diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,15 @@
+0.10.10.0:
+
+  Allow building with base version 4.22 (GHC 9.12).
+
+  The -v flag for Swish now includes the GHC version and
+  platform information.
+
+  Removed a number of old stack files for testing out older
+  versions, as I do not have the time to support them, and
+  some were known to fail due to changes in the Haskell
+  ecosystem.
+
 0.10.9.0:
 
   Allow building with hashable version 1.5.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,7 +1,6 @@
 
 [![Hackage](https://img.shields.io/hackage/v/swish.svg)](https://hackage.haskell.org/package/swish)
 [![Pipeline status](https://gitlab.com/dburke/swish/badges/main/pipeline.svg)](https://gitlab.com/dburke/swish/-/commits/main)
-[![Dependencies status](https://img.shields.io/hackage-deps/v/swish.svg)](http://packdeps.haskellers.com/feed?needle=swish)
 
 # Introduction
 
@@ -82,6 +81,8 @@
 
     % cd swish
     % stack install
+    % STACK_YAML=stack-9.10.yaml stack install   # this uses a nightly install
+    % STACK_YAML=stack-9.8.yaml stack install
     % STACK_YAML=stack-9.6.yaml stack install
     % STACK_YAML=stack-9.4.yaml stack install
     % STACK_YAML=stack-9.2.yaml stack install
@@ -89,10 +90,6 @@
     % STACK_YAML=stack-8.10.yaml stack install
     % STACK_YAML=stack-8.8.yaml stack install
     % STACK_YAML=stack-8.6.yaml stack install
-    % STACK_YAML=stack-8.4.yaml stack install
-    % STACK_YAML=stack-8.2.yaml stack install
-    % STACK_YAML=stack-8.0.yaml stack install
-    % STACK_YAML=stack-7.10.yaml stack install
 
 I do not guarantee they will all work.
 
diff --git a/app/SwishApp.hs b/app/SwishApp.hs
--- a/app/SwishApp.hs
+++ b/app/SwishApp.hs
@@ -3,7 +3,7 @@
 --------------------------------------------------------------------------------
 -- |
 --  Module      :  SwishApp
---  Copyright   :  (c) 2003, Graham Klyne, 2009 Vasili I Galchin, 2011 Douglas Burke
+--  Copyright   :  (c) 2003, Graham Klyne, 2009 Vasili I Galchin, 2011, 2024 Douglas Burke
 --  License     :  GPL V2
 --
 --  Maintainer  :  Douglas Burke
@@ -16,6 +16,8 @@
 
 module Main where
 
+import qualified System.Info as SI
+
 import Paths_swish (version)
 import Data.Version (showVersion)
 
@@ -63,11 +65,15 @@
                  >> exitWith (ExitFailure $ fromEnum code)
   
 displayVersion :: IO ()
-displayVersion = putStrLn $ "Swish " ++ showVersion version 
+displayVersion =
+  let msg = "Swish " <> showVersion version <> " (" <>
+        SI.compilerName <> " " <> showVersion SI.fullCompilerVersion <>
+        " " <> SI.os <> " " <> SI.arch <> ")"
+  in putStrLn msg
   
 --------------------------------------------------------------------------------
 --
---  Copyright (c) 2003, Graham Klyne, 2009 Vasili I Galchin, 2011 Douglas Burke  
+--  Copyright (c) 2003, Graham Klyne, 2009 Vasili I Galchin, 2011, 2024 Douglas Burke
 --  All rights reserved.
 --
 --  This file is part of Swish.
diff --git a/default.nix b/default.nix
--- a/default.nix
+++ b/default.nix
@@ -1,4 +1,4 @@
-{ compiler ? "ghc902"
+{ compiler ? "ghc966"
 }:
 
 (import ./release.nix { compiler = compiler; }).exe
diff --git a/flake.lock b/flake.lock
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1720181791,
-        "narHash": "sha256-i4vJL12/AdyuQuviMMd1Hk2tsGt02hDNhA0Zj1m16N8=",
+        "lastModified": 1734435836,
+        "narHash": "sha256-kMBQ5PRiFLagltK0sH+08aiNt3zGERC2297iB6vrvlU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4284c2b73c8bce4b46a6adf23e16d9e2ec8da4bb",
+        "rev": "4989a246d7a390a859852baddb1013f825435cee",
         "type": "github"
       },
       "original": {
diff --git a/shell.nix b/shell.nix
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
-{ compiler ? "ghc902"
+{ compiler ? "ghc966"
 }:
 
 (import ./release.nix { compiler = compiler; }).shell
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -2,4 +2,4 @@
 packages:
 - '.'
 # Match the version used in .gitlab-ci.yml
-resolver: lts-19.19
+resolver: lts-23.1
diff --git a/swish.cabal b/swish.cabal
--- a/swish.cabal
+++ b/swish.cabal
@@ -1,13 +1,13 @@
 Cabal-Version:      2.4
 
 Name:               swish
-Version:            0.10.9.0
+Version:            0.10.10.0
 Stability:          experimental
 License:            LGPL-2.1-or-later
 License-file:       LICENSE 
 Author:             Graham Klyne - GK@ninebynine.org
 Copyright:          (c) 2003, 2004 G. Klyne; 2009 Vasili I Galchin; 2011 - 2024 Doug Burke; All rights reserved.
-Maintainer:         dburke@cfa.harvard.edu
+Maintainer:         dburke.gw@gmail.com
 Category:           Semantic Web
 Synopsis:           A semantic web toolkit. 
 
@@ -97,7 +97,7 @@
 Library
    Default-Language:    Haskell2010
    Build-Depends:
-      base >= 4.8 && < 4.21,
+      base >= 4.8 && < 4.22,
       containers >= 0.5 && < 0.8,
       directory >= 1.0 && < 1.4,
       filepath >= 1.1 && < 1.6,