diff --git a/xsd-parser.cabal b/xsd-parser.cabal
index a69f0fc..7f1f00b 100644
--- a/xsd-parser.cabal
+++ b/xsd-parser.cabal
@@ -24,7 +24,7 @@ library
                      , Xsd.Parser
 
   -- Other library packages from which modules are imported.
-  build-depends:       base ^>=4.12.0.0
+  build-depends:       base >=4.12 && < 5
                      , bytestring
                      , containers
                      , lens >= 4.13