diff --git a/package-lock.json b/package-lock.json
index 5d7647fb..2aeef759 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3274,19 +3274,19 @@
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-      "resolved": "https://registry.npmjs.org/pxt-core/-/pxt-core-3.4.1.tgz",
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+      "resolved": "https://registry.npmjs.org/pxt-core/-/pxt-core-3.4.3.tgz",
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@@ -3315,75 +3315,28 @@
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-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.1.tgz",
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-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
-          "optional": true,
-          "requires": {
-            "ms": "2.0.0"
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         "has-flag": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
-          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE="
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-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.8.0.tgz",
-          "integrity": "sha1-7XFfP+neArV6XmJS2QqWZ14fCFo=",
-          "optional": true
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
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         "postcss": {
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           "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.17.tgz",
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-            "chalk": "2.3.0",
+            "chalk": "2.3.1",
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-            "commander": "2.14.1",
-            "debug": "3.1.0",
-            "nan": "2.8.0",
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-            "promirepl": "1.0.1",
-            "prompt-list": "3.1.2",
-            "safe-buffer": "5.1.1"
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@@ -3392,11 +3345,11 @@
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-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.1.0.tgz",
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+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.2.0.tgz",
+          "integrity": "sha512-F39vS48la4YvTZUPVeTqsjsFNrