diff --git a/CHANGELOG.md b/CHANGELOG.md
index 669021b81..1348f1b74 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+## [5.8.0] - 2024-02-03
+### Added
+- Support for compressed grid files to reduce distribution sizes
+
 ## [5.7.0] - 2024-01-27
 ### Changed
 - Updates to data for Canada, Denmark, France, Germany and USA
@@ -317,8 +321,9 @@ Initial release of this fork (based off of v2.3 of original)
  - Eastings and northings are rounded to 1m, and lat/long to 5dp (approx 1m) to avoid any misconceptions that precision is the same thing as accuracy.
  - When calculating surface distances, a more accurate mean radius is now used rather than that derived from historical definitions of a nautical mile
 
-[Unreleased]: https://github.com/dvdoug/PHPCoord/compare/v5.7.0..master
+[Unreleased]: https://github.com/dvdoug/PHPCoord/compare/v5.8.0..master
 
+[5.8.0]: https://github.com/dvdoug/PHPCoord/compare/v5.7.0..v5.8.0
 [5.7.0]: https://github.com/dvdoug/PHPCoord/compare/v5.6.0..v5.7.0
 [5.6.0]: https://github.com/dvdoug/PHPCoord/compare/v5.5.0..v5.6.0
 [5.5.0]: https://github.com/dvdoug/PHPCoord/compare/v5.4.0..v5.5.0
diff --git a/composer.json b/composer.json
index befb91449..5f2f5137c 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,7 @@
     "license": "(MIT and proprietary)",
     "require": {
         "php": "^8.0",
+        "ext-zip": "*",
         "composer-runtime-api": "^2.1",
         "composer/pcre": "^3.1",
         "opis/json-schema": "^2.3"
diff --git a/src/CoordinateOperation/GridFile.php b/src/CoordinateOperation/GridFile.php
index 6db963910..fa244b54f 100644
--- a/src/CoordinateOperation/GridFile.php
+++ b/src/CoordinateOperation/GridFile.php
@@ -9,14 +9,33 @@
 namespace PHPCoord\CoordinateOperation;
 
 use SplFileObject;
+use ZipArchive;
 
 use function assert;
+use function file_exists;
+use function sys_get_temp_dir;
+use function str_ends_with;
 
 /**
  * @internal
  */
 class GridFile extends SplFileObject
 {
+    public function __construct(string $filename)
+    {
+        if (str_ends_with($filename, '.zip')) {
+            $zip = new ZipArchive();
+            $zip->open($filename);
+            $filename = sys_get_temp_dir() . '/' . $zip->getNameIndex(0); // only 1 file inside
+
+            if (!file_exists($filename)) {
+                $zip->extractTo(sys_get_temp_dir());
+            }
+        }
+
+        parent::__construct($filename);
+    }
+
     public function fgets(): string
     {
         $result = parent::fgets();