diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 0301e446..13e958bd 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -34,7 +34,6 @@ jobs:
     strategy:
       matrix:
         versions:
-          - release: 'release-8.10.nix'
           - release: 'release-9.0.nix'
           - release: 'release-9.2.nix'
     steps:
@@ -46,14 +45,14 @@ jobs:
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
     - run: |
         nix-build --keep-going \
-        -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-21.11 \
+        -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-22.05 \
         ${{ matrix.versions.release }} \
         --arg packages "haskellPackages: [ haskellPackages.ihaskell ]"
     # release-9.2.nix doesn't include HLint support so the test fails
     - if: ${{ matrix.versions.release != 'release-9.2.nix' }}
       run: |
         nix-shell \
-        -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-21.11 \
+        -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-22.05 \
         -p jq --run \
         'test/acceptance.nbconvert.sh result/bin/jupyter nbconvert'
 
diff --git a/release-8.10.nix b/release-8.10.nix
deleted file mode 100644
index 0f408db7..00000000
--- a/release-8.10.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-{ compiler ? "ghc8107"
-, nixpkgs ? import <nixpkgs> {}
-, packages ? (_: [])
-, pythonPackages ? (_: [])
-, rtsopts ? "-M3g -N2"
-, staticExecutable ? false
-, systemPackages ? (_: [])
-}:
-  import (./release.nix) { inherit compiler nixpkgs packages pythonPackages rtsopts systemPackages; }
diff --git a/release-9.0.nix b/release-9.0.nix
index b6042d31..a4c0069e 100644
--- a/release-9.0.nix
+++ b/release-9.0.nix
@@ -1,11 +1,5 @@
-let
-  nixpkgs-src = builtins.fetchTarball {
-    url = "https://github.com/NixOS/nixpkgs/tarball/4869c88626382a01ed59b161afe99d9e164bd8a1";
-    sha256 = "03ncnw0p28j5jsp5dh66jl003x81jhkh2larwkq3fvsbkai4x0kn";
-  };
-in
-{ compiler ? "ghc901"
-, nixpkgs ? import nixpkgs-src {}
+{ compiler ? "ghc902"
+, nixpkgs ? import <nixpkgs> {}
 , packages ? (_: [])
 , pythonPackages ? (_: [])
 , rtsopts ? "-M3g -N2"
diff --git a/release-9.2.nix b/release-9.2.nix
index 20d41c7e..7b57f16b 100644
--- a/release-9.2.nix
+++ b/release-9.2.nix
@@ -1,114 +1,9 @@
-let
-  # https://github.com/NixOS/nixpkgs/pull/144758
-  nixpkgs-src = builtins.fetchTarball {
-    url = "https://github.com/NixOS/nixpkgs/tarball/207243f7c9ca642af5c7f6bc0e7dcbd32890b411";
-    sha256 = "099311cml687zm3mi9pqabd5c46nl2ydg2akidfj4a2w59pl39kn";
-  };
-in
-
-{ compiler ? "ghc921"
-, nixpkgs ? import nixpkgs-src {}
+{ compiler ? "ghc922"
+, nixpkgs ? import <nixpkgs> {}
 , packages ? (_: [])
 , pythonPackages ? (_: [])
 , rtsopts ? "-M3g -N2"
 , staticExecutable ? false
 , systemPackages ? (_: [])
 }:
-
-let
-  ihaskell-src = nixpkgs.nix-gitignore.gitignoreSource
-    [ "**/*.ipynb" "**/*.nix" "**/*.yaml" "**/*.yml" "**/\.*" "/Dockerfile" "/README.md" "/cabal.project" "/images" "/notebooks" "/requirements.txt" ]
-    ./.;
-  displays = self: builtins.listToAttrs (
-    map
-      (display: { name = "ihaskell-${display}"; value = self.callCabal2nix display "${ihaskell-src}/ihaskell-display/ihaskell-${display}" {}; })
-      [ "aeson" "blaze" "charts" "diagrams" "gnuplot" "graphviz" "hatex" "juicypixels" "magic" "plot" "rlangqq" "static-canvas" "widgets" ]);
-  haskellPackages = nixpkgs.haskell.packages."${compiler}".override (old: {
-    overrides = nixpkgs.lib.composeExtensions (old.overrides or (_: _: {})) (self: super: {
-      ihaskell          = (nixpkgs.haskell.lib.overrideCabal (
