diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -14,3 +14,6 @@
 * Added parallelism effects.
 * Added an effect for the `co-log` logging.
 * Generalize the 'Provider' effect.
+
+## 0.3.0.1 -- 2024-11-03
+* Fixed build error for GHC 9.4.1.
diff --git a/data-effects.cabal b/data-effects.cabal
--- a/data-effects.cabal
+++ b/data-effects.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               data-effects
-version:            0.3.0.0
+version:            0.3.0.1
 
 -- A short (one-line) description of the package.
 synopsis: A basic framework for effect systems based on effects represented by GADTs.
@@ -39,7 +39,7 @@
 source-repository head
     type: git
     location: https://github.com/sayo-hs/data-effects
-    tag: v0.3.0
+    tag: v0.3.0.1
     subdir: data-effects
 
 library
diff --git a/src/Data/Effect/Concurrent/Parallel.hs b/src/Data/Effect/Concurrent/Parallel.hs
--- a/src/Data/Effect/Concurrent/Parallel.hs
+++ b/src/Data/Effect/Concurrent/Parallel.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE CPP #-}
 
 -- SPDX-License-Identifier: MPL-2.0
 
@@ -11,6 +12,9 @@
 -}
 module Data.Effect.Concurrent.Parallel where
 
+#if ( __GLASGOW_HASKELL__ < 906 )
+import Control.Applicative (liftA2)
+#endif
 import Control.Applicative (Alternative (empty, (<|>)))
 import Data.Tuple (swap)