Index: b/integer-roots.cabal
===================================================================
--- a/integer-roots.cabal
+++ b/integer-roots.cabal
@@ -27,7 +27,7 @@ library
   if impl(ghc < 9.0)
     build-depends: integer-gmp <1.2
   else
-    build-depends: ghc-bignum < 1.3
+    build-depends: ghc-bignum < 1.4
   exposed-modules:
     Math.NumberTheory.Roots
   other-modules:
