--- a/singleton-bool.cabal
+++ b/singleton-bool.cabal
@@ -36,7 +36,7 @@ library
   hs-source-dirs:   src
   ghc-options:      -Wall
   build-depends:
-      base     >=4.7   && <4.16
+      base     >=4.7   && <5
     , boring   >=0.2   && <0.3
     , dec      >=0.0.3 && <0.1
     , deepseq  >=1.3   && <1.5
