diff --git a/lattices.cabal b/lattices.cabal
--- a/lattices.cabal
+++ b/lattices.cabal
@@ -1,5 +1,5 @@
 Name:               lattices
-Version:            1.2.1
+Version:            1.2.1.1
 Cabal-Version:      >= 1.2
 Category:           Math
 Synopsis:           Fine-grained library for constructing and manipulating lattices
@@ -16,6 +16,6 @@
                          Algebra.Lattice.Levitated,
                          Algebra.Lattice.Lifted,
                          Algebra.PartialOrd
-                         
+
         Build-Depends:   base >= 3 && < 5,
-                         containers >= 0.3 && < 0.5
+                         containers >= 0.3 && < 0.6