diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,10 @@
 
 * Bug correction in pairs.
 
-# 1.3.4.0 -- 2022-08-30
+# 1.4.0.0 -- 2022-08-30
 
-* Bug correction in maybeSecond.
+* Bug correction in maybeSecond.
+
+# 1.4.0.1 -- 2023-09-23
+
+* Base update to 4.18.0.0
diff --git a/WeakSets.cabal b/WeakSets.cabal
--- a/WeakSets.cabal
+++ b/WeakSets.cabal
@@ -14,7 +14,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.4.0.0
+version:             1.4.0.1
 
 -- A short (one-line) description of the package.
 synopsis:
@@ -68,7 +68,7 @@
     -- other-extensions:
 
     -- Other library packages from which modules are imported.
-    build-depends:    base ^>=4.15.0.0
+    build-depends:    base ^>=4.18.0.0
 
     -- Directories containing source files.
     hs-source-dirs:   src
@@ -90,6 +90,6 @@
     main-is:          AllTests.hs
 
     -- Test dependencies.
-    build-depends:    base ^>=4.15.0.0, WeakSets
+    build-depends:    base ^>=4.18.0.0, WeakSets
     
     other-modules:    TestWeakSet, TestPureSet, TestWeakMap