diff --git a/pyproject.toml b/pyproject.toml
index 6aa432bd..a1c1d51c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ Changelog = "https://github.com/aeger/RegiLattice/blob/main/CHANGELOG.md"
 regilattice = "regilattice.cli:main"
 
 [project.optional-dependencies]
-dev = ["pytest>=8,<9", "pytest-cov>=7,<8", "mypy>=1.5,<2", "ruff>=0.4,<1"]
+dev = ["pytest>=8,<10", "pytest-cov>=7,<8", "mypy>=1.5,<2", "ruff>=0.4,<1"]
 
 # ── Tool configuration ──────────────────────────────────────────────────────────