diff --git a/PyF.cabal b/PyF.cabal
--- a/PyF.cabal
+++ b/PyF.cabal
@@ -1,5 +1,5 @@
 name:                PyF
-version:             0.6.1.0
+version:             0.6.1.1
 synopsis: Quasiquotations for a python like interpolated string formater
 description: Quasiquotations for a python like interpolated string formater.
 license:             BSD3
@@ -40,6 +40,7 @@
   hs-source-dirs:      test
   main-is:             Spec.hs
   other-modules: SpecUtils SpecCustomDelimiters
+  build-tools:  python3
   build-depends:       base, PyF, hspec, text, template-haskell, formatting, process
   ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
   default-language:    Haskell2010