diff --git a/appveyor.yml b/appveyor.yml
index 83a7799..d6c6a9e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -15,7 +15,7 @@ branches:
 #---------------------------------#
 
 # Operating system (build VM template)
-os: Visual Studio 2017
+os: Visual Studio 2019
 
 #---------------------------------#
 #       build configuration       #