diff --git a/package.mask/all b/package.mask/all
index 8854560..249cf7e 100644
--- a/package.mask/all
+++ b/package.mask/all
@@ -1,6 +1,7 @@
 >=dev-db/postgresql-11
 >=dev-lang/php-7.3
 >=dev-lang/python-3.8
+>=dev-python/numpy-1.19
 >=dev-scheme/guile-2.2
 =dev-util/kbuild-0.1.9998.3407
 =mail-filter/spamassassin-3.4.4-r4