diff --git a/__snapshots__/index.test.js.snap b/__snapshots__/index.test.js.snap
index 8da5eaf..e52c509 100644
--- a/__snapshots__/index.test.js.snap
+++ b/__snapshots__/index.test.js.snap
@@ -1,3 +1,5 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
 exports[`lonlat errors invalid coordinates should throw error when parsing: "-999,999" 1`] = `"Invalid longitude value: -999"`;
 
 exports[`lonlat errors invalid coordinates should throw error when parsing: "0,999" 1`] = `"Invalid latitude value: 999"`;
diff --git a/package.json b/package.json
index a44bca7..c1a8838 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
   "homepage": "https://github.com/conveyal/lonlat",
   "devDependencies": {
     "documentation": "^4.0.0-beta.18",
-    "mastarm": "^3.2.1",
+    "mastarm": "^3.5.1",
     "semantic-release": "^6.3.2"
   }
 }