diff --git a/README.md b/README.md
index c50ad42..b5a41c7 100644
--- a/README.md
+++ b/README.md
@@ -89,7 +89,7 @@ sudo: require
 dist: trusty
 
 before_install:
-    - sudo add-apt-repository ppa:beineri/opt-qt59-trusty -y
+    - sudo add-apt-repository ppa:beineri/opt-qt591-trusty -y
     - sudo apt-get update -qq
 
 install: