diff --git a/requirements.txt b/requirements.txt
index 66201c1..102e348 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ cffi==1.12.3              # via natto-py
 chardet==3.0.4            # via requests
 cycler==0.10.0            # via matplotlib
 idna==2.8                 # via requests
-matplotlib==2.2.3         # via wordcloud
+matplotlib==3.1.1         # via wordcloud
 natto-py==0.9.0
 numpy==1.16.4             # via matplotlib, wordcloud
 oauthlib==3.0.1           # via requests-oauthlib