIY21CkCirSSR+7fB5uQjlFGBzCvjA0x/TuPXT3V8=",
+        "lastModified": 1718931026,
+        "narHash": "sha256-jc+F58pb9Zh860XjeLZiQH8+fylDse5yczdkvt4SKvY=",
         "owner": "input-output-hk",
         "repo": "haskell.nix",
-        "rev": "28fceff2ef63b5bd0717371df5500a58ace98ee6",
+        "rev": "34946405e89825c757aca192ab13a31313ccef8e",
         "type": "github"
       },
       "original": {
@@ -416,6 +420,74 @@
         "type": "github"
       }
     },
+    "hls-2.5": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1701080174,
+        "narHash": "sha256-fyiR9TaHGJIIR0UmcCb73Xv9TJq3ht2ioxQ2mT7kVdc=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "27f8c3d3892e38edaef5bea3870161815c4d014c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.5.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.6": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1705325287,
+        "narHash": "sha256-+P87oLdlPyMw8Mgoul7HMWdEvWP/fNlo8jyNtwME8E8=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "6e0b342fa0327e628610f2711f8c3e4eaaa08b1e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.6.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.7": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1708965829,
+        "narHash": "sha256-LfJ+TBcBFq/XKoiNI7pc4VoHg4WmuzsFxYJ3Fu+Jf+M=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "50322b0a4aefb27adc5ec42f5055aaa8f8e38001",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.7.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "hls-2.8": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1715153580,
+        "narHash": "sha256-Vi/iUt2pWyUJlo9VrYgTcbRviWE0cFO6rmGi9rmALw0=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "dd1be1beb16700de59e0d6801957290bcf956a0a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "2.8.0.0",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
     "hpc-coveralls": {
       "flake": false,
       "locked": {
@@ -458,18 +530,18 @@
     "iserv-proxy": {
       "flake": false,
       "locked": {
-        "lastModified": 1691634696,
-        "narHash": "sha256-MZH2NznKC/gbgBu8NgIibtSUZeJ00HTLJ0PlWKCBHb0=",
-        "ref": "hkm/remote-iserv",
-        "rev": "43a979272d9addc29fbffc2e8542c5d96e993d73",
-        "revCount": 14,
-        "type": "git",
-        "url": "https://gitlab.haskell.org/hamishmack/iserv-proxy.git"
+        "lastModified": 1717479972,
+        "narHash": "sha256-7vE3RQycHI1YT9LHJ1/fUaeln2vIpYm6Mmn8FTpYeVo=",
+        "owner": "stable-haskell",
+        "repo": "iserv-proxy",
+        "rev": "2ed34002247213fc435d0062350b91bab920626e",
+        "type": "github"
       },
       "original": {
-        "ref": "hkm/remote-iserv",
-        "type": "git",
-        "url": "https://gitlab.haskell.org/hamishmack/iserv-proxy.git"
+        "owner": "stable-haskell",
+        "ref": "iserv-syms",
+        "repo": "iserv-proxy",
+        "type": "github"
       }
     },
     "lowdown-src": {
@@ -705,10 +777,12 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 0,
-        "narHash": "sha256-dd/N4mTzE8tT1vHeOdAhiyXNHgtrfIqAUC0zz6yp8QM=",
-        "path": "/nix/store/b4vjszbzi7fnnkhdynja9f3js6s4sfjm-source",
-        "type": "path"
+        "lastModified": 1719840997,
+        "narHash": "sha256-Qcz4H+7u5xu+81el88at+8lGHyEZ7pNwk6nAcyzdkts=",
+        "owner": "serokell",
+        "repo": "nixpkgs",
+        "rev": "fe065f84d7faf5aec1ba29bfcc8b7993bf2dcf8a",
+        "type": "github"
       },
       "original": {
         "id": "nixpkgs",
@@ -813,11 +887,11 @@
     "stackage": {
       "flake": false,
       "locked": {
-        "lastModified": 1715473225,
-        "narHash": "sha256-uAD2qephrnRmMdLiLNqbGXfgc0BGHveiHbRhm19cNs0=",
+        "lastModified": 1720225382,
+        "narHash": "sha256-VThVHFjBiGCRuRh8LR2bkUacLICc+fiDZ0TloK50A0c=",
         "owner": "input-output-hk",
         "repo": "stackage.nix",
-        "rev": "207b7104d536df29d264047c37500a224dde97bc",
+        "rev": "c84e07a4e0f39f8ddaaa5ea7b2f92aa39e37c9e5",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index ddb9fe6..e975d5e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,7 +38,7 @@
 
         hs-package-name = "with-utf8";
 
-        ghc-versions = [ "884" "8107" "902" "928" "948" "963" "981" ];
+        ghc-versions = [ "8107" "902" "928" "948" "963" "981" "9101" ];
 
         # invoke haskell.nix for each ghc version listed in ghc-versions
         pkgs-per-ghc = lib.genAttrs (map (v: "ghc${v}") ghc-versions)