diff --git a/package.json b/package.json
index d0b339e..0cc66d0 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "fontfaceobserver": "^2.3.0",
     "geojson": "^0.5.0",
     "ol": "^9.1.0",
-    "ol-ext": "^4.0.21",
+    "ol-ext": "4.0.18",
     "ol-mapbox-style": "^12.3.4"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 66012a6..3ab1998 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -634,11 +634,6 @@ fastest-levenshtein@^1.0.12:
   resolved "https://registry.npmjs.org/fastest-levenshtein/-/fastest-levenshtein-1.0.16.tgz"
   integrity sha512-eRnCtTTtGZFpQCwhJiUOuxPQWRXVKYDn0b2PeHfXL6/Zi53SLAzAHfVhVWK2AryC/WH05kGfxhFIPvTF0SXQzg==
 
-fflate@^0.4.8:
-  version "0.4.8"
-  resolved "https://registry.npmjs.org/fflate/-/fflate-0.4.8.tgz"
-  integrity sha512-FJqqoDBR00Mdj9ppamLa/Y7vxm+PRmNWA67N846RvsoYVMKB4q3y/de5PA7gUmRMYK/8CMz2GDZQmCRN1wBcWA==
-
 fill-range@^7.1.1:
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-7.1.1.tgz#44265d3cac07e3ea7dc247516380643754a05292"
@@ -900,10 +895,10 @@ normalize-path@^3.0.0, normalize-path@~3.0.0:
   resolved "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz"
   integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
 
-ol-ext@^4.0.21:
-  version "4.0.21"
-  resolved "https://registry.yarnpkg.com/ol-ext/-/ol-ext-4.0.21.tgz#78ba613d1b95e66629c3ce252da6f8367ba0f3eb"
-  integrity sha512-xP4oVD5KBvJW6P9UQwmPcgqMDh6nzUrHjle4qhNqzRW7OkP02mObw5UMGAgz+uhIW8doJ3hYCwy2HcpU1JFpig==
+ol-ext@4.0.18:
+  version "4.0.18"
+  resolved "https://registry.yarnpkg.com/ol-ext/-/ol-ext-4.0.18.tgz#87e68566bae1a7821e3a1af8b7019409ce922324"
+  integrity sha512-zzeTAoCg9IocaM7LlXiLNnVCgVmfxxLzlDTWvYn3Y2gFxtICHSfRrIQl/8vumgBjftBksVl1Fds8P5uFReTmew==
 
 ol-mapbox-style@^12.3.4:
   version "12.3.4"