diff --git a/dex.cabal b/dex.cabal
index 6a5090c5c..a3b8dc8bf 100644
--- a/dex.cabal
+++ b/dex.cabal
@@ -91,7 +91,6 @@ library
                      , megaparsec
                      , parser-combinators
                        -- Text output
-                     -- , prettyprinter
                      , text
                        -- Portable system utilities
                      , directory
@@ -103,8 +102,6 @@ library
                      , aeson
                      , store
                      , time
-                       -- Floating-point pedanticness (correcting for GHC < 9.2.2)
-                     , floating-bits
                      , binary
                      , blaze-html
                      , blaze-markup
@@ -209,7 +206,6 @@ executable dex
                      , haskeline
                      , mtl
                      , optparse-applicative
-                     -- , prettyprinter
                      , store
                      , text
                      , unix
diff --git a/src/lib/ConcreteSyntax.hs b/src/lib/ConcreteSyntax.hs
index 983e6897e..8946b5812 100644
--- a/src/lib/ConcreteSyntax.hs
+++ b/src/lib/ConcreteSyntax.hs
@@ -11,6 +11,7 @@ module ConcreteSyntax (
   finishUModuleParse, preludeImportBlock, mustParseSourceBlock,
   pattern Identifier) where
 
+import Control.Monad
 import Control.Monad.Combinators.Expr qualified as Expr
 import Control.Monad.Reader
 import Data.Char
diff --git a/src/lib/Lexing.hs b/src/lib/Lexing.hs
index 9d936851d..118d63f06 100644
--- a/src/lib/Lexing.hs
+++ b/src/lib/Lexing.hs
@@ -6,6 +6,7 @@
 
 module Lexing where
 
+import Control.Monad
 import Control.Monad.State.Strict
 import Data.Char
 import Data.HashSet qualified as HS
diff --git a/src/lib/Name.hs b/src/lib/Name.hs
index 86bb1e08f..21c3f0367 100644
--- a/src/lib/Name.hs
+++ b/src/lib/Name.hs
@@ -16,6 +16,7 @@ module Name
 import Prelude hiding (id, (.))
 import Control.Category
 import Control.Applicative
+import Control.Monad
 import Control.Monad.Identity
 import Control.Monad.Except hiding (Except)
 import Control.Monad.Reader
@@ -1256,8 +1257,8 @@ instance (ScopeReader m, ScopeExtender m)
 instance (Monad1 m, ScopeReader m, ScopeExtender m, Fallible1 m)
          => ZipSubstReader (ZipSubstReaderT m) where
 
-  lookupZipSubstFst v = ZipSubstReaderT $ (!v) <$> fst <$> ask
-  lookupZipSubstSnd v = ZipSubstReaderT $ (!v) <$> snd <$> ask
+  lookupZipSubstFst v = ZipSubstReaderT $ (! v) <$> fst <$> ask
+  lookupZipSubstSnd v = ZipSubstReaderT $ (! v) <$> snd <$> ask
 
   extendZipSubstFst frag (ZipSubstReaderT cont) = ZipSubstReaderT $ withReaderT (onFst (<>>frag)) cont
   extendZipSubstSnd frag (ZipSubstReaderT cont) = ZipSubstReaderT $ withReaderT (onSnd (<>>frag)) cont
diff --git a/src/lib/SourceRename.hs b/src/lib/SourceRename.hs
index 4e2d0979d..05694dc1c 100644
--- a/src/lib/SourceRename.hs
+++ b/src/lib/SourceRename.hs
@@ -10,6 +10,7 @@ module SourceRename ( renameSourceNames ) where
 
 import Prelude hiding (id, (.))
 import Control.Category
+import Control.Monad
 import Control.Monad.Reader
 import Control.Monad.State.Strict
 import qualified Data.Set        as S
diff --git a/src/lib/Subst.hs b/src/lib/Subst.hs
index 6b9a3cd99..6695cd9c0 100644
--- a/src/lib/Subst.hs
+++ b/src/lib/Subst.hs
@@ -29,7 +29,7 @@ class (SinkableE v, Monad2 m) => SubstReader (v::E) (m::MonadKind2) | m -> v whe
    withSubst :: Subst v i' o -> m i' o a -> m i o a
 
 lookupSubstM :: SubstReader v m => Name i -> m i o (v o)
-lookupSubstM name = (!name) <$> getSubst
+lookupSubstM name = (! name) <$> getSubst
 
 dropSubst :: (SubstReader v m, FromName v) => m o o a -> m i o a
 dropSubst cont = withSubst idSubst cont
diff --git a/src/lib/Util.hs b/src/lib/Util.hs
index 2bb1504e7..03b545329 100644
--- a/src/lib/Util.hs
+++ b/src/lib/Util.hs
@@ -12,6 +12,7 @@ import Prelude
 import qualified Data.Set as Set
 import qualified Data.Map.Strict as M
 import Control.Applicative
+import Control.Monad
 import Control.Monad.Reader
 import Control.Monad.State.Strict
 import System.CPUTime
diff --git a/stack.yaml b/stack.yaml
index bf9cce344..d69ff4c41 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -4,36 +4,13 @@
 # license that can be found in the LICENSE file or at
 # https://developers.google.com/open-source/licenses/bsd
 
-resolver: lts-18.23
-
-packages:
-- .
-
-extra-deps:
-  - github: llvm-hs/llvm-hs
-    commit: 423220bffac4990d019fc088c46c5f25310d5a33
-    subdirs:
-      - llvm-hs
-      - llvm-hs-pure
-  - megaparsec-8.0.0
-  - prettyprinter-1.6.2
-  - store-0.7.8@sha256:0b604101fd5053b6d7d56a4ef4c2addf97f4e08fe8cd06b87ef86f958afef3ae,8001
-  - store-core-0.4.4.4@sha256:a19098ca8419ea4f6f387790e942a7a5d0acf62fe1beff7662f098cfb611334c,1430
-  - th-utilities-0.2.4.1@sha256:b37d23c8bdabd678aee5a36dd4373049d4179e9a85f34eb437e9cd3f04f435ca,1869
-  - floating-bits-0.3.0.0@sha256:742bcfcbc21b8daffc995990ee2399ab49550e8f4dd0dff1732d18f57a064c83,2442
-
-nix:
-  enable: false
-  packages: [ libpng llvm_12 pkg-config zlib ]
+resolver: lts-22.42
 
 ghc-options:
   containers: -fno-prof-auto -O2
   hashable: -fno-prof-auto -O2
-  llvm-hs-pure: -fno-prof-auto -O2
-  llvm-hs: -fno-prof-auto -O2
   megaparsec: -fno-prof-auto -O2
   parser-combinators: -fno-prof-auto -O2
-  prettyprinter: -fno-prof-auto -O2
   store-core: -fno-prof-auto -O2
   store: -fno-prof-auto -O2
   unordered-containers: -fno-prof-auto -O2