--- a/splitmix.cabal
+++ b/splitmix.cabal
@@ -77,7 +77,7 @@ library
   -- ghc-options: -fplugin=DumpCore -fplugin-opt DumpCore:core-html
 
   build-depends:
-      base     >=4.3     && <4.17
+      base     >=4.3     && <5
     , deepseq  >=1.3.0.0 && <1.5
 
   if flag(optimised-mixer)
