diff --git a/.github/workflows/branch-verify.yml b/.github/workflows/branch-verify.yml
index 699f42e..5e701a9 100644
--- a/.github/workflows/branch-verify.yml
+++ b/.github/workflows/branch-verify.yml
@@ -24,10 +24,10 @@ jobs:
       run: |
         target/debug/osm_extract_polygon -f data/suriname-latest.osm.pbf -g
         echo $(md5sum data/suriname-latest.osm.pbf_polygons/Papaichton.geojson)
-        md5sum data/suriname-latest.osm.pbf_polygons/Papaichton.geojson | cut -c1-32 | awk '$1!="6554ec55b2f7a05cacb8fbe0df3199f2" {err = 1; exit; } END {exit err}'
+        md5sum data/suriname-latest.osm.pbf_polygons/Papaichton.geojson | cut -c1-32 | awk '$1!="0dfccf437c98e4f22988466064589ca7" {err = 1; exit; } END {exit err}'
         md5sum data/suriname-latest.osm.pbf_polygons/Papaichton.poly | cut -c1-32 | awk '$1!="f017f2ca29051e1c9dea687a11f6175e" {err = 1; exit; } END {exit err}'
         echo $(md5sum data/suriname-latest.osm.pbf_polygons/Maripasoula.geojson)
-        md5sum data/suriname-latest.osm.pbf_polygons/Maripasoula.geojson | cut -c1-32 | awk '$1!="934f4d585799776d2f10ef608ad2103f" {err = 1; exit; } END {exit err}'
+        md5sum data/suriname-latest.osm.pbf_polygons/Maripasoula.geojson | cut -c1-32 | awk '$1!="1837993d9e7ca6b16c6fa136a7a98537" {err = 1; exit; } END {exit err}'
         md5sum data/suriname-latest.osm.pbf_polygons/Maripasoula.poly | cut -c1-32 | awk '$1!="d7608f4bd631237a092b9a5777091340" {err = 1; exit; } END {exit err}'
     - name: Push to codecov.io
       env:
diff --git a/Cargo.lock b/Cargo.lock
index c6d9551..030dfa9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -319,7 +319,7 @@ dependencies = [
 
 [[package]]
 name = "osm_extract_polygon"
-version = "0.5.6"
+version = "0.5.7"
 dependencies = [
  "clap",
  "geo-types",
diff --git a/Cargo.toml b/Cargo.toml
index 0f32ec3..5d696d0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "osm_extract_polygon"
-version = "0.5.6"
+version = "0.5.7"
 authors = ["Andreas <andreas.gemsa@googlemail.com>"]
 edition = "2018"
 
diff --git a/src/osm_reader.rs b/src/osm_reader.rs
index 65bd88e..8bdcf0e 100644
--- a/src/osm_reader.rs
+++ b/src/osm_reader.rs
@@ -2,7 +2,6 @@ use osmpbfreader::{Node, NodeId, OsmPbfReader, Relation, RelationId, WayId};
 
 use std::collections::{HashMap, HashSet};
 use std::fs::File;
-use std::i8::MAX;
 use std::path::Path;
 use std::time::Instant;
 
@@ -48,7 +47,7 @@ fn has_proper_admin_level(relation: &Relation, min_admin: &i8, max_admin: &i8) -
         .tags
         .get("admin_level")
         .and_then(|v| v.parse::<i8>().ok())
-        .unwrap_or(MAX);
+        .unwrap_or(i8::MAX);
 
     (*min_admin <= admin_level) && (admin_level <= *max_admin)
 }
diff --git a/src/output/file_writer_geojson.rs b/src/output/file_writer_geojson.rs
index 2f3be13..2a166d6 100644
--- a/src/output/file_writer_geojson.rs
+++ b/src/output/file_writer_geojson.rs
@@ -38,6 +38,7 @@ fn create_properties(polygon: &Polygon) -> Map<String, serde_json::Value> {
     let mut properties = Map::new();
     properties.insert(String::from("name"), to_value(&polygon.name).unwrap());
     properties.insert(String::from("admin_level"), to_value(polygon.admin_level).unwrap());
+    properties.insert(String::from("relation_id"), to_value(polygon.relation_id).unwrap());
     properties
 }