diff --git a/cabal.project b/cabal.project
index 5e2e5da..5b02f50 100644
--- a/cabal.project
+++ b/cabal.project
@@ -11,7 +11,8 @@ source-repository-package
 
 constraints: http-io-streams -brotli,
              any.Cabal ==3.6.2.0,
-             any.aeson >= 2.0.1.0
+             any.aeson >= 2.0.1.0,
+             any.alex <=3.2.6
 
 package libarchive
   flags: -system-libarchive