diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## 0.9.11
+### Added
+- Add `-O2` optimisations to GHC.
+
 ## 0.9.10
 ### Added
 - Increase debugging information where application freezes.
diff --git a/haskoin-node.cabal b/haskoin-node.cabal
--- a/haskoin-node.cabal
+++ b/haskoin-node.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: ed26c1f8581dfc0159d9f218bdcadf4dd80c69ae8298bac37fcb472554abdb3d
+-- hash: d7f0f3506124cc6b88315a025cb4d903ef1fc664732c0f8a981a67315542c5e3
 
 name:           haskoin-node
-version:        0.9.10
+version:        0.9.11
 synopsis:       Haskoin Node P2P library for Bitcoin and Bitcoin Cash
 description:    Bitcoin and Bitcoin Cash peer-to-peer protocol library featuring headers-first synchronisation.
 category:       Bitcoin, Finance, Network
@@ -37,6 +37,7 @@
       Paths_haskoin_node
   hs-source-dirs:
       src
+  ghc-options: -O2
   build-depends:
       base >=4.9 && <5
     , bytestring