diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@
 
 ## Unreleased
 
+## 0.0.1.1 - 0.1.0 - 2024-01-11
+
+### Removed
+
+- -O2 and -fllvm options
+
 ## 0.0.1.0 - 0.1.0 - 2024-01-03
 
 ### Added
diff --git a/WringTwistree.cabal b/WringTwistree.cabal
--- a/WringTwistree.cabal
+++ b/WringTwistree.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           WringTwistree
-version:        0.0.1.0
+version:        0.0.1.1
 synopsis:       Whole-message cipher and tree hash
 description:    Please see the README on GitHub at <https://github.com/phma/wring-twistree#readme>
 category:       Cryptography
@@ -39,7 +39,7 @@
       Cryptography.WringTwistree.Sboxes
   hs-source-dirs:
       src
-  ghc-options: -O2 -fllvm -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
+  ghc-options: -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
   build-depends:
       arithmoi
     , array
@@ -61,7 +61,7 @@
       Paths_WringTwistree
   hs-source-dirs:
       app
-  ghc-options: -O2 -fllvm -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  ghc-options: -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       WringTwistree
     , arithmoi
@@ -85,7 +85,7 @@
       Paths_WringTwistree
   hs-source-dirs:
       test
-  ghc-options: -O2 -fllvm -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  ghc-options: -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       WringTwistree
     , array