diff --git a/pyproject.toml b/pyproject.toml
index a7ea225..88aba8a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ Issues = "https://github.com/GermanCodeEngineer/py-pmp-manip/issues/"
 dev = [
     "graphviz~=0.21",
     "pytest~=9.0",
-    "tomlkit~=0.14",
+    "tomlkit~=0.15",
     "coverage~=7.14",
     "pipreqs~=0.5",
 ]