diff --git a/salve.cabal b/salve.cabal
--- a/salve.cabal
+++ b/salve.cabal
@@ -1,6 +1,6 @@
 cabal-version: 2.2
 name: salve
-version: 2.0.0.5
+version: 2.0.0.6
 synopsis: Semantic version numbers and constraints.
 description:
   Salve provides semantic version (SemVer) numbers and constraints (ranges).
@@ -24,7 +24,7 @@
   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