diff --git a/pyproject.toml b/pyproject.toml
index 1459133..9355614 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
 ]
 dependencies = [
-    "numpy>=1.21.6",
+    "numpy>=1.15.0",
     "pyswip>=0.2.9",
     "torch>=1.11.0",
     "torchvision>=0.12.0",
diff --git a/requirements.txt b/requirements.txt
index ece1d56..6c27923 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy>=1.21.6,
+numpy>=1.15.0,
 pyswip>=0.2.9,
 torch>=1.11.0,
 torchvision>=0.12.0,