diff --git a/requirements.txt b/requirements.txt
index 2925fa9..3c853ad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -105,7 +105,7 @@ nameparser==0.5.7
 netCDF4==1.5.1.2
 nose==1.3.7
 nose-timer==0.7.6
-numpy==1.24.1
+numpy==1.16.6
 oauthlib==3.1.0
 OWSLib==0.10.3
 packaging==21.3