diff --git a/pyproject.toml b/pyproject.toml
index aa6afbd..bb4f9ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ classifiers = [
 ]
 license = { file = "LICENSE" }
 dependencies = [
-    "gdstk",
+    "gdstk>=0.9.55",
     "matplotlib",
     "numpy",
     "opencv-python-headless",