diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7c1793b..fe004cf 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,4 +6,4 @@ coveralls~=3.3.1
 rope~=1.7.0
 Sphinx~=7.2.6
 hfilesize~=0.1.0
-humanize~=4.4
+humanize~=4.9