diff --git a/requirements.txt b/requirements.txt
index 1c8fe22f..1c0570f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 luigi==3.0.2
-honeybee-radiance==1.28.5
+honeybee-radiance==1.28.6
 click==7.1.2