diff --git a/Cargo.lock b/Cargo.lock
index 291ac9d47f7..bfa6b653209 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -750,7 +750,7 @@ checksum = "4bb454f0228b18c7f4c3b0ebbee346ed9c52e7443b0999cd543ff3571205701d"
 [[package]]
 name = "dropshot"
 version = "0.6.1-dev"
-source = "git+https://github.com/oxidecomputer/dropshot?branch=main#ff33033ad3d7fcf32caa352d76fc243bd20db176"
+source = "git+https://github.com/oxidecomputer/dropshot?branch=main#e145e9bf23231edca18eb7005fff936998517fda"
 dependencies = [
  "async-trait",
  "base64",
@@ -785,7 +785,7 @@ dependencies = [
 [[package]]
 name = "dropshot_endpoint"
 version = "0.6.1-dev"
-source = "git+https://github.com/oxidecomputer/dropshot?branch=main#ff33033ad3d7fcf32caa352d76fc243bd20db176"
+source = "git+https://github.com/oxidecomputer/dropshot?branch=main#e145e9bf23231edca18eb7005fff936998517fda"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/nexus/src/external_api/http_entrypoints.rs b/nexus/src/external_api/http_entrypoints.rs
index aa8637fe9e7..7cea9bb6c5c 100644
--- a/nexus/src/external_api/http_entrypoints.rs
+++ b/nexus/src/external_api/http_entrypoints.rs
@@ -22,6 +22,7 @@ use dropshot::HttpResponseAccepted;
 use dropshot::HttpResponseCreated;
 use dropshot::HttpResponseDeleted;
 use dropshot::HttpResponseOk;
+use dropshot::HttpResponseUpdatedNoContent;
 use dropshot::Path;
 use dropshot::Query;
 use dropshot::RequestContext;
@@ -1143,7 +1144,7 @@ async fn project_vpcs_put_vpc(
     rqctx: Arc<RequestContext<Arc<ServerContext>>>,
     path_params: Path<VpcPathParam>,
     updated_vpc: TypedBody<params::VpcUpdate>,
-) -> Result<HttpResponseOk<()>, HttpError> {
+) -> Result<HttpResponseUpdatedNoContent, HttpError> {
     let apictx = rqctx.context();
     let nexus = &apictx.nexus;
     let path = path_params.into_inner();
@@ -1156,7 +1157,7 @@ async fn project_vpcs_put_vpc(
                 &updated_vpc.into_inner(),
             )
             .await?;
-        Ok(HttpResponseOk(()))
+        Ok(HttpResponseUpdatedNoContent())
     };
     apictx.external_latencies.instrument_dropshot_handler(&rqctx, handler).await
 }
@@ -1328,7 +1329,7 @@ async fn vpc_subnets_put_subnet(
     rqctx: Arc<RequestContext<Arc<ServerContext>>>,
     path_params: Path<VpcSubnetPathParam>,
     subnet_params: TypedBody<params::VpcSubnetUpdate>,
-) -> Result<HttpResponseOk<()>, HttpError> {
+) -> Result<HttpResponseUpdatedNoContent, HttpError> {
     let apictx = rqctx.context();
     let nexus = &apictx.nexus;
     let path = path_params.into_inner();
@@ -1342,7 +1343,7 @@ async fn vpc_subnets_put_subnet(
                 &subnet_params.into_inner(),
             )
             .await?;
-        Ok(HttpResponseOk(()))
+        Ok(HttpResponseUpdatedNoContent())
     };
     apictx.external_latencies.instrument_dropshot_handler(&rqctx, handler).await
 }
@@ -1564,7 +1565,7 @@ async fn vpc_routers_put_router(
     rqctx: Arc<RequestContext<Arc<ServerContext>>>,
     path_params: Path<VpcRouterPathParam>,
     router_params: TypedBody<params::VpcRouterUpdate>,
-) -> Result<HttpResponseOk<()>, HttpError> {
+) -> Result<HttpResponseUpdatedNoContent, HttpError> {
     let apictx = rqctx.context();
     let nexus = &apictx.nexus;
     let path = path_params.into_inner();
@@ -1578,7 +1579,7 @@ async fn vpc_routers_put_router(
                 &router_params.into_inner(),
             )
             .await?;
-        Ok(HttpResponseOk(()))
+        Ok(HttpResponseUpdatedNoContent())
     };
     apictx.external_latencies.instrument_dropshot_handler(&rqctx, handler).await
 }
@@ -1734,7 +1735,7 @@ async fn routers_routes_put_route(
     rqctx: Arc<RequestContext<Arc<ServerContext>>>,
