diff --git a/default.nix b/default.nix
index a02e909..e4b60bb 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,5 @@
-{ nixpkgs ? import ./nixpkgs-with-ghc843.nix
-, compiler ? "ghc843"
+{ nixpkgs ? import <nixpkgs> {}
+, compiler ? "ghc902"
 }:
 
 nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./my-hakyll-blog.nix { }
diff --git a/example.com-shell.nix b/example.com-shell.nix
index 09fcf14..e647701 100644
--- a/example.com-shell.nix
+++ b/example.com-shell.nix
@@ -1,5 +1,5 @@
-{ nixpkgs ? import ./nixpkgs-with-ghc843.nix
-, compiler ? "ghc843"
+{ nixpkgs ? import <nixpkgs> {}
+, compiler ? "ghc902"
 }:
 
 nixpkgs.mkShell {
diff --git a/flake.lock b/flake.lock
index d7f57a7..4710924 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,19 +16,18 @@
       }
     },
     "nixpkgs": {
-      "flake": false,
       "locked": {
-        "lastModified": 1539028341,
-        "narHash": "sha256-2b+2tvSyuzLYe5zGJ0r9ailbp2NQLwvwpkOWqej5+wc=",
+        "lastModified": 1653738054,
+        "narHash": "sha256-IaR8iLN4Ms3f5EjU1CJkXSc49ZzyS5qv03DtVAti6/s=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a3962299f14944a0e9ccf8fd84bd7be524b74cd6",
+        "rev": "17b62c338f2a0862a58bb6951556beecd98ccda9",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
-        "rev": "a3962299f14944a0e9ccf8fd84bd7be524b74cd6",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 33818f4..fbbe25b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,15 +4,7 @@
   description = "static site generator using hakyll";
 
   inputs = {
-    # A sufficiently old version of nixpkgs such that
-    # it has ghc 8.4.3.
-    #
-    # Details found by using lazamar's nix package versions tool:
-    #   https://lazamar.co.uk/nix-versions/
-    nixpkgs = {
-      url = "github:NixOS/nixpkgs/a3962299f14944a0e9ccf8fd84bd7be524b74cd6";
-      flake = false;
-    };
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
@@ -20,7 +12,7 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = (import nixpkgs { inherit system; }).pkgs;
-        compiler = "ghc843";
+        compiler = "ghc902";
       in rec {
         packages.my-hakyll-blog =
           pkgs.haskell.packages.${compiler}.callPackage ./my-hakyll-blog.nix { };
diff --git a/nixpkgs-with-ghc843.nix b/nixpkgs-with-ghc843.nix
deleted file mode 100644
index bfc33cd..0000000
--- a/nixpkgs-with-ghc843.nix
+++ /dev/null
@@ -1,11 +0,0 @@
-# A sufficiently old version of nixpkgs such that
-# it has ghc 8.4.3.
-#
-# Details found by using lazamar's nix package versions tool:
-#   https://lazamar.co.uk/nix-versions/
-import (builtins.fetchGit {
-  name = "nixpkgs-with-ghc-8_4_3-a396";
-  url = "https://github.com/NixOS/nixpkgs/";
-  ref = "refs/heads/nixpkgs-unstable";
-  rev = "a3962299f14944a0e9ccf8fd84bd7be524b74cd6";
-}) {}
diff --git a/shell.nix b/shell.nix
index 28e415b..6bf03ab 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,5 +1,5 @@
-{ nixpkgs ? import ./nixpkgs-with-ghc843.nix
-, compiler ? "ghc843"
+{ nixpkgs ? import <nixpkgs> {}
+, compiler ? "ghc902"
 }:
 
 (import ./default.nix { inherit nixpkgs compiler; }).env
diff --git a/stack-shell.nix b/stack-shell.nix
index 3e29151..11e1c3c 100644
--- a/stack-shell.nix
+++ b/stack-shell.nix
@@ -1,5 +1,5 @@
-{ nixpkgs ? import ./nixpkgs-with-ghc843.nix
-, compiler ? "ghc843"
+{ nixpkgs ? import <nixpkgs> {}
+, compiler ? "ghc902"
 }:
 
 nixpkgs.mkShell {
diff --git a/stack.yaml.lock b/stack.yaml.lock
new file mode 100644
index 0000000..75bb9d2
--- /dev/null
+++ b/stack.yaml.lock
@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 504336
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/12/12.yaml
+    sha256: 11db5c37144d13fe6b56cd511050b4e6ffe988f6edb8e439c2432fc9fcdf50c3
+  original: lts-12.12