diff --git a/apis/workflows/v1/automation.proto b/apis/workflows/v1/automation.proto
index 380ca75..07f45a7 100644
--- a/apis/workflows/v1/automation.proto
+++ b/apis/workflows/v1/automation.proto
@@ -89,7 +89,7 @@ message StorageEventTrigger {
   // The storage location to watch for events
   StorageLocation storage_location = 2;
   // A glob pattern to match objects/files in the storage location
-  string glob_pattern = 3 [(buf.validate.field).string.min_bytes = 1];
+  string glob_pattern = 3 [(buf.validate.field).string.min_len = 1];
 }
 
 // CronTrigger is a trigger that will trigger a task submission on a schedule.
@@ -97,7 +97,7 @@ message CronTrigger {
   // Unique identifier for the trigger
   tilebox.v1.ID id = 1;
   // A cron schedule for the trigger, e.g. "0 0 * * *" (every day at midnight)
-  string schedule = 2 [(buf.validate.field).string.min_bytes = 1];
+  string schedule = 2 [(buf.validate.field).string.min_len = 1];
 }
 
 // Automation is an actual submitted task that was triggered by a automation prototype.
diff --git a/apis/workflows/v1/core.proto b/apis/workflows/v1/core.proto
index 165a54b..889fc2e 100644
--- a/apis/workflows/v1/core.proto
+++ b/apis/workflows/v1/core.proto
@@ -133,7 +133,7 @@ message TaskSubmission {
   // The serialized task instance
   bytes input = 3 [(buf.validate.field).bytes.max_len = 1024];
   // A human-readable description of the task
-  string display = 4 [(buf.validate.field).string.min_bytes = 1];
+  string display = 4 [(buf.validate.field).string.min_len = 1];
   // A list of indices, corresponding to tasks in the list of sub_tasks that this SubTask is part of.
   repeated int64 dependencies = 5 [(buf.validate.field).repeated.items.int64 = {
     gte: 0
diff --git a/apis/workflows/v1/job.proto b/apis/workflows/v1/job.proto
index ee285c2..28930c7 100644
--- a/apis/workflows/v1/job.proto
+++ b/apis/workflows/v1/job.proto
@@ -20,9 +20,9 @@ message SubmitJobRequest {
     max_items: 64
   }];
   // The name of the job.
-  string job_name = 2 [(buf.validate.field).string.min_bytes = 1];
+  string job_name = 2 [(buf.validate.field).string.min_len = 1];
   // Tracing information for the job. This is used to propagate tracing information to the workers that execute the job.
-  string trace_parent = 3 [(buf.validate.field).string.min_bytes = 1];
+  string trace_parent = 3 [(buf.validate.field).string.min_len = 1];
   // Optional. The ID of the automation that submits this job.
   tilebox.v1.ID automation_id = 4;
 }
@@ -82,12 +82,16 @@ message VisualizeJobRequest {
 
 // QueryFilters contains the filters to apply to a query.
 message QueryFilters {
-  // Either a time interval or ID interval must be set, but not both.
-  oneof temporal_extent {
-    option (buf.validate.oneof).required = true;
-    tilebox.v1.TimeInterval time_interval = 1;
-    tilebox.v1.IDInterval id_interval = 2;
-  }
+  option (buf.validate.message).oneof = {
+    fields: [
+      "time_interval",
+      "id_interval"
+    ]
+    required: true
+  };
+
+  tilebox.v1.TimeInterval time_interval = 1;
+  tilebox.v1.IDInterval id_interval = 2;
 
   // Filter jobs by automation id.
   tilebox.v1.ID automation_id = 3 [features.field_presence = EXPLICIT];
@@ -133,7 +137,7 @@ message CloneJobRequest {
     max_items: 64
   }];
   // The name of the job.
-  string job_name = 3 [(buf.validate.field).string.min_bytes = 1];
+  string job_name = 3 [(buf.validate.field).string.min_len = 1];
 }
 
 // A service for interacting with jobs.
diff --git a/apis/workflows/v1/task.proto b/apis/workflows/v1/task.proto
index 99a0392..b3a54fb 100644
--- a/apis/workflows/v1/task.proto
+++ b/apis/workflows/v1/task.proto
@@ -23,7 +23,7 @@ message NextTaskRequest {
 // tasks that can be run by that task runner.
 message NextTaskToRun {
   // The cluster that this task runner is running on.
-  string cluster_slug = 1 [(buf.validate.field).string.min_bytes = 1];
+  string cluster_slug = 1 [(buf.validate.field).string.min_len = 1];
   // The task identifiers that this task runner can run.
   repeated TaskIdentifier identifiers = 2;
 }
@@ -61,7 +61,7 @@ message TaskStateResponse {
 // TaskLease is a message specifying the new lease expiration time of a task.
 message TaskLeaseRequest {
   tilebox.v1.ID task_id = 1 [(buf.validate.field).required = true];
-  google.protobuf.Duration requested_lease = 2 [features.field_presence = EXPLICIT];
+  google.protobuf.Duration requested_lease = 2;
 }
 
 // A service for task runners to communicate with the workflows service.
diff --git a/apis/workflows/v1/workflows.proto b/apis/workflows/v1/workflows.proto
index 3118607..8932a79 100644
--- a/apis/workflows/v1/workflows.proto
+++ b/apis/workflows/v1/workflows.proto
@@ -12,7 +12,7 @@ option features.field_presence = IMPLICIT;
 // CreateClusterRequest creates a new cluster.
 message CreateClusterRequest {
   // The name of the cluster.
-  string name = 1 [(buf.validate.field).string.min_bytes = 1];
+  string name = 1 [(buf.validate.field).string.min_len = 1];
 }
 
 // GetClusterRequest requests details for a cluster.
@@ -24,7 +24,7 @@ message GetClusterRequest {
 // DeleteClusterRequest deletes an existing cluster.
 message DeleteClusterRequest {
   // The slug of the cluster to delete.
-  string cluster_slug = 1 [(buf.validate.field).string.min_bytes = 1];
+  string cluster_slug = 1 [(buf.validate.field).string.min_len = 1];
 }
 
 // DeleteClusterResponse is the response to DeleteClusterRequest.