diff --git a/cabal.project b/cabal.project
new file mode 100644
index 0000000..051d727
--- /dev/null
+++ b/cabal.project
@@ -0,0 +1,7 @@
+packages: .
+
+allow-newer: multistate:base,
+             data-tree-print:base,
+             czipwith:base,
+             czipwith:template-haskell,
+             butcher:base