diff --git a/package-lock.json b/package-lock.json
index a57e1e6..de29bd8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -882,9 +882,9 @@
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+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/@open-wc/building-utils/-/building-utils-2.8.1.tgz",
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@@ -931,16 +931,18 @@
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-      "resolved": "https://registry.npmjs.org/@open-wc/karma-esm/-/karma-esm-2.2.8.tgz",
-      "integrity": "sha512-ef3PsAQ2Gr5B1Ww69HhF7safwovGs02x9GeYRQOnCdQyn5ZjjOtM8jDuUui0WmBI/mf0fYFUKKNee6IdCwA/NA==",
+      "version": "2.5.6",
+      "resolved": "https://registry.npmjs.org/@open-wc/karma-esm/-/karma-esm-2.5.6.tgz",
+      "integrity": "sha512-9mzW5B/b8BoyFyANbBWi9VzPkjBFfeGLs9/RafpS2tNxiLccDxgcledFWO3KuoXynml0m0XQ6/GRLmKu0fl/nA==",
       "dev": true,
       "requires": {
-        "@open-wc/building-utils": "^2.5.3",
+        "@open-wc/building-utils": "^2.8.1",
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+        "chokidar": "^3.0.2",
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-        "es-dev-server": "^1.10.2",
+        "es-dev-server": "^1.17.1",
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+        "portfinder": "^1.0.21",
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@@ -1875,9 +1877,9 @@
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-      "resolved": "https://registry.npmjs.org/core-js-bundle/-/core-js-bundle-3.1.4.tgz",
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+      "resolved": "https://registry.npmjs.org/core-js-bundle/-/core-js-bundle-3.2.1.tgz",
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@@ -2238,15 +2240,15 @@
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-      "resolved": "https://registry.npmjs.org/es-dev-server/-/es-dev-server-1.10.2.tgz",
-      "integrity": "sha512-lsmbyh7s5RmecUozqD2dWTfdPMPdp8hYX4VmXQQki8/NJms/ArJkqyg5Ms3CiBYtt/6O1dXE+lb7tPwpHIuh5g==",
+      "version": "1.17.1",
+      "resolved": "https://registry.npmjs.org/es-dev-server/-/es-dev-server-1.17.1.tgz",
+      "integrity": "sha512-EaKF9MQlAV1zRjJKoJ+1LLL3nay8kCHEbVmhnCGeJmRSw/gQoU86rVZltZVii6ocgmLTMdG830iYn4bto2WwEA==",
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-        "@open-wc/building-utils": "^2.5.3",
+        "@open-wc/building-utils": "^2.8.1",
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@@ -2255,6 +2257,7 @@
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         "debounce": "^1.2.0",
         "deepmerge": "^3.3.0",
+        "es-module-lexer": "0.3.9",
         "get-stream": "^5.1.0",
         "is-stream": "^2.0.0",
         "koa": "^2.7.0",
@@ -2263,7 +2266,11 @@
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         "opn": "^5.4.0",
-        "strip-ansi": "^5.2.0"
+        "path-is-inside": "^1.0.2",
+        "portfinder": "^1.0.21",
+        "resolve": "^1.12.0",
+        "strip-ansi": "^5.2.0",
+        "whatwg-url": "^7.0.0"
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       "dependencies": {
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@@ -2319,6 +2326,12 @@
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+    "es-module-lexer": {
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+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-0.3.9.tgz",
+      "integrity": "sha512-beowXiBsaVS208GHoJckwOxlG/RpWLLz2ioJHwkUJ3RGFmW508E5RfntV21bMjzO3hQcwZOTHewUFwnGzrBtIg==",
+      "dev": true
+    },
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@@ -3001,6 +3014,12 @@
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       "dev": true
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+    "he": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
+      "dev": true
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@@ -3020,14 +3039,6 @@
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-          "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
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-          "dev": true
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@@ -3847,9 +3858,9 @@
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-      "resolved": "https://registry.npmjs.org/koa/-/koa-2.7.0.tgz",
-      "integrity": "sha512-7ojD05s2Q+hFudF8tDLZ1CpCdVZw8JQELWSkcfG9bdtoTDzMmkRF6BQBU7JzIzCCOY3xd3tftiy/loHBUYaY2Q==",
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/koa/-/koa-2.8.1.tgz",
+      "integrity": "sha512-iCgjRkntcVud5amnioi+79r7TPVhKPfCY8UzL9GjyU+nIWTE9xsqyrJ6kib3InT9JYRyUu9Y67i5apCjf997TQ==",
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@@ -4879,6 +4890,17 @@
         "pinkie": "^2.0.0"
       }
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+    "portfinder": {
+      "version": "1.0.23",
+      "resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.23.tgz",
+      "integrity": "sha512-B729mL/uLklxtxuiJKfQ84WPxNw5a7Yhx3geQZdcA4GjNjZSTSSMMWyoennMVnTWSmAR0lMdzWYN0JLnHrg1KQ==",
+      "dev": true,
+      "requires": {
+        "async": "^1.5.2",
+        "debug": "^2.2.0",
+        "mkdirp": "0.5.x"
+      }
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     "prelude-ls": {
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       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",