diff --git a/appveyor.yml b/appveyor.yml
index bd03d877c402..83d30c6a9559 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -82,9 +82,9 @@ install:
   # compiled extensions and are not provided as pre-built wheel packages,
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
-  - "%CMD_IN_ENV% pip install wheel nose nose-exclude cryptography grpcio"
-  # Install sometimes-problemaatic gRPC-related dependencies
-  - "%CMD_IN_ENV% pip install grpcio gax-google-pubsub-v1 gax-google-logging-v2"
+  - "%CMD_IN_ENV% pip install wheel nose nose-exclude cryptography"
+  # Install sometimes-problematic gRPC-related dependencies
+  - "%CMD_IN_ENV% pip install 'grpcio >= 1.0rc1' gax-google-pubsub-v1 gax-google-logging-v2"
 
 build_script:
   # Build the compiled extension