--- a/lukko.cabal
+++ b/lukko.cabal
@@ -72,7 +72,7 @@ flag ofd-locking
 library
   default-language:   Haskell2010
   hs-source-dirs:     src
-  build-depends:      base >=4.12.0.0 && <4.21
+  build-depends:      base >=4.12.0.0 && <5
   build-tool-depends: hsc2hs:hsc2hs >=0.68.5 && <0.69
 
   -- Main library module
