diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c7102f..a882ce2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -93,8 +93,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y build-essential curl libffi-dev libffi8ubuntu1 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5
           curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
-          ghcup install -u https://downloads.haskell.org/ghc/9.6.1/ghc-9.6.1-x86_64-deb9-linux.tar.xz ghc-head
-          ghcup set ghc ghc-head
+          ghcup config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.8.yaml
+          ghcup install ghc 9.10.0.20240328
+          ghcup set ghc 9.10.0.20240328
           echo "cabal-store=$HOME/.cabal/store" >> $GITHUB_OUTPUT
 
       - name: Setup CI
diff --git a/cabal.project b/cabal.project
index f7bec5f..202b7f2 100644
--- a/cabal.project
+++ b/cabal.project
@@ -3,7 +3,10 @@ packages:
 
 write-ghc-environment-files: always
 
+source-repository-package
+  type: git
+  location: https://github.com/haskell-unordered-containers/unordered-containers.git
+  tag: d52a0fd10bfa701cbbc9d7ac06bd7eb7664b3972
 
 allow-newer:
-    *:base
-  , *:ghc-bignum
+  unordered-containers:template-haskell
diff --git a/doctest-parallel.cabal b/doctest-parallel.cabal
index a25ec78..9f387ff 100644
--- a/doctest-parallel.cabal
+++ b/doctest-parallel.cabal
@@ -26,6 +26,7 @@ tested-with:
   , GHC == 9.4.7
   , GHC == 9.6.3
   , GHC == 9.8.1
+  , GHC == 9.10.1
 
 extra-source-files:
     example/example.cabal
@@ -102,7 +103,7 @@ library
     , directory
     , exceptions
     , filepath
-    , ghc >=8.2 && <9.9
+    , ghc >=8.2 && <9.11
     , ghc-paths >=0.1.0.9
     , process
     , random >= 1.2
diff --git a/src/Test/DocTest/Internal/Extract.hs b/src/Test/DocTest/Internal/Extract.hs
index d0cd8c9..a8e422d 100644
--- a/src/Test/DocTest/Internal/Extract.hs
+++ b/src/Test/DocTest/Internal/Extract.hs
@@ -329,8 +329,10 @@ extractLit loc = \case
 #else
 #if __GLASGOW_HASKELL__ < 904
   HsPar _ (L l e) -> extractLit (locA l) e
-#else
+#elif __GLASGOW_HASKELL__ < 909
   HsPar _ _ (L l e) _ -> extractLit (locA l) e
+#else
+  HsPar _ (L l e) -> extractLit (locA l) e
 #endif
 #if __GLASGOW_HASKELL__ < 807
   ExprWithTySig _ (L l e) -> extractLit l e
diff --git a/src/Test/DocTest/Internal/Interpreter.hs b/src/Test/DocTest/Internal/Interpreter.hs
index d16acfe..8e4cd3c 100644
--- a/src/Test/DocTest/Internal/Interpreter.hs
+++ b/src/Test/DocTest/Internal/Interpreter.hs
@@ -18,6 +18,7 @@ import System.Directory (getPermissions, executable)
 import Control.Monad
 import Control.Exception hiding (handle)
 import Data.Char
+import Data.List (unsnoc)
 import GHC.Paths (ghc)
 
 import Test.DocTest.Internal.GhciWrapper
@@ -76,13 +77,13 @@ safeEvalIt repl = either (return . Left) (fmap Right . evalIt repl) . filterExpr
 
 filterExpression :: String -> Either String String
 filterExpression e =
-  case lines e of
+  case map strip (lines e) of
     [] -> Right e
-    l  -> if firstLine == ":{" && lastLine /= ":}" then fail_ else Right e
-      where
-        firstLine = strip $ head l
-        lastLine  = strip $ last l
-        fail_ = Left "unterminated multiline command"
+    (firstLine:ls) ->
+      let lastLine = maybe firstLine snd (unsnoc ls) in
+      if firstLine == ":{" && lastLine /= ":}" then fail_ else Right e
   where
+    fail_ = Left "unterminated multiline command"
+
     strip :: String -> String
     strip = dropWhile isSpace . reverse . dropWhile isSpace . reverse
diff --git a/src/Test/DocTest/Internal/Runner/Example.hs b/src/Test/DocTest/Internal/Runner/Example.hs
index 5c8b1a8..0b17c38 100644
--- a/src/Test/DocTest/Internal/Runner/Example.hs
+++ b/src/Test/DocTest/Internal/Runner/Example.hs
@@ -27,7 +27,7 @@ mkResult expected_ actual_ =
     -- use show to escape special characters in output lines if any output line
     -- contains any unsafe character
     escapeOutput
-      | any (not . isSafe) $ concat (expectedAsString ++ actual_) = init . tail . show . stripEnd
+      | any (not . isSafe) $ concat (expectedAsString ++ actual_) = init . drop 1 . show . stripEnd
       | otherwise = id
 
     actual :: [String]