diff --git a/harpie-numhask.cabal b/harpie-numhask.cabal
--- a/harpie-numhask.cabal
+++ b/harpie-numhask.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: harpie-numhask
-version: 0.1.0.0
+version: 0.1.0.1
 license: BSD-3-Clause
 license-file: LICENSE
 copyright: Tony Day (c) 2024
@@ -64,6 +64,7 @@
         , base             >=4.14 && <5
         , doctest-parallel >=0.3 && <0.4
         , harpie-numhask
+        , prettyprinter    >=1.7 && <1.8
     default-extensions: RebindableSyntax
     ghc-options: -threaded
     type: exitcode-stdio-1.0