diff --git a/vis/requirements.txt b/vis/requirements.txt
index 23bfa8e2..8d22be19 100644
--- a/vis/requirements.txt
+++ b/vis/requirements.txt
@@ -1,6 +1,6 @@
 # These packages are required for vis.
 # Certain functionality will be missing; see optional_requirements.txt.
-music21>=1.9.3,<2
+music21>=1.9.3,<2.1
 pandas>=0.14.1,<0.16
 mock>=1.0.1
 coverage