diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 963fbdf..0f7f130 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,14 +20,10 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
+          - macos-12
         ghc:
-          - '9.4'
-          - '9.6'
-          - '9.8'
           - '9.10'
-        include:
-          - os: macos-12
-            ghc: system
+
     steps:
       - uses: actions/checkout@v3
       - uses: hspec/setup-haskell@v1
@@ -54,9 +50,12 @@ jobs:
         run: cabal build all
 
       - shell: bash
-        run: $(cabal list-bin spec) --times --print-slow
-        env:
-          HSPEC_OPTIONS: --color
+        run: |
+          for GHC in 9.4 9.6 9.8 9.10
+          do
+            ghcup install ghc $GHC --no-set
+            SENSEI_GHC=ghc-$GHC $(cabal list-bin spec)
+          done
 
   success:
     needs: build
diff --git a/cabal.project b/cabal.project
index a4eadbd..63f8c7f 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,3 +1,5 @@
+with-compiler: ghc-9.10.1
+
 packages:
   sensei.cabal
 
diff --git a/package.yaml b/package.yaml
index 3a31ba5..6122fd3 100644
--- a/package.yaml
+++ b/package.yaml
@@ -41,7 +41,7 @@ dependencies:
   - async
   - containers
   - transformers
-  - mtl
+  - mtl >= 2.3.1
   - aeson
   - yaml
   - casing
diff --git a/sensei.cabal b/sensei.cabal
index c3b1183..f7f313a 100644
--- a/sensei.cabal
+++ b/sensei.cabal
@@ -64,7 +64,7 @@ executable seito
     , fsnotify ==0.4.*
     , http-client >=0.5.0
     , http-types
-    , mtl
+    , mtl >=2.3.1
     , network
     , pretty
     , process
@@ -124,7 +124,7 @@ executable sensei
     , fsnotify ==0.4.*
     , http-client >=0.5.0
     , http-types
-    , mtl
+    , mtl >=2.3.1
     , network
     , pretty
     , process
@@ -184,7 +184,7 @@ executable sensei-web
     , fsnotify ==0.4.*
     , http-client >=0.5.0
     , http-types
-    , mtl
+    , mtl >=2.3.1
     , network
     , pretty
     , process
@@ -268,7 +268,7 @@ test-suite spec
     , http-client >=0.5.0
     , http-types
     , mockery
-    , mtl
+    , mtl >=2.3.1
     , network
     , pretty
     , process
diff --git a/src/Trigger.hs b/src/Trigger.hs
index b75a42a..c352e13 100644
--- a/src/Trigger.hs
+++ b/src/Trigger.hs
@@ -14,12 +14,8 @@ module Trigger (
 
 import           Imports
 
-#if MIN_VERSION_mtl(2,3,1)
 import           Control.Monad.Trans.Writer.CPS (runWriterT)
 import           Control.Monad.Writer.CPS hiding (pass)
-#else
-import           Control.Monad.Writer.Strict hiding (pass)
-#endif
 
 import           Control.Monad.Except
 
diff --git a/test/TriggerSpec.hs b/test/TriggerSpec.hs
index 16b1495..cea6cc1 100644
--- a/test/TriggerSpec.hs
+++ b/test/TriggerSpec.hs
@@ -3,6 +3,8 @@ module TriggerSpec (spec) where
 
 import           Helper
 
+import qualified Data.Text as Text
+
 import qualified Session
 import           Session (Session)
 import           Language.Haskell.GhciWrapper (Config(..))
@@ -11,7 +13,7 @@ import           Trigger hiding (trigger, triggerAll)
 import qualified Trigger
 
 normalize :: String -> [String]
-normalize = normalizeTiming . lines
+normalize = normalizeTiming . lines . forGhc9dot4
   where
     normalizeTiming :: [String] -> [String]
     normalizeTiming = normalizeLine "Finished in "
@@ -23,6 +25,11 @@ normalize = normalizeTiming . lines
           | message `isPrefixOf` line = message ++ "..."
           | otherwise = line
 
+    forGhc9dot4 :: String -> String
+    forGhc9dot4 = Text.unpack
+      . Text.replace " error: Variable not in scope: " " error: [GHC-88464] Variable not in scope: "
+      . Text.pack
+
 withSession :: FilePath -> [String] -> (Session -> IO a) -> IO a
 withSession specPath args = do
   Session.withSession ghciConfig {configWorkingDirectory = Just dir} $
@@ -147,19 +154,14 @@ spec = do
       it "stops after reloading" $ \ name -> do
         withSession name [] $ \ session -> do
           writeFile name (passingSpec ++ "foo = bar")
-          (trigger session >> trigger session) `shouldReturn` (Failure, [
+
+          let
+            fitterNotNull :: [String] -> [String]
+            fitterNotNull = filter (not . null)
+
+          (fmap fitterNotNull <$> (trigger session >> trigger session)) `shouldReturn` (Failure, [
               "[1 of 1] Compiling Spec"
-#if __GLASGOW_HASKELL__ < 910
-            , ""
-#endif
-#if __GLASGOW_HASKELL__ >= 906
             , "Spec.hs:9:7: error: [GHC-88464] Variable not in scope: bar"
-#else
-            , "Spec.hs:9:7: error: Variable not in scope: bar"
-#endif
-#if __GLASGOW_HASKELL__ >= 910
-            , ""
-#endif
             , withColor Red "RELOADING FAILED"
             ])