diff --git a/ui/package.json b/ui/package.json
index a1a172a7..0666dad1 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -53,7 +53,7 @@
     "mapbox-gl-style-switcher": "^1.0.11",
     "maplibre-gl": "5.24.0",
     "ol": "^10.9.0",
-    "proj4": "^2.20.8",
+    "proj4": "^2.20.9",
     "react": "^19.2.6",
     "react-autocomplete-hint": "^2.0.0",
     "react-dom": "^19.2.6",
diff --git a/ui/yarn.lock b/ui/yarn.lock
index 67a80b75..2ff34ace 100644
--- a/ui/yarn.lock
+++ b/ui/yarn.lock
@@ -8257,13 +8257,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"proj4@npm:^2.20.8":
-  version: 2.20.8
-  resolution: "proj4@npm:2.20.8"
+"proj4@npm:^2.20.9":
+  version: 2.20.9
+  resolution: "proj4@npm:2.20.9"
   dependencies:
     mgrs: "npm:1.0.0"
     wkt-parser: "npm:^1.5.5"
-  checksum: 10/c400b06df43274335005e1d214706050d71e95c5561458c8e0d15f94dc2015e35a1bcba095aa4b4f4d94841b4188953fbb74a7d0646f613d33edc9a84a582134
+  peerDependencies:
+    geotiff: "*"
+  peerDependenciesMeta:
+    geotiff:
+      optional: true
+  checksum: 10/d1bc9acd843d65d1bca7ef1b92de9902fa0786ddb6b600088c1807812f55d034458d00e772f1342a1739c6c881622c840f406d1fb00d67c4ea84185efa30c2e3
   languageName: node
   linkType: hard
 
@@ -9488,7 +9493,7 @@ __metadata:
     oxfmt: "npm:^0.52.0"
     oxlint: "npm:^1.67.0"
     oxlint-tsgolint: "npm:^0.23.0"
-    proj4: "npm:^2.20.8"
+    proj4: "npm:^2.20.9"
     react: "npm:^19.2.6"
     react-autocomplete-hint: "npm:^2.0.0"
     react-dom: "npm:^19.2.6"