diff --git a/requirements.txt b/requirements.txt
index 61a594320..85fbc96ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-numpy>=1.13
-scipy>=1.0
+numpy>=1.23  # matplotlib 3.9 requires it
+scipy>=1.8  # first to allow numpy 1.23; bootstrap needs 1.7
 matplotlib>=3.9.0  # Released May 15th 2024
 netCDF4>=1.6.4
 requests