diff --git a/constraints-extras.cabal b/constraints-extras.cabal
--- a/constraints-extras.cabal
+++ b/constraints-extras.cabal
@@ -1,5 +1,5 @@
 name: constraints-extras
-version: 0.2.3.2
+version: 0.2.3.3
 synopsis: Utility package for constraints
 description: Convenience functions and TH for working with constraints. See <https://github.com/obsidiansystems/constraints-extras/blob/develop/README.md README.md> for example usage.
 category: Constraints
@@ -9,7 +9,7 @@
 maintainer: maintainer@obsidian.systems
 copyright: Obsidian Systems LLC
 build-type: Simple
-cabal-version: >=1.10
+cabal-version: >=2.0
 extra-source-files: README.md
 
 library
@@ -37,10 +37,10 @@
                , aeson
                , constraints >= 0.9 && < 0.11
                , constraints-extras
-               , markdown-unlit
   main-is: README.lhs
   ghc-options: -pgmL markdown-unlit -Wall
   default-language: Haskell2010
+  build-tool-depends: markdown-unlit:markdown-unlit
 
 source-repository head
   type:     git