Bump 1.8.0-dev to 1.9.0-dev
diff --git a/src/objective-c/tests/version.h b/src/objective-c/tests/version.h
index 0251506..6e3a073 100644
--- a/src/objective-c/tests/version.h
+++ b/src/objective-c/tests/version.h
@@ -23,5 +23,5 @@
 // `tools/buildgen/generate_projects.sh`.
 
 
-#define GRPC_OBJC_VERSION_STRING @"1.8.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.9.0-dev"
 #define GRPC_C_VERSION_STRING @"5.0.0-dev"