     path_params: Path<RouterRoutePathParam>,
     router_params: TypedBody<RouterRouteUpdateParams>,
-) -> Result<HttpResponseOk<()>, HttpError> {
+) -> Result<HttpResponseUpdatedNoContent, HttpError> {
     let apictx = rqctx.context();
     let nexus = &apictx.nexus;
     let path = path_params.into_inner();
@@ -1749,7 +1750,7 @@ async fn routers_routes_put_route(
                 &router_params.into_inner(),
             )
             .await?;
-        Ok(HttpResponseOk(()))
+        Ok(HttpResponseUpdatedNoContent())
     };
     apictx.external_latencies.instrument_dropshot_handler(&rqctx, handler).await
 }
diff --git a/nexus/tests/test_router_routes.rs b/nexus/tests/test_router_routes.rs
index e7ae6e72df5..ec4859223ed 100644
--- a/nexus/tests/test_router_routes.rs
+++ b/nexus/tests/test_router_routes.rs
@@ -146,7 +146,7 @@ async fn test_router_routes() {
                     "loopback".parse().unwrap(),
                 ),
             }),
-            StatusCode::OK,
+            StatusCode::NO_CONTENT,
         )
         .await
         .unwrap();
diff --git a/nexus/tests/test_vpc_routers.rs b/nexus/tests/test_vpc_routers.rs
index 81c81f9f2ec..3538e4734c5 100644
--- a/nexus/tests/test_vpc_routers.rs
+++ b/nexus/tests/test_vpc_routers.rs
@@ -138,7 +138,7 @@ async fn test_vpc_routers() {
             Method::PUT,
             &router_url,
             Some(update_params),
-            StatusCode::OK,
+            StatusCode::NO_CONTENT,
         )
         .await
         .unwrap();
diff --git a/nexus/tests/test_vpc_subnets.rs b/nexus/tests/test_vpc_subnets.rs
index d93bf8b0e31..103c6f7b34c 100644
--- a/nexus/tests/test_vpc_subnets.rs
+++ b/nexus/tests/test_vpc_subnets.rs
@@ -181,7 +181,7 @@ async fn test_vpc_subnets() {
             Method::PUT,
             &subnet_url,
             Some(update_params),
-            StatusCode::OK,
+            StatusCode::NO_CONTENT,
         )
         .await
         .unwrap();
diff --git a/nexus/tests/test_vpcs.rs b/nexus/tests/test_vpcs.rs
index 2e4355edc96..176be42cca2 100644
--- a/nexus/tests/test_vpcs.rs
+++ b/nexus/tests/test_vpcs.rs
@@ -149,7 +149,12 @@ async fn vpc_put(
     params: params::VpcUpdate,
 ) {
     client
-        .make_request(Method::PUT, &vpc_url, Some(params), StatusCode::OK)
+        .make_request(
+            Method::PUT,
+            &vpc_url,
+            Some(params),
+            StatusCode::NO_CONTENT,
+        )
         .await
         .unwrap();
 }
diff --git a/openapi/nexus.json b/openapi/nexus.json
index d56bd3a7edf..fe25cc358df 100644
--- a/openapi/nexus.json
+++ b/openapi/nexus.json
@@ -1522,8 +1522,8 @@
           "required": true
         },
         "responses": {
-          "200": {
-            "description": "successful operation"
+          "204": {
+            "description": "resource updated"
           }
         }
       },
@@ -1939,8 +1939,8 @@
           "required": true
         },
         "responses": {
-          "200": {
-            "description": "successful operation"
+          "204": {
+            "description": "resource updated"
           }
         }
       },
@@ -2268,8 +2268,8 @@
           "required": true
         },
         "responses": {
-          "200": {
-            "description": "successful operation"
+          "204": {
+            "description": "resource updated"
           }
         }
       },
@@ -2570,8 +2570,8 @@
           "required": true
         },
         "responses": {
-          "200": {
-            "description": "successful operation"
+          "204": {
+            "description": "resource updated"
           }
         }
       },