diff --git a/pyproject.toml b/pyproject.toml
index 05e909a1..5eb59d84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,8 +54,8 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "^3.7"
 attrs = ">=19.0"
-numpy = ">=1.9"
-scipy = ">=1.0"
+numpy = "^1.20"
+scipy = "^1"
 
 [tool.poetry.dev-dependencies]
 black = ">=22.1"