diff --git a/image-triangles.cabal b/image-triangles.cabal
index eb8206f..debe9e6 100644
--- a/image-triangles.cabal
+++ b/image-triangles.cabal
@@ -1,9 +1,10 @@
-cabal-version:       3.4
+cabal-version:      3.4
+
 -- Initial image-triangles.cabal generated by cabal init.  For further
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 -- The name of the package.
-name:                image-triangles
+name:               image-triangles
 
 -- The package version.  See the Haskell package versioning policy (PVP)
 -- for standards guiding when and how versions should be incremented.
@@ -11,7 +12,7 @@ name:                image-triangles
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.1.0.0
+version:            0.1.0.0
 
 -- A short (one-line) description of the package.
 -- synopsis:
@@ -20,89 +21,88 @@ version:             0.1.0.0
 -- description:
 
 -- The license under which the package is released.
-license:             BSD-3-Clause
+license:            BSD-3-Clause
 
 -- The file containing the license text.
-license-file:        LICENSE
+license-file:       LICENSE
 
 -- The package author(s).
-author:              Jack Wines
+author:             Jack Wines
 
 -- An email address to which users can send suggestions, bug reports, and
 -- patches.
-maintainer:          jackwines@mac.com
+maintainer:         jackwines@mac.com
 
 -- A copyright notice.
 -- copyright:
 
 -- category:
 
-build-type:          Simple
+build-type:         Simple
 
 -- Extra files to be distributed with the package, such as examples or a
 -- README.
-extra-source-files:  README.md
-
-
+extra-source-files: README.md
 
 executable image-triangles
   -- .hs or .lhs file containing the Main module.
-  main-is:             Main.hs
+  main-is:            Main.hs
 
   -- Modules included in this executable, other than Main.
-  other-modules: Triangles, MinDistanceSample
+  other-modules:
+    MinDistanceSample
+    Triangles
 
   -- LANGUAGE extensions used by modules in this package.
-  default-extensions:  ScopedTypeVariables,
-                       OverloadedStrings,
-                       TemplateHaskell,
-                       DataKinds,
-                       DeriveAnyClass,
-                       FlexibleContexts,
-                       FlexibleInstances,
-                       MultiParamTypeClasses,
-                       OverloadedLabels,
-                       TypeFamilies,
-                       TypeOperators,
-                       TupleSections,
-                       DeriveGeneric,
-                       UndecidableInstances,
-                       RecursiveDo,
-                       RecordWildCards,
-                       RankNTypes,
-                       DuplicateRecordFields,
-                       StandaloneDeriving
+  default-extensions:
+    DataKinds
+    DeriveAnyClass
+    DeriveGeneric
+    DuplicateRecordFields
+    FlexibleContexts
+    FlexibleInstances
+    MultiParamTypeClasses
+    OverloadedLabels
+    OverloadedStrings
+    RankNTypes
+    RecordWildCards
+    RecursiveDo
+    ScopedTypeVariables
+    StandaloneDeriving
+    TemplateHaskell
+    TupleSections
+    TypeFamilies
+    TypeOperators
+    UndecidableInstances
 
   -- Other library packages from which modules are imported.
-  build-depends:       base
-                     , random
-                     , array
-                     , vector-th-unbox
-                     , colour
-                     , Color
-                     , diagrams-lib
-                     , diagrams-cairo
-                     , massiv-io
-                     , massiv
-                     , diagrams-svg
-                     , diagrams-contrib
-                     , parallel
-                     , linear
-                     , vector
-                     , containers
-                     , optparse-generic
-                     , splitmix
-                     , monad-parallel
-
+  build-depends:
+    , array
+    , base
+    , Color
+    , colour
+    , containers
+    , diagrams-cairo
+    , diagrams-contrib
+    , diagrams-lib
+    , diagrams-svg
+    , linear
+    , massiv
+    , massiv-io
+    , monad-parallel
+    , optparse-generic
+    , parallel
+    , random
+    , splitmix
+    , vector
+    , vector-th-unbox
 
   -- Directories containing source files.
-  hs-source-dirs:      src
+  hs-source-dirs:     src
 
   -- Base language which the package is written in.
-  default-language:    Haskell2010
-  ghc-options:
-                -fprof-auto
-                -- -threaded
-                "-with-rtsopts=-p"
-              -- -prof
---               -fexternal-interpreter
+  default-language:   GHC2021
+
+-- ghc-options:
+--               -fprof-auto
+--               "-with-rtsopts=-p"