diff --git a/appveyor.yml b/appveyor.yml
index ef2072cee..632d1ba65 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -22,7 +22,7 @@ install:
   - cmd: call %CONDA_INSTALL_LOCN%\Scripts\activate.bat
   - cmd: conda config --set always_yes yes --set changeps1 no --set show_channel_urls true
   - cmd: conda update conda
-  - cmd: conda install hdf5 curl hdf4
+  - cmd: conda install hdf5=1.8.18 curl hdf4
 
 configuration: Release