diff --git a/pyproject.toml b/pyproject.toml
index c1ef478..a9fb0e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
     "Topic :: Scientific/Engineering"
 ]
 dependencies = [
-	"tmtccmd ~= 4.1",
+	"tmtccmd ~= 5.0.0a0",
 	"python-dateutil ~= 2.8",
 	# tmtccmd @ git+https://github.com/robamu-org/tmtccmd@<gitRev>#egg=tmtccmd
 ]