diff --git a/lit-html/package-lock.json b/lit-html/package-lock.json
index 0f70c7c..f69fec5 100644
--- a/lit-html/package-lock.json
+++ b/lit-html/package-lock.json
@@ -479,6 +479,7 @@
       "resolved": "http://35.185.235.147/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
         "kind-of": "3.2.2",
         "longest": "1.0.1",
@@ -2534,36 +2535,36 @@
       "integrity": "sha512-STB7LZ4N0L+81FJHGla2oboUHTk4PaN1RsOkoRh9OSeEKylvF5hwKYVX1xCLFaCT7MD0BNG/gX2WFMLqY6EMBw==",
       "dev": true,
       "requires": {
-        "accepts": "1.3.4",
+        "accepts": "~1.3.4",
         "array-flatten": "1.1.1",
         "body-parser": "1.18.2",
         "content-disposition": "0.5.2",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "cookie": "0.3.1",
         "cookie-signature": "1.0.6",
         "debug": "2.6.9",
-        "depd": "1.1.1",
-        "encodeurl": "1.0.1",
-        "escape-html": "1.0.3",
-        "etag": "1.8.1",
+        "depd": "~1.1.1",
+        "encodeurl": "~1.0.1",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
         "finalhandler": "1.1.0",
         "fresh": "0.5.2",
         "merge-descriptors": "1.0.1",
-        "methods": "1.1.2",
-        "on-finished": "2.3.0",
-        "parseurl": "1.3.2",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.2",
         "path-to-regexp": "0.1.7",
-        "proxy-addr": "2.0.2",
+        "proxy-addr": "~2.0.2",
         "qs": "6.5.1",
-        "range-parser": "1.2.0",
+        "range-parser": "~1.2.0",
         "safe-buffer": "5.1.1",
         "send": "0.16.1",
         "serve-static": "1.13.1",
         "setprototypeof": "1.1.0",
-        "statuses": "1.3.1",
-        "type-is": "1.6.15",
+        "statuses": "~1.3.1",
+        "type-is": "~1.6.15",
         "utils-merge": "1.0.1",
-        "vary": "1.1.2"
+        "vary": "~1.1.2"
       },
       "dependencies": {
         "debug": {
@@ -2578,7 +2579,7 @@
         "ms": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+          "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
           "dev": true
         },
         "send": {
@@ -2588,18 +2589,18 @@
           "dev": true,
           "requires": {
             "debug": "2.6.9",
-            "depd": "1.1.1",
-            "destroy": "1.0.4",
-            "encodeurl": "1.0.1",
-            "escape-html": "1.0.3",
-            "etag": "1.8.1",
+            "depd": "~1.1.1",
+            "destroy": "~1.0.4",
+            "encodeurl": "~1.0.1",
+            "escape-html": "~1.0.3",
+            "etag": "~1.8.1",
             "fresh": "0.5.2",
-            "http-errors": "1.6.2",
+            "http-errors": "~1.6.2",
             "mime": "1.4.1",
             "ms": "2.0.0",
-            "on-finished": "2.3.0",
-            "range-parser": "1.2.0",
-            "statuses": "1.3.1"
+            "on-finished": "~2.3.0",
+            "range-parser": "~1.2.0",
+            "statuses": "~1.3.1"
           }
         },
         "setprototypeof": {
@@ -4058,7 +4059,8 @@
       "version": "1.0.1",
       "resolved": "http://35.185.235.147/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "loose-envify": {
       "version": "1.3.1",
@@ -5612,7 +5614,8 @@
           "version": "4.17.4",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
           "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },