diff --git a/Cargo.lock b/Cargo.lock
index 15786de88d..1a763824a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3516,9 +3516,9 @@ dependencies = [
 
 [[package]]
 name = "pgwire"
-version = "0.3.2"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41526874eeba2f8b06a3ed14510e29080b9fab15b86849fb3a7a733c9bc610b0"
+checksum = "9e30e99a0b8acf60a6815aa8178e9ffb08178ef3ca1366673bb0d6c7ababe4c2"
 dependencies = [
  "async-trait",
  "bytes",
diff --git a/src/servers/Cargo.toml b/src/servers/Cargo.toml
index 6767d0fd17..f287ae28c3 100644
--- a/src/servers/Cargo.toml
+++ b/src/servers/Cargo.toml
@@ -26,7 +26,7 @@ influxdb_line_protocol = { git = "https://github.com/evenyag/influxdb_iox", bran
 metrics = "0.20"
 num_cpus = "1.13"
 opensrv-mysql = "0.1"
-pgwire = { version = "0.3" }
+pgwire = { version = "0.4" }
 query = { path = "../query" }
 serde = "1.0"
 serde_json = "1.0"
diff --git a/src/servers/src/postgres/handler.rs b/src/servers/src/postgres/handler.rs
index c0ff2e2a87..4c500403af 100644
--- a/src/servers/src/postgres/handler.rs
+++ b/src/servers/src/postgres/handler.rs
@@ -27,7 +27,7 @@ impl PostgresServerHandler {
 
 #[async_trait]
 impl SimpleQueryHandler for PostgresServerHandler {
-    async fn do_query<C>(&self, _client: &C, query: &str) -> PgWireResult<Response>
+    async fn do_query<C>(&self, _client: &C, query: &str) -> PgWireResult<Vec<Response>>
     where
         C: ClientInfo + Unpin + Send + Sync,
     {
@@ -38,10 +38,10 @@ impl SimpleQueryHandler for PostgresServerHandler {
             .map_err(|e| PgWireError::ApiError(Box::new(e)))?;
 
         match output {
-            Output::AffectedRows(rows) => Ok(Response::Execution(Tag::new_for_execution(
+            Output::AffectedRows(rows) => Ok(vec![Response::Execution(Tag::new_for_execution(
                 "OK",
                 Some(rows),
-            ))),
+            ))]),
             Output::Stream(record_stream) => {
                 let schema = record_stream.schema();
                 let recordbatches = util::collect(record_stream)
@@ -60,7 +60,7 @@ impl SimpleQueryHandler for PostgresServerHandler {
 fn recordbatches_to_query_response<'a, I>(
     recordbatches: I,
     schema: SchemaRef,
-) -> PgWireResult<Response>
+) -> PgWireResult<Vec<Response>>
 where
     I: Iterator<Item = &'a RecordBatch>,
 {
@@ -77,7 +77,7 @@ where
         }
     }
 
-    Ok(Response::Query(builder.build()))
+    Ok(vec![Response::Query(builder.build())])
 }
 
 fn schema_to_pg(origin: SchemaRef) -> Result<Vec<FieldInfo>> {