diff --git a/pyproject.toml b/pyproject.toml
index 0e6bc12..2bb35ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ Documentation =  "https://colormap.readthedocs.io"
 [tool.poetry.dependencies]
 python = "^3.8"
 matplotlib = "^3"
-numpy = "^1.24"
+numpy = "^1.20"