diff --git a/package-lock.json b/package-lock.json
index dc11974e..ce23142b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12947,6 +12947,13 @@
         "url-loader": "^1.1.2",
         "webpack": "^4.29.5",
         "worker-loader": "^2.0.0"
+      },
+      "dependencies": {
+        "pell": {
+          "version": "git://github.com/TerriaJS/pell.git#7cd23a55cdfd130fedf3679433991bb7d958fc42",
+          "from": "git://github.com/TerriaJS/pell.git#master",
+          "dev": true
+        }
       }
     },
     "terriajs-catalog-editor": {
@@ -13681,9 +13688,9 @@
       }
     },
     "urijs": {
-      "version": "1.19.2",
-      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.2.tgz",
-      "integrity": "sha512-s/UIq9ap4JPZ7H1EB5ULo/aOUbWqfDi7FKzMC2Nz+0Si8GiT1rIEaprt8hy3Vy2Ex2aJPpOQv4P4DuOZ+K1c6w==",
+      "version": "1.19.6",
+      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.6.tgz",
+      "integrity": "sha512-eSXsXZ2jLvGWeLYlQA3Gh36BcjF+0amo92+wHPyN1mdR8Nxf75fuEuYTd9c0a+m/vhCjRK0ESlE9YNLW+E1VEw==",
       "dev": true
     },
     "urix": {
diff --git a/package.json b/package.json
index c28c551a..6ddb0b57 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "terriajs-catalog-editor": "^0.2.0",
     "terriajs-cesium": "1.68.0",
     "terriajs-schema": "latest",
-    "urijs": "^1.18.12",
+    "urijs": "^1.19.6",
     "url-loader": "^1.1.2",
     "webpack": "^4.29.5",
     "webpack-cli": "^3.2.2",
diff --git a/yarn.lock b/yarn.lock
index fbab4604..f4404eba 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10278,10 +10278,10 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-urijs@^1.18.12:
-  version "1.19.2"
-  resolved "https://registry.yarnpkg.com/urijs/-/urijs-1.19.2.tgz#f9be09f00c4c5134b7cb3cf475c1dd394526265a"
-  integrity sha512-s/UIq9ap4JPZ7H1EB5ULo/aOUbWqfDi7FKzMC2Nz+0Si8GiT1rIEaprt8hy3Vy2Ex2aJPpOQv4P4DuOZ+K1c6w==
+urijs@^1.18.12, urijs@^1.19.6:
+  version "1.19.6"
+  resolved "https://registry.yarnpkg.com/urijs/-/urijs-1.19.6.tgz#51f8cb17ca16faefb20b9a31ac60f84aa2b7c870"
+  integrity sha512-eSXsXZ2jLvGWeLYlQA3Gh36BcjF+0amo92+wHPyN1mdR8Nxf75fuEuYTd9c0a+m/vhCjRK0ESlE9YNLW+E1VEw==
 
 urix@^0.1.0:
   version "0.1.0"