diff --git a/README.md b/README.md
index d336f6b..49e13bd 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,11 @@
 # haskell-template
 
-Haskell project template optimized for a fully reproducible and friendly development environment. Based on [Nix](http://www.srid.ca/haskell-nix) + [Flakes](https://serokell.io/blog/practical-nix-flakes) + VSCode ([HLS](https://github.com/haskell/haskell-language-server)) + [fourmolu](https://github.com/fourmolu/fourmolu) autoformatting + [Relude](https://github.com/kowainik/relude#relude) as Prelude.
+Haskell project template optimized for a fully reproducible and friendly development environment. Based on:
+
+- [Nix](http://www.srid.ca/haskell-nix) + [Flakes](https://serokell.io/blog/practical-nix-flakes) + GHC 9
+- VSCode + [HLS](https://github.com/haskell/haskell-language-server)
+- [fourmolu](https://github.com/fourmolu/fourmolu) autoformatting 
+- [Relude](https://github.com/kowainik/relude#relude) as Prelude.
 
 ## Getting Started
 
diff --git a/flake.lock b/flake.lock
index 9170a8d..89fbc65 100644
--- a/flake.lock
+++ b/flake.lock
@@ -70,17 +70,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1648097358,
-        "narHash": "sha256-GMoTKP/po2Nbkh1tvPvP8Ww6NyFW8FFst1Z3nfzffZc=",
+        "lastModified": 1649225869,
+        "narHash": "sha256-u1zLtPmQzhT9mNXyM8Ey9pk7orDrIKdwooeGDEXm5xM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "4d60081494259c0785f7e228518fee74e0792c1b",
+        "rev": "b6966d911da89e5a7301aaef8b4f0a44c77e103c",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "4d60081494259c0785f7e228518fee74e0792c1b",
+        "rev": "b6966d911da89e5a7301aaef8b4f0a44c77e103c",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 1851537..899b049 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "haskell-template's description";
   inputs = {
     # To find a suitable nixpkgs hash with cache, pick one from https://status.nixos.org/
-    nixpkgs.url = "github:nixos/nixpkgs/4d60081494259c0785f7e228518fee74e0792c1b";
+    nixpkgs.url = "github:nixos/nixpkgs/b6966d911da89e5a7301aaef8b4f0a44c77e103c";
     flake-utils.url = "github:numtide/flake-utils";
     flake-utils.inputs.nixpkgs.follows = "nixpkgs";
     flake-compat.url = "github:edolstra/flake-compat";