diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for srtree
 
+## 0.1.1.0
+
+- Fixed compilation bug
+
 ## 0.1.0.0
 
 - Initial version
diff --git a/srtree.cabal b/srtree.cabal
--- a/srtree.cabal
+++ b/srtree.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           srtree
-version:        0.1.0.0
+version:        0.1.1.0
 synopsis:       A general framework to work with Symbolic Regression expression trees.
 description:    Please see the README on GitHub at <https://github.com/folivetti/srtree#readme>
 category:       Math, Data, Data Structures
@@ -35,9 +35,8 @@
       Paths_srtree
   hs-source-dirs:
       src
-  ghc-options: -O2
   build-depends:
-      base ==4.15.*
+      base ==4.16.*
     , containers ==0.6.*
     , mtl ==2.2.*
     , random ==1.2.*
@@ -53,7 +52,7 @@
       test
   ghc-options: -threaded -rtsopts -with-rtsopts=-N
   build-depends:
-      base ==4.15.*
+      base ==4.16.*
     , containers ==0.6.*
     , mtl ==2.2.*
     , random ==1.2.*