diff --git a/brittany.cabal b/brittany.cabal
index 332ca76..4d43fcc 100644
--- a/brittany.cabal
+++ b/brittany.cabal
@@ -335,8 +335,9 @@ test-suite littests
   ghc-options: {
     -Wall
     -fno-warn-unused-imports
+    -threaded
     -rtsopts
-    -with-rtsopts "-M2G"
+    -with-rtsopts "-M2G -N"
   }
 
 test-suite libinterfacetests
diff --git a/src-literatetests/Main.hs b/src-literatetests/Main.hs
index 8f492d1..1196a56 100644
--- a/src-literatetests/Main.hs
+++ b/src-literatetests/Main.hs
@@ -1,12 +1,13 @@
 {-# LANGUAGE QuasiQuotes #-}
 
-module Main where
+module Main (main) where
 
 
 
 #include "prelude.inc"
 
 import Test.Hspec
+import Test.Hspec.Runner ( hspecWith, defaultConfig, configConcurrentJobs )
 
 import NeatInterpolation
 
@@ -22,6 +23,7 @@ import Language.Haskell.Brittany.Internal.Config.Types
 import Language.Haskell.Brittany.Internal.Config
 
 import Data.Coerce ( coerce )
+import GHC.Conc    ( getNumCapabilities )
 
 import qualified Data.Text.IO as Text.IO
 import           System.FilePath ( (</>) )
@@ -48,7 +50,8 @@ main = do
   let groups = createChunks =<< inputs
   inputCtxFree <- Text.IO.readFile "src-literatetests/30-tests-context-free.blt"
   let groupsCtxFree = createChunks inputCtxFree
-  hspec $ do
+  jobs <- getNumCapabilities
+  hspecWith (defaultConfig { configConcurrentJobs = Just jobs }) $ do
     groups `forM_` \(groupname, tests) -> do
       describe (Text.unpack groupname) $ tests `forM_` \(name, pend, inp) -> do
         (if pend then before_ pending else id)