diff --git a/Makefile b/Makefile
index d049cf3..c9646db 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-BUF_VERSION=v1.6.0
+BUF_VERSION=v1.28.0
 TAG=protobuf-v0.1.4
 guard-%:
 	@ if [ "${${*}}" = "" ]; then \
diff --git a/protobuf/schema/v1/schema.proto b/protobuf/schema/v1/schema.proto
index 503af2c..048e65c 100644
--- a/protobuf/schema/v1/schema.proto
+++ b/protobuf/schema/v1/schema.proto
@@ -75,10 +75,27 @@ message RemoveConfigResponse {
 }
 
 message Cache {
+  oneof cache_type {
+    S3Cache s3_cache = 1;
+    AzureCache azure_cache = 2;
+    GCSCache gcs_cache = 3;
+  }
+}
+
+message S3Cache {
+  string region = 1;
+  string bucket_name = 2;
+}
+
+message AzureCache {
+  string storage_account = 1;
+  string container_name = 2;
+}
+
+message GCSCache {
   string region = 1;
   string bucket_name = 2;
-  string storage_account = 3;
-  string container_name = 4;
+  string project_id = 3;
 }
 
 message Trivy {