diff --git a/test_requirements.txt b/test_requirements.txt
index 4b7a879..4519f2a 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,4 +1,4 @@
 pytest
 pytest-datadir
 sortedcontainers
-libcasm-mapping>=2.2.0
+libcasm-mapping>=2.4.1