diff --git a/hledger-lib.cabal b/hledger-lib.cabal
--- a/hledger-lib.cabal
+++ b/hledger-lib.cabal
@@ -1,5 +1,5 @@
 name:           hledger-lib
-version: 0.18.1
+version: 0.18.2
 category:       Finance
 synopsis:       Core data types, parsers and utilities for the hledger accounting tool.
 description:
@@ -55,7 +55,7 @@
                   Hledger.Utils
                   Hledger.Utils.UTF8IOCompat
   Build-Depends:
-                  base >= 3 && < 5
+                  base >= 4.3 && < 5
                  ,bytestring
                  ,cmdargs >= 0.9.1   && < 0.10
                  ,containers