diff --git a/requirements.txt b/requirements.txt
index 0d131990..5a94254c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,4 +12,4 @@ coverage==4.4.1
 flake8==3.3.0
 newick==0.7
 clldutils==1.9.5
-attrs==16.3.0
+attrs==17.1.0