diff --git a/shake.cabal b/shake.cabal
index 06adfef6..5063f3a4 100644
--- a/shake.cabal
+++ b/shake.cabal
@@ -90,7 +90,7 @@ library
     default-language: Haskell2010
     hs-source-dirs:   src
     build-depends:
-        base >= 4.9,
+        base >= 4.9 && < 5,
         binary,
         bytestring,
         deepseq >= 1.1,