diff --git a/requirements.txt b/requirements.txt
index 0341cc29..b343fa97 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ dill==0.3.7
     # via
     #   multiprocess
     #   pathos
-fonttools==4.46.0
+fonttools==4.47.0
     # via matplotlib
 future==0.18.3
     # via uncertainties