Even better dependencies

textual.cabal

@@ -35,6 +35,6 @@ source-repository this
 library
   exposed-modules:     Data.Textual
   other-extensions:    TypeSynonymInstances, FlexibleInstances
-  build-depends:       base >=4.7, bytestring >=0.10, utf8-string >=1, text >=1.2
+  build-depends:       base >=4.7 && <4.8, bytestring >=0.10, utf8-string >=1, text >=1.2
   hs-source-dirs:      src
   default-language:    Haskell2010