diff --git a/package.json b/package.json
index f36b8fa..d102c1f 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,6 @@
   ],
   "dependencies": {},
   "devDependencies": {
-    "mapshaper": "^0.6.25"
+    "mapshaper": "^0.6.67"
   }
 }
diff --git a/website/package.json b/website/package.json
index 87948a9..312302e 100644
--- a/website/package.json
+++ b/website/package.json
@@ -23,7 +23,7 @@
     "immer": "^9.0.21",
     "io-ts": "^2.2.20",
     "jss": "^10.10.0",
-    "mapshaper": "^0.6.25",
+    "mapshaper": "^0.6.67",
     "next": "^13.2.4",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
diff --git a/website/yarn.lock b/website/yarn.lock
index 0384a67..d06a4e7 100644
--- a/website/yarn.lock
+++ b/website/yarn.lock
@@ -1459,10 +1459,10 @@ loose-envify@^1.1.0, loose-envify@^1.4.0:
   dependencies:
     js-tokens "^3.0.0 || ^4.0.0"
 
-mapshaper@^0.6.25:
-  version "0.6.25"
-  resolved "https://registry.yarnpkg.com/mapshaper/-/mapshaper-0.6.25.tgz#dedd7fb54dddd0e3f4af8e72bbb5745efc6bc82d"
-  integrity sha512-Np5LImN5Pdnp1R1H9RMoAZj0MA8parOmVj4MIFuHl1xQ1vNMDRC4ZvtAFYNqeOEncsUZqsMsBHjxCehi4qcWvw==
+mapshaper@^0.6.67:
+  version "0.6.67"
+  resolved "https://registry.yarnpkg.com/mapshaper/-/mapshaper-0.6.67.tgz#c4176864986779a15f28017e382ee83b4593ae59"
+  integrity sha512-aBuTfdkQ/m2IjLcyPAwIE3DIa+9r9buGofGHB1J714zGSmwkSo7byMNL7SE3aFe8hIcY15IRGy7snEw8qdAhAQ==
   dependencies:
     "@placemarkio/tokml" "^0.3.3"
     "@tmcw/togeojson" "^5.6.0"
@@ -1480,7 +1480,7 @@ mapshaper@^0.6.25:
     iconv-lite "^0.6.3"
     idb-keyval "^6.2.0"
     kdbush "^3.0.0"
-    mproj "0.0.35"
+    mproj "0.0.37"
     msgpackr "^1.8.5"
     opn "^5.3.0"
     rw "~1.3.3"
@@ -1534,10 +1534,10 @@ mjolnir.js@^2.7.0:
     "@types/hammerjs" "^2.0.41"
     hammerjs "^2.0.8"
 
-mproj@0.0.35:
-  version "0.0.35"
-  resolved "https://registry.yarnpkg.com/mproj/-/mproj-0.0.35.tgz#8a9f8f5e9822c530691476c951dc126fbce084ca"
-  integrity sha512-xqO9BXjTezwyPFbAShWRkYZ98DD9wWOyr86WX6miWq3brBNGypsErMmobpUx3G45SrfvyJ5jI997Zw0qr7Ko7A==
+mproj@0.0.37:
+  version "0.0.37"
+  resolved "https://registry.yarnpkg.com/mproj/-/mproj-0.0.37.tgz#19eef15bf1cb940d23590d19a32142c816cb785e"
+  integrity sha512-UtLQa2UyFQJuwqpLWd6TF3xYNE7nGTQWvwtXHBdpEAn8F/QHP1yTjqvo2CaQem9LcSQoiZLCHP1fRU4uCWzBVw==
   dependencies:
     geographiclib "1.48.0"
     rw "~1.3.2"
diff --git a/yarn.lock b/yarn.lock
index 1e44aaa..99c40ec 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -320,10 +320,10 @@ keygrip@~1.1.0:
   dependencies:
     tsscmp "1.0.6"
 
-mapshaper@^0.6.25:
-  version "0.6.25"
-  resolved "https://registry.yarnpkg.com/mapshaper/-/mapshaper-0.6.25.tgz#dedd7fb54dddd0e3f4af8e72bbb5745efc6bc82d"
-  integrity sha512-Np5LImN5Pdnp1R1H9RMoAZj0MA8parOmVj4MIFuHl1xQ1vNMDRC4ZvtAFYNqeOEncsUZqsMsBHjxCehi4qcWvw==
+mapshaper@^0.6.67:
+  version "0.6.67"
+  resolved "https://registry.yarnpkg.com/mapshaper/-/mapshaper-0.6.67.tgz#c4176864986779a15f28017e382ee83b4593ae59"
+  integrity sha512-aBuTfdkQ/m2IjLcyPAwIE3DIa+9r9buGofGHB1J714zGSmwkSo7byMNL7SE3aFe8hIcY15IRGy7snEw8qdAhAQ==
   dependencies:
     "@placemarkio/tokml" "^0.3.3"
     "@tmcw/togeojson" "^5.6.0"
@@ -341,7 +341,7 @@ mapshaper@^0.6.25:
     iconv-lite "^0.6.3"
     idb-keyval "^6.2.0"
     kdbush "^3.0.0"
-    mproj "0.0.35"
+    mproj "0.0.37"
     msgpackr "^1.8.5"
     opn "^5.3.0"
     rw "~1.3.3"
@@ -360,10 +360,10 @@ mime-types@^2.1.12:
   dependencies:
     mime-db "1.49.0"
 
-mproj@0.0.35:
-  version "0.0.35"
-  resolved "https://registry.yarnpkg.com/mproj/-/mproj-0.0.35.tgz#8a9f8f5e9822c530691476c951dc126fbce084ca"
-  integrity sha512-xqO9BXjTezwyPFbAShWRkYZ98DD9wWOyr86WX6miWq3brBNGypsErMmobpUx3G45SrfvyJ5jI997Zw0qr7Ko7A==
+mproj@0.0.37:
+  version "0.0.37"
+  resolved "https://registry.yarnpkg.com/mproj/-/mproj-0.0.37.tgz#19eef15bf1cb940d23590d19a32142c816cb785e"
+  integrity sha512-UtLQa2UyFQJuwqpLWd6TF3xYNE7nGTQWvwtXHBdpEAn8F/QHP1yTjqvo2CaQem9LcSQoiZLCHP1fRU4uCWzBVw==
   dependencies:
     geographiclib "1.48.0"
     rw "~1.3.2"