diff --git a/sr-extra.cabal b/sr-extra.cabal
--- a/sr-extra.cabal
+++ b/sr-extra.cabal
@@ -1,5 +1,5 @@
 Name:           sr-extra
-Version:        1.85
+Version:        1.85.1
 License:        BSD3
 License-File:   COPYING
 Author:         David Fox
@@ -37,7 +37,7 @@
   default-language: Haskell2010
   GHC-Options: -Wall -Wredundant-constraints
   Build-Depends:
-    base < 5,
+    base >= 4.9 && < 5,
     base64-bytestring,
     bytestring,
     bzlib,