diff --git a/haddock-library/haddock-library.cabal b/haddock-library/haddock-library.cabal
index 3d9b75576c6d5d70819837c3ecdbf32981db4b78..c2ea73b0e4d74c936707efbeffc71844678e291b 100644
--- a/haddock-library/haddock-library.cabal
+++ b/haddock-library/haddock-library.cabal
@@ -21,7 +21,7 @@ library
   default-language:     Haskell2010
 
   build-depends:
-      base >= 4.3 && < 4.9
+      base >= 4.5 && < 4.9
     , bytestring
     , transformers
     , deepseq