diff --git a/flake.lock b/flake.lock
index a1d4d7c5..88b85fe8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1692799911,
-        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
         "type": "github"
       },
       "original": {
@@ -20,17 +20,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1692794812,
-        "narHash": "sha256-lEVkjqiIyjAkkWwP2IadNzKur3NpBrvK6g8tJk1r458=",
+        "lastModified": 1703305083,
+        "narHash": "sha256-8xecxMrq4+18tqTuWU/UqP0hYVvCJiODKkTckVIBAoE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "8b5b7def915305c7d4f5cf236c095bf898bc7995",
+        "rev": "54ce5abce7e1531376455c7b32a195329c2587f0",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "8b5b7def915305c7d4f5cf236c095bf898bc7995",
+        "rev": "54ce5abce7e1531376455c7b32a195329c2587f0",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 45c0451a..ebfb0ed5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Higher-order, low-boilerplate free monads.";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/8b5b7def915305c7d4f5cf236c095bf898bc7995";
+    nixpkgs.url = "github:nixos/nixpkgs/54ce5abce7e1531376455c7b32a195329c2587f0";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
@@ -18,16 +18,19 @@
       "92" = hsPkgs nixpkgs "ghc92";
       "94" = hsPkgs nixpkgs "ghc94";
       "96" = hsPkgs nixpkgs "ghc96";
+      "98" = hsPkgs nixpkgs "ghc98";
     };
 
+    default = "96";
+
     mkPackages = version: {
       "polysemy-${version}" = ghcs.${version}.polysemy;
       "polysemy-plugin-${version}" = ghcs.${version}.polysemy-plugin;
     };
 
     defaultPackages = {
-      inherit (ghcs."92") polysemy polysemy-plugin;
-      default = ghcs."92".polysemy;
+      inherit (ghcs.${default}) polysemy polysemy-plugin;
+      default = ghcs.${default}.polysemy;
     };
 
     packages = foldl' (l: r: l // r) defaultPackages (map mkPackages (attrNames ghcs));
@@ -36,7 +39,7 @@
       packages = p: [p.polysemy p.polysemy-plugin];
       buildInputs = with ghc; [
         cabal-install
-      ] ++ nixpkgs.lib.optionals (name != "96") [
+      ] ++ nixpkgs.lib.optionals (name != "98") [
         (ghc.pkgs.haskell.lib.dontCheck ghcid)
         haskell-language-server
       ];
@@ -47,7 +50,7 @@
   in {
     inherit packages;
 
-    devShells = devShells // { default = devShells.ghc92; };
+    devShells = devShells // { default = devShells."ghc${default}"; };
 
     checks = packages;
   });
diff --git a/nix/overlay.nix b/nix/overlay.nix
index 7d0493b1..deac0ae4 100644
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -17,6 +17,28 @@ let
     polysemy-plugin = c2n "polysemy-plugin" ../polysemy-plugin;
   } // pkgs.lib.optionalAttrs (compiler == "ghc96") {
     type-errors = pkgs.haskell.lib.doJailbreak super.type-errors;
+  } // pkgs.lib.optionalAttrs (compiler == "ghc98") {
+    some = pkgs.haskell.lib.doJailbreak super.some;
+    type-errors = pkgs.haskell.lib.doJailbreak super.type-errors;
+    th-abstraction = self.callHackageDirect {
+      pkg = "th-abstraction";
+      ver = "0.6.0.0";
+      sha256 = "1w07ysxrbjm1rhlg9nhlq5y72s5wr4vqmcy99chvyb56wka0grbq";
+    } {};
+    tagged = self.callHackageDirect {
+      pkg = "tagged";
+      ver = "0.8.8";
+      sha256 = "1m2bcf0sr1z28gnl2k8xibcsv80kd35816c9c7ji045jbxg27xd9";
+    } {};
+    hspec = super.hspec_2_11_7;
+    hspec-core = super.hspec-core_2_11_7;
+    hspec-meta = super.hspec-meta_2_11_7;
+    hspec-discover = super.hspec-discover_2_11_7;
+    doctest = self.callHackageDirect {
+      pkg = "doctest";
+      ver = "0.22.2";
+      sha256 = "193vrmxcnn9fxn7bc6y7jg8qwr13z9a26qqn0c294mn67il18cqn";
+    } {};
   };
 in
   pkgs.haskell.packages.${compiler}.override { inherit overrides; } // { inherit pkgs; }