-                          self.callCabal2nix "ihaskell" ihaskell-src {}) (_drv: {
-        preCheck = ''
-          export HOME=$TMPDIR/home
-          export PATH=$PWD/dist/build/ihaskell:$PATH
-          export GHC_PACKAGE_PATH=$PWD/dist/package.conf.inplace/:$GHC_PACKAGE_PATH
-        '';
-        configureFlags = (old.configureFlags or []) ++ [ "-f" "-use-hlint" ];
-      })).overrideScope (self: super: {
-        hlint = null;
-      });
-      ghc-parser        = self.callCabal2nix "ghc-parser" ./ghc-parser {};
-      ipython-kernel    = self.callCabal2nix "ipython-kernel" ./ipython-kernel {};
-
-      aeson = super.aeson_2_0_1_0;
-    } // displays self);
-  });
-  # statically linking against haskell libs reduces closure size at the expense
-  # of startup/reload time, so we make it configurable
-  ihaskellExe = if staticExecutable
-    then nixpkgs.haskell.lib.justStaticExecutables haskellPackages.ihaskell
-    else nixpkgs.haskell.lib.enableSharedExecutables haskellPackages.ihaskell;
-  ihaskellEnv = haskellPackages.ghcWithPackages packages;
-  jupyterlab = nixpkgs.python3.withPackages (ps: [ ps.jupyterlab ] ++ pythonPackages ps);
-  ihaskellGhcLibFunc = exe: env: nixpkgs.writeShellScriptBin "ihaskell" ''
-    ${exe}/bin/ihaskell -l $(${env}/bin/ghc --print-libdir) "$@"
-  '';
-  ihaskellKernelFileFunc = ihaskellGhcLib: rtsopts: {
-    display_name = "Haskell";
-    argv = [
-      "${ihaskellGhcLib}/bin/ihaskell"
-      "kernel"
-      "{connection_file}"
-      "+RTS"
-    ] ++ (nixpkgs.lib.splitString " " rtsopts) ++ [
-      "-RTS"
-    ];
-    language = "haskell";
-  };
-  ihaskellKernelSpecFunc = ihaskellKernelFile: nixpkgs.runCommand "ihaskell-kernel" {} ''
-    export kerneldir=$out/kernels/haskell
-    mkdir -p $kerneldir
-    cp ${./html}/* $kerneldir
-    echo '${builtins.toJSON ihaskellKernelFile}' > $kerneldir/kernel.json
-  '';
-  ihaskellLabextension = nixpkgs.runCommand "ihaskell-labextension" {} ''
-    mkdir -p $out/labextensions/
-    ln -s ${./jupyterlab-ihaskell/labextension} $out/labextensions/jupyterlab-ihaskell
-  '';
-  ihaskellDataDirFunc = ihaskellKernelSpec: ihaskellLabextension: nixpkgs.buildEnv {
-    name = "ihaskell-data-dir";
-    paths = [ ihaskellKernelSpec ihaskellLabextension ];
-  };
-  ihaskellBuildEnvFunc = { ihaskellEnv, jupyterlab, systemPackages, ihaskellDataDir }: nixpkgs.buildEnv {
-    name = "ihaskell-with-packages";
-    buildInputs = [ nixpkgs.makeWrapper ];
-    paths = [ ihaskellEnv jupyterlab ];
-    postBuild = ''
-      for prg in $out/bin"/"*;do
-        if [[ -f $prg && -x $prg ]]; then
-          wrapProgram $prg \
-            --prefix PATH : "${nixpkgs.lib.makeBinPath ([ihaskellEnv] ++ (systemPackages nixpkgs))}" \
-            --prefix JUPYTER_PATH : "${ihaskellDataDir}"
-        fi
-      done
-    '';
-    passthru = {
-      inherit haskellPackages;
-      inherit ihaskellExe;
-      inherit ihaskellEnv;
-      inherit ihaskellLabextension;
-      inherit jupyterlab;
-      inherit ihaskellGhcLibFunc;
-      inherit ihaskellKernelFileFunc;
-      inherit ihaskellKernelSpecFunc;
-      inherit ihaskellDataDirFunc;
-      inherit ihaskellBuildEnvFunc;
-    };
-  };
-in ihaskellBuildEnvFunc {
-  inherit ihaskellEnv jupyterlab systemPackages;
-  ihaskellDataDir = let
-    ihaskellGhcLib =  ihaskellGhcLibFunc ihaskellExe ihaskellEnv;
-    ihaskellKernelFile = ihaskellKernelFileFunc ihaskellGhcLib rtsopts;
-    ihaskellKernelSpec = ihaskellKernelSpecFunc ihaskellKernelFile;
-  in ihaskellDataDirFunc ihaskellKernelSpec ihaskellLabextension;
-}
+  import (./release.nix) { inherit compiler nixpkgs packages pythonPackages rtsopts systemPackages; }