diff --git a/cabal.project b/cabal.project
index afa1854..fe8af4a 100644
--- a/cabal.project
+++ b/cabal.project
@@ -6,6 +6,10 @@ optimization: 2
 
 tests: True
 
+semaphore: True
+
+multi-repl: True
+
 allow-newer: all
 
 test-show-details: direct