diff --git a/appveyor.yml b/appveyor.yml
index cd8d102..6812d59 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,7 +19,7 @@ build_script:
   - cd build
   - git clone https://github.com/toml-lang/toml.git
   - file --mime-encoding toml/tests/hard_example_unicode.toml
-  - cmake -G"%generator%" -DBOOST_ROOT=C:/Libraries/boost_1_63_0 ..
+  - cmake -G"%generator%" -DBOOST_ROOT=C:/Libraries/boost_1_69_0 ..
   - cmake --build . --config "%configuration%"
 
 test_script: