diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51656bd..4ef95f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# hpqtypes-1.12.1.0 (????-??-??)
+* Switch from `readline` to `haskeline`, to make example compile with newer
+  Cabal versions.
+
 # hpqtypes-1.12.0.0 (2024-03-18)
 * Drop support for GHC 8.8.
 * Attach `CallStack` and `BackendPid` to `DBException`.
diff --git a/examples/Catalog.hs b/examples/Catalog.hs
index 2501ef7..5ef5d57 100644
--- a/examples/Catalog.hs
+++ b/examples/Catalog.hs
@@ -4,14 +4,14 @@ import Control.Arrow (second)
 import Control.Monad
 import Control.Monad.Base
 import Control.Monad.Catch
-import Data.Function
+import Control.Monad.IO.Class (liftIO)
 import Data.Int
 import Data.Monoid.Utils
 import Data.Pool
 import Data.Text qualified as T
 import Database.PostgreSQL.PQTypes
 import Database.PostgreSQL.PQTypes.Internal.Utils (mread)
-import System.Console.Readline
+import System.Console.Haskeline
 import System.Environment
 
 -- | Generic 'putStrLn'.
@@ -144,13 +144,14 @@ catalog = do
   cs <- getConnSettings
   withCatalog cs $ do
     ConnectionSource pool <- poolSource (cs {csComposites = ["book_"]}) (\connect disconnect -> defaultPoolConfig connect disconnect 1 10)
-    fix $ \next ->
-      readline "> "
+    runInputT defaultSettings (loop pool)
+  where
+    loop pool = do
+      getInputLine "> "
         >>= maybe
-          (printLn "")
+          (outputStrLn "")
           ( \cmd -> do
               when (cmd /= "quit") $ do
-                processCommand pool cmd
-                addHistory cmd
-                next
+                liftIO $ processCommand pool cmd
+                loop pool
           )
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..4ca0379
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,436 @@
+{
+  "nodes": {
+    "HTTP": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1451647621,
+        "narHash": "sha256-oHIyw3x0iKBexEo49YeUDV1k74ZtyYKGR2gNJXXRxts=",
+        "owner": "phadej",
+        "repo": "HTTP",
+        "rev": "9bc0996d412fef1787449d841277ef663ad9a915",
+        "type": "github"
+      },
+      "original": {
+        "owner": "phadej",
+        "repo": "HTTP",
+        "type": "github"
+      }
+    },
+    "cabal-32": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1603716527,
+        "narHash": "sha256-X0TFfdD4KZpwl0Zr6x+PLxUt/VyKQfX7ylXHdmZIL+w=",
+        "owner": "haskell",
+        "repo": "cabal",
+        "rev": "48bf10787e27364730dd37a42b603cee8d6af7ee",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "3.2",
+        "repo": "cabal",
+        "type": "github"
+      }
+    },
+    "cabal-34": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1640353650,
+        "narHash": "sha256-N1t6M3/wqj90AEdRkeC8i923gQYUpzSr8b40qVOZ1Rk=",
+        "owner": "haskell",
+        "repo": "cabal",
+        "rev": "942639c18c0cd8ec53e0a6f8d120091af35312cd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "3.4",
+        "repo": "cabal",
+        "type": "github"
+      }
+    },
+    "cabal-36": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1641652457,
+        "narHash": "sha256-BlFPKP4C4HRUJeAbdembX1Rms1LD380q9s0qVDeoAak=",
+        "owner": "haskell",
+        "repo": "cabal",
+        "rev": "f27667f8ec360c475027dcaee0138c937477b070",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "ref": "3.6",
+        "repo": "cabal",
+        "type": "github"
+      }
+    },
+    "cardano-shell": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1608537748,
+        "narHash": "sha256-PulY1GfiMgKVnBci3ex4ptk2UNYMXqGjJOxcPy2KYT4=",
+        "owner": "input-output-hk",
+        "repo": "cardano-shell",
+        "rev": "9392c75087cb9a3d453998f4230930dea3a95725",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "cardano-shell",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1649676176,
+        "narHash": "sha256-OWKJratjt2RW151VUlJPRALb7OU2S5s+f0vLj4o1bHM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a4b154ebbdc88c8498a5c7b01589addc9e9cb678",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1644229661,
+        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "ghc-8.6.5-iohk": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1600920045,
+        "narHash": "sha256-DO6kxJz248djebZLpSzTGD6s8WRpNI9BTwUeOf5RwY8=",
+        "owner": "input-output-hk",
+        "repo": "ghc",
+        "rev": "95713a6ecce4551240da7c96b6176f980af75cae",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "ref": "release/8.6.5-iohk",
+        "repo": "ghc",
+        "type": "github"
+      }
+    },
+    "hackage": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1651799820,
+        "narHash": "sha256-0PRQy06YsOJj7JDoF3dLJS6vbay34G56Rnwtqt2suh0=",
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "rev": "9db71bdb5ade587ee5ce741c44c4945ba9153eb7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "hackage.nix",
+        "type": "github"
+      }
+    },
+    "haskellNix": {
+      "inputs": {
+        "HTTP": "HTTP",
+        "cabal-32": "cabal-32",
+        "cabal-34": "cabal-34",
+        "cabal-36": "cabal-36",
+        "cardano-shell": "cardano-shell",
+        "flake-utils": "flake-utils_2",
+        "ghc-8.6.5-iohk": "ghc-8.6.5-iohk",
+        "hackage": "hackage",
+        "hpc-coveralls": "hpc-coveralls",
+        "hydra": "hydra",
+        "nix-tools": "nix-tools",
+        "nixpkgs": [
+          "haskellNix",
+          "nixpkgs-unstable"
+        ],
+        "nixpkgs-2003": "nixpkgs-2003",
+        "nixpkgs-2105": "nixpkgs-2105",
+        "nixpkgs-2111": "nixpkgs-2111",
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "old-ghc-nix": "old-ghc-nix",
+        "stackage": "stackage"
+      },
+      "locked": {
+        "lastModified": 1651799960,
+        "narHash": "sha256-6CJJGThV8pdt56SGGR6vpwCYEmAUMRuWD2VyFHl8YcQ=",
+        "owner": "input-output-hk",
+        "repo": "haskell.nix",
+        "rev": "6c9b72f47d4881d9a1038447ece7f5260a8463e1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "haskell.nix",
+        "type": "github"
+      }
+    },
+    "hpc-coveralls": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1607498076,
+        "narHash": "sha256-8uqsEtivphgZWYeUo5RDUhp6bO9j2vaaProQxHBltQk=",
+        "owner": "sevanspowell",
+        "repo": "hpc-coveralls",
+        "rev": "14df0f7d229f4cd2e79f8eabb1a740097fdfa430",
+        "type": "github"
+      },
+      "original": {
+        "owner": "sevanspowell",
+        "repo": "hpc-coveralls",
+        "type": "github"
+      }
+    },
+    "hydra": {
+      "inputs": {
+        "nix": "nix",
+        "nixpkgs": [
+          "haskellNix",
+          "hydra",
+          "nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1646878427,
+        "narHash": "sha256-KtbrofMtN8GlM7D+n90kixr7QpSlVmdN+vK5CA/aRzc=",
+        "owner": "NixOS",
+        "repo": "hydra",
+        "rev": "28b682b85b7efc5cf7974065792a1f22203a5927",
+        "type": "github"
+      },
+      "original": {
+        "id": "hydra",
+        "type": "indirect"
+      }
+    },
+    "lowdown-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1633514407,
+        "narHash": "sha256-Dw32tiMjdK9t3ETl5fzGrutQTzh2rufgZV4A/BbxuD4=",
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "rev": "d2c2b44ff6c27b936ec27358a2653caaef8f73b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kristapsdz",
+        "repo": "lowdown",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "lowdown-src": "lowdown-src",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-regression": "nixpkgs-regression"
+      },
+      "locked": {
+        "lastModified": 1643066034,
+        "narHash": "sha256-xEPeMcNJVOeZtoN+d+aRwolpW8mFSEQx76HTRdlhPhg=",
+        "owner": "NixOS",
+        "repo": "nix",
+        "rev": "a1cd7e58606a41fcf62bf8637804cf8306f17f62",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "2.6.0",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nix-tools": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1649424170,
+        "narHash": "sha256-XgKXWispvv5RCvZzPb+p7e6Hy3LMuRjafKMl7kXzxGw=",
+        "owner": "input-output-hk",
+        "repo": "nix-tools",
+        "rev": "e109c94016e3b6e0db7ed413c793e2d4bdb24aa7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "nix-tools",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1632864508,
+        "narHash": "sha256-d127FIvGR41XbVRDPVvozUPQ/uRHbHwvfyKHwEt5xFM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "82891b5e2c2359d7e58d08849e4c89511ab94234",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-21.05-small",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-2003": {
+      "locked": {
+        "lastModified": 1620055814,
+        "narHash": "sha256-8LEHoYSJiL901bTMVatq+rf8y7QtWuZhwwpKE2fyaRY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1db42b7fe3878f3f5f7a4f2dc210772fd080e205",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-20.03-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2105": {
+      "locked": {
+        "lastModified": 1645296114,
+        "narHash": "sha256-y53N7TyIkXsjMpOG7RhvqJFGDacLs9HlyHeSTBioqYU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "530a53dcbc9437363471167a5e4762c5fcfa34a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-21.05-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2111": {
+      "locked": {
+        "lastModified": 1648744337,
+        "narHash": "sha256-bYe1dFJAXovjqiaPKrmAbSBEK5KUkgwVaZcTbSoJ7hg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0a58eebd8ec65ffdef2ce9562784123a73922052",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-21.11-darwin",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-2111_2": {
+      "locked": {
+        "lastModified": 1651782292,
+        "narHash": "sha256-B5+NeGRg3oFlFD3uAlN4RSKqi7odl4wIurfPH3WfpDk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "20e362cadde27cd26e601d73ac20ecc856577a05",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1648219316,
+        "narHash": "sha256-Ctij+dOi0ZZIfX5eMhgwugfvB+WZSrvVNAyAuANOsnQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "30d3d79b7d3607d56546dd2a6b49e156ba0ec634",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "old-ghc-nix": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1631092763,
+        "narHash": "sha256-sIKgO+z7tj4lw3u6oBZxqIhDrzSkvpHtv0Kki+lh9Fg=",
+        "owner": "angerman",
+        "repo": "old-ghc-nix",
+        "rev": "af48a7a7353e418119b6dfe3cd1463a657f342b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "angerman",
+        "ref": "master",
+        "repo": "old-ghc-nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "haskellNix": "haskellNix",
+        "nixpkgs": [
+          "haskellNix",
+          "nixpkgs-unstable"
+        ],
+        "nixpkgs-2111": "nixpkgs-2111_2"
+      }
+    },
+    "stackage": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1651799909,
+        "narHash": "sha256-O7s14Kl4Je7nwJcrt4Y8UhR0wNFteoMKNeLXj9rz9aQ=",
+        "owner": "input-output-hk",
+        "repo": "stackage.nix",
+        "rev": "900cc0efd1c773095c39d14454f82ef6f367bebd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "stackage.nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..980f713
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,39 @@
+{
+  description = "hpqtypes-extras";
+
+  inputs.nixpkgs-2111.url = "github:NixOS/nixpkgs/release-21.11";
+  inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
+  inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils, haskellNix, ... }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+      let
+        overlay = self: _: {
+          hsPkgs = self.haskell-nix.project' rec {
+            src = ./.;
+            compiler-nix-name = "ghc8107";
+            shell = {
+              tools = {
+                # brittany = { };
+                cabal = { };
+                ghcid = { };
+                haskell-language-server = { };
+                hlint = { };
+                hoogle = { };
+                # stylish-haskell = { };
+                tasty-discover = { };
+              };
+
+              # Non-Haskell shell tools.
+              buildInputs = with pkgs; [ pkgconfig ];
+            };
+          };
+        };
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ haskellNix.overlay overlay ];
+        };
+        flake = pkgs.hsPkgs.flake { };
+      in flake);
+}
diff --git a/hpqtypes.cabal b/hpqtypes.cabal
index f0ca0b9..3ac626f 100644
--- a/hpqtypes.cabal
+++ b/hpqtypes.cabal
@@ -197,7 +197,7 @@ test-suite hpqtypes-tests
                      , monad-control >= 1.0.3
                      , mtl >= 2.1
                      , random >= 1.0
-                     , readline >= 1.0.3.0
+                     , haskeline >= 0.8.2.1
                      , resource-pool >= 0.4
                      , scientific
                      , test-framework >= 0.8