diff --git a/CHANGES.md b/CHANGES.md
index 6ad891f42ba..e2f0cbb23c6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,6 +3,7 @@
 #### next release (8.3.3)
 
 - Fixes broken point dragging interaction for user drawing in 3d-mode.
+- Added EPSG:7855 to `Proj4Definitions`.
 - [The next improvement]
 
 #### 8.3.2 - 2023-08-11
diff --git a/lib/Map/Vector/Proj4Definitions.ts b/lib/Map/Vector/Proj4Definitions.ts
index b0ed9f9f2d0..c56abf86a98 100644
--- a/lib/Map/Vector/Proj4Definitions.ts
+++ b/lib/Map/Vector/Proj4Definitions.ts
@@ -57,7 +57,9 @@ const Proj4Definitions: Record<string, string> = {
   "EPSG:102100": "EPSG:3857",
   "EPSG:27700":
     "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m +no_defs",
-  "EPSG:7844": "+proj=longlat +ellps=GRS80 +no_defs +type=crs"
+  "EPSG:7844": "+proj=longlat +ellps=GRS80 +no_defs +type=crs",
+  "EPSG:7855":
+    "+proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs"
 };
 
 export default Proj4Definitions;