diff --git a/fcos-graph-builder/src/main.rs b/fcos-graph-builder/src/main.rs
index 76c7580..e6ff034 100644
--- a/fcos-graph-builder/src/main.rs
+++ b/fcos-graph-builder/src/main.rs
@@ -73,7 +73,7 @@ fn main() -> Fallible<()> {
             .data(gb_service.clone())
             .route("/v1/graph", web::get().to(gb_serve_graph))
     })
-    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 8080))?
+    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 5050))?
     .run();
 
     // Graph-builder status service.
@@ -83,7 +83,7 @@ fn main() -> Fallible<()> {
             .data(gb_status.clone())
             .route("/metrics", web::get().to(metrics::serve_metrics))
     })
-    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 9080))?
+    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 6060))?
     .run();
 
     sys.run()?;
diff --git a/fcos-policy-engine/src/main.rs b/fcos-policy-engine/src/main.rs
index dc42bb4..6fe6576 100644
--- a/fcos-policy-engine/src/main.rs
+++ b/fcos-policy-engine/src/main.rs
@@ -63,7 +63,7 @@ fn main() -> Fallible<()> {
             .data(pe_service.clone())
             .route("/v1/graph", web::get().to(pe_serve_graph))
     })
-    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 8081))?
+    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 5051))?
     .run();
 
     // Policy-engine status service.
@@ -73,7 +73,7 @@ fn main() -> Fallible<()> {
             .data(pe_status.clone())
             .route("/metrics", web::get().to(metrics::serve_metrics))
     })
-    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 9081))?
+    .bind((IpAddr::from(Ipv4Addr::UNSPECIFIED), 6061))?
     .run();
 
     sys.run()?;
diff --git a/fcos-policy-engine/src/utils.rs b/fcos-policy-engine/src/utils.rs
index ba581f5..38ad108 100644
--- a/fcos-policy-engine/src/utils.rs
+++ b/fcos-policy-engine/src/utils.rs
@@ -7,7 +7,7 @@ use std::time::Duration;
 /// Default timeout for HTTP requests (30 minutes).
 const DEFAULT_HTTP_REQ_TIMEOUT: Duration = Duration::from_secs(30 * 60);
 /// Default address of fcos-graph-builder, which is the same as fcos-policy-builer
-const DEFAULT_GB_ADDR: &str = "http://127.0.0.1:8080/v1/graph";
+const DEFAULT_GB_ADDR: &str = "http://127.0.0.1:5050/v1/graph";
 
 /// Return a request builder with base URL and parameters set.
 fn new_request(
@@ -21,6 +21,7 @@ fn new_request(
     Ok(builder)
 }
 
+/// Fetch the graph from the fcos-graph-builder instance with the query specified.
 pub(crate) fn fetch_graph_from_gb(
     query: String
 ) -> impl Future<Output = Result<graph::Graph, Error>> {