diff --git a/package-lock.json b/package-lock.json
index cbb99b4..699bb8e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -32,7 +32,6 @@
         "morgan": "1.10.0",
         "pbf": "4.0.1",
         "pmtiles": "3.0.7",
-        "pngjs": "^7.0.0",
         "proj4": "2.12.1",
         "sanitize-filename": "1.6.3",
         "sharp": "0.33.5",
@@ -6623,14 +6622,6 @@
         "fflate": "^0.8.0"
       }
     },
-    "node_modules/pngjs": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
-      "integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow==",
-      "engines": {
-        "node": ">=14.19.0"
-      }
-    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
diff --git a/package.json b/package.json
index 2503ebe..d7070cc 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,6 @@
     "morgan": "1.10.0",
     "pbf": "4.0.1",
     "pmtiles": "3.0.7",
-    "pngjs": "^7.0.0",
     "proj4": "2.12.1",
     "sanitize-filename": "1.6.3",
     "sharp": "0.33.5",
diff --git a/src/contour.js b/src/contour.js
index d9cb768..82e774d 100644
--- a/src/contour.js
+++ b/src/contour.js
@@ -1,7 +1,6 @@
 import sharp from 'sharp';
 import mlcontour from '../node_modules/maplibre-contour/dist/index.mjs';
 import { getPMtilesTile } from './pmtiles_adapter.js';
-import { PNG } from 'pngjs';
 
 /**
  * Manages local DEM (Digital Elevation Model) data using maplibre-contour.