diff --git a/Language/SSVM/Types.hs b/Language/SSVM/Types.hs
--- a/Language/SSVM/Types.hs
+++ b/Language/SSVM/Types.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE DeriveDataTypeable, TypeSynonymInstances #-}
+{-# LANGUAGE DeriveDataTypeable, TypeSynonymInstances, FlexibleInstances #-}
 module Language.SSVM.Types where
 
 import Control.Monad.State
diff --git a/simple-stacked-vm.cabal b/simple-stacked-vm.cabal
--- a/simple-stacked-vm.cabal
+++ b/simple-stacked-vm.cabal
@@ -1,5 +1,5 @@
 Name:           simple-stacked-vm
-Version:        0.1
+Version:        0.1.1
 Cabal-Version:  >= 1.6
 License:        BSD3
 License-File:   LICENSE