diff --git a/appveyor.yml b/appveyor.yml
index 59fa0afa974c16f5e786a622d7957d55ad05b857..384606b9554c212209def28e08b6cf77907f2f19 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -44,7 +44,7 @@ install:
   - choco install -y vcredist2015
   - "%CMD_IN_ENV% conda config --set always_yes yes --set changeps1 no"
   - "%CMD_IN_ENV% conda config --add channels inso/channel/sakia"
-  - "%CMD_IN_ENV% conda create -q -n test-environment python=%PYTHON_VERSION% pyqt5 libsodium=1.0.3"
+  - "%CMD_IN_ENV% conda create -q -n test-environment python=%PYTHON_VERSION% pyqt5=5.6 libsodium=1.0.3"
 
 cache:
   - C:\Qt\5.6\5.6