diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+0.9
+
+* Update base version.
+
 0.8
 
 * Add decimal arithmetic
diff --git a/digit.cabal b/digit.cabal
--- a/digit.cabal
+++ b/digit.cabal
@@ -1,5 +1,5 @@
 name:               digit
-version:            0.8
+version:            0.9
 license:            BSD3
 license-file:       LICENCE
 author:             Queensland Functional Programming Lab <oᴉ˙ldɟb@llǝʞsɐɥ>
@@ -28,7 +28,7 @@
                     Haskell2010
 
   build-depends:
-                    base               >= 4.8 && < 4.13
+                    base               >= 4.8 && < 5
                     , lens             >= 4.0 && < 5
                     , parsers          >= 0.12.3 && < 0.13
                     , semigroups       >= 0.12 && < 1.0