diff --git a/crf-chain2-tiers.cabal b/crf-chain2-tiers.cabal
--- a/crf-chain2-tiers.cabal
+++ b/crf-chain2-tiers.cabal
@@ -1,5 +1,5 @@
 name:               crf-chain2-tiers
-version:            0.2.2
+version:            0.2.3
 synopsis:           Second-order, tiered, constrained, linear conditional random fields
 description:
     The library provides implementation of the second-order, linear
@@ -30,7 +30,7 @@
       , vector-binary
       , monad-codec             >= 0.2          && < 0.3
       , data-lens               >= 2.10.4       && < 2.11
-      , comonad                 >= 4.0          && < 4.1
+      , comonad                 >= 4.0          && < 4.3
       , logfloat                >= 0.12.1       && < 0.13
       , parallel
       , sgd                     >= 0.3.2        && < 0.4