diff --git a/package.json b/package.json
index f11c2d2725..8ae6989563 100644
--- a/package.json
+++ b/package.json
@@ -128,7 +128,7 @@
     "mapv": "2.0.56",
     "ol": "6.4.3",
     "pbf": "3.2.1",
-    "proj4": "2.6.2",
+    "proj4": "2.6.3",
     "promise-polyfill": "8.2.0",
     "three": "0.121.1",
     "xlsx": "0.16.8",
diff --git a/src/leaflet/package.json b/src/leaflet/package.json
index 3aa2310f35..25176835c9 100644
--- a/src/leaflet/package.json
+++ b/src/leaflet/package.json
@@ -22,7 +22,7 @@
     "@mapbox/vector-tile": "1.3.1",
     "jsonsql": "0.2.5",
     "pbf": "3.2.1",
-    "proj4": "2.6.2",
+    "proj4": "2.6.3",
     "xlsx": "0.16.8"
   }
 }
diff --git a/src/openlayers/package.json b/src/openlayers/package.json
index 9b961d65c6..93f95e373b 100644
--- a/src/openlayers/package.json
+++ b/src/openlayers/package.json
@@ -19,7 +19,7 @@
     "mapv": "2.0.56",
     "ol": "6.4.3",
     "@supermap/iclient-common": "10.1.1",
-    "proj4": "2.6.2",
+    "proj4": "2.6.3",
     "xlsx": "0.16.8",
     "canvg": "3.0.7",
     "lodash.remove": "^4.7.0"