diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Revision history for futhark-server
 
+## 1.2.2.1 -- 2023-03-21
+
+* Support GHC 9.6.
+
 ## 1.2.2.0 -- 2023-03-10
 
 * Added `cmdTuningParams`.
diff --git a/futhark-server.cabal b/futhark-server.cabal
--- a/futhark-server.cabal
+++ b/futhark-server.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               futhark-server
-version:            1.2.2.0
+version:            1.2.2.1
 synopsis: Client implementation of the Futhark server protocol.
 
 description: Provides an easy way to interact with a running Futhark
diff --git a/src/Futhark/Server.hs b/src/Futhark/Server.hs
--- a/src/Futhark/Server.hs
+++ b/src/Futhark/Server.hs
@@ -73,6 +73,7 @@
 import Control.Exception
 import Control.Monad
 import Control.Monad.Except
+import Control.Monad.IO.Class (MonadIO, liftIO)
 import Data.Text (Text)
 import qualified Data.Text as T
 import qualified Data.Text.IO as T