diff --git a/appveyor.yml b/appveyor.yml
index 698bce611..c7d040555 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -40,9 +40,10 @@ build_script:
     - "%VENV_BUILD_DIR%\\Scripts\\activate.bat"
 
     # Install build dependencies
-    - "pip install wheel"
-    - "pip install numpy"
-    - "pip install cython"
+    - "pip install --upgrade build"
+    - "pip install --upgrade wheel"
+    - "pip install --upgrade numpy"
+    - "pip install --upgrade cython"
 
     # Print Python info
     - "python ci\\info_platform.py"