diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,8 @@
 # Changelog
 
+- 0.1.4 (2025-12-28)
+  * Adds an 'llvm' build flag and tests with GHC 9.10.3.
+
 - 0.1.3 (2025-02-06)
   * Makes a minor optimization to register concatenation (swapping five
     builders for 3) and also refines builder realization by input size.
diff --git a/ppad-ripemd160.cabal b/ppad-ripemd160.cabal
--- a/ppad-ripemd160.cabal
+++ b/ppad-ripemd160.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               ppad-ripemd160
-version:            0.1.3
+version:            0.1.4
 synopsis:           The RIPEMD-160 hashing algorithm.
 license:            MIT
 license-file:       LICENSE
@@ -8,12 +8,17 @@
 maintainer:         jared@ppad.tech
 category:           Cryptography
 build-type:         Simple
-tested-with:        GHC == 9.8.1
+tested-with:        GHC == 9.10.3
 extra-doc-files:    CHANGELOG
 description:
   A pure implementation of RIPEMD-160 and HMAC-RIPEMD160 on strict and
   lazy ByteStrings.
 
+flag llvm
+  description: Use GHC's LLVM backend.
+  default:     False
+  manual:      True
+
 source-repository head
   type:     git
   location: git.ppad.tech/ripemd160.git
@@ -23,6 +28,8 @@
   hs-source-dirs:   lib
   ghc-options:
       -Wall
+  if flag(llvm)
+    ghc-options: -fllvm -O2
   exposed-modules:
       Crypto.Hash.RIPEMD160
   build-depends:
@@ -41,8 +48,8 @@
   build-depends:
       aeson
     , base
-    , base16-bytestring
     , bytestring
+    , ppad-base16
     , ppad-ripemd160
     , tasty
     , tasty-hunit
diff --git a/test/Main.hs b/test/Main.hs
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -121,8 +121,13 @@
   let out = B16.encode (RIPEMD160.hmac_lazy key put)
   assertEqual mempty pec out
 
+decodeLenient :: BS.ByteString -> BS.ByteString
+decodeLenient bs = case B16.decode bs of
+  Nothing -> error "bang"
+  Just b -> b
+
 hmv1_key :: BS.ByteString
-hmv1_key = B16.decodeLenient "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"
+hmv1_key = decodeLenient "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"
 
 hmv1_put :: BS.ByteString
 hmv1_put = "Hi There"
@@ -140,25 +145,25 @@
 hmv2_pec = "dda6c0213a485a9e24f4742064a7f033b43c4069"
 
 hmv3_key :: BS.ByteString
-hmv3_key = B16.decodeLenient "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+hmv3_key = decodeLenient "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
 
 hmv3_put :: BS.ByteString
-hmv3_put = B16.decodeLenient "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
+hmv3_put = decodeLenient "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
 
 hmv3_pec :: BS.ByteString
 hmv3_pec = "b0b105360de759960ab4f35298e116e295d8e7c1"
 
 hmv4_key :: BS.ByteString
-hmv4_key = B16.decodeLenient "0102030405060708090a0b0c0d0e0f10111213141516171819"
+hmv4_key = decodeLenient "0102030405060708090a0b0c0d0e0f10111213141516171819"
 
 hmv4_put :: BS.ByteString
-hmv4_put = B16.decodeLenient "cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd"
+hmv4_put = decodeLenient "cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd"
 
 hmv4_pec :: BS.ByteString
 hmv4_pec = "d5ca862f4d21d5e610e18b4cf1beb97a4365ecf4"
 
 hmv5_key :: BS.ByteString
-hmv5_key = B16.decodeLenient "0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c"
+hmv5_key = decodeLenient "0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c"
 
 hmv5_put :: BS.ByteString
 hmv5_put = "Test With Truncation"
@@ -167,7 +172,7 @@
 hmv5_pec = "7619693978f91d90539ae786500ff3d8e0518e39"
 
 hmv6_key :: BS.ByteString
-hmv6_key = B16.decodeLenient "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+hmv6_key = decodeLenient "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
 
 hmv6_put :: BS.ByteString
 hmv6_put = "Test Using Larger Than Block-Size Key - Hash Key First"