diff --git a/saturn.cabal b/saturn.cabal
--- a/saturn.cabal
+++ b/saturn.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: saturn
-version: 1.0.0.5
+version: 1.0.0.6
 synopsis: Handle POSIX cron schedules.
 description: Saturn handles POSIX cron schedules.
 build-type: Simple
@@ -22,7 +22,7 @@
   manual: True
 
 common library
-  build-depends: base ^>=4.18.0.0 || ^>=4.19.0.0 || ^>=4.20.0.0
+  build-depends: base ^>=4.19.0.0 || ^>=4.20.0.0 || ^>=4.21.0.0
   default-language: Haskell2010
   ghc-options:
     -Weverything