diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 `unicode-collation` uses [PVP Versioning](https://pvp.haskell.org).
 
+## 0.1.3.4
+
+  + Allow base 4.18.
+
 ## 0.1.3.3
 
   + Allow base 4.17.  Closes #12.
diff --git a/unicode-collation.cabal b/unicode-collation.cabal
--- a/unicode-collation.cabal
+++ b/unicode-collation.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                unicode-collation
-version:             0.1.3.3
+version:             0.1.3.4
 synopsis:            Haskell implementation of the Unicode Collation Algorithm
 description:         This library provides a pure Haskell implementation of
                      the Unicode Collation Algorithm described at
@@ -48,7 +48,7 @@
   Default:             False
 
 common common-options
-  build-depends:       base >= 4.11 && < 4.18
+  build-depends:       base >= 4.11 && < 4.19
 
   ghc-options:         -Wall
                        -Wcompat