diff --git a/cabal.project.dist b/cabal.project.dist
index 73031e43..3bdf3e9a 100644
--- a/cabal.project.dist
+++ b/cabal.project.dist
@@ -42,3 +42,6 @@ packages: base/
           deps/bv-sized/
           deps/bv-sized-float/
           deps/softfloat-hs/
+
+constraints: IntervalMap >= 0.6.2.1
+allow-newer: IntervalMap
\ No newline at end of file