diff --git a/.gitignore b/.gitignore
index f05722f..8cd9ca0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -408,4 +408,5 @@ time_series_anomaly_detector.egg-info/
 .idea/
 *.so
 *.pyd
-.script\Dockerfile
\ No newline at end of file
+.script\Dockerfile
+src/anomaly_detector/univariate/_anomaly_kernel_cython.c
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index ce5ba3c..910b8e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ classifiers = [
 ]
 
 dependencies = [
-    "numpy>=1.23.5",
+    "numpy<2, >=1.23.5",
     "pandas>=1.3.5",
     "seasonal>=0.3.1",
     "scipy>=1.9.3",