diff --git a/cabal.project.local b/cabal.project.local
--- a/cabal.project.local
+++ b/cabal.project.local
@@ -1,5 +1,8 @@
 -- constraints: dhall-lex +development
 documentation: True
 
+allow-newer:
+  Cabal
+
 program-options
   alex-options: -g
diff --git a/dhall-lex.cabal b/dhall-lex.cabal
--- a/dhall-lex.cabal
+++ b/dhall-lex.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.18
 name: dhall-lex
-version: 0.1.0.0
+version: 0.1.0.1
 license: BSD3
 license-file: LICENSE
 copyright: Copyright: (c) 2018 Vanessa McHale
@@ -37,6 +37,7 @@
         Language.Dhall.Lexer.Types
     default-language: Haskell2010
     ghc-options: -Wall
+    build-tools: alex
     build-depends:
         base >=4.8 && <5,
         array -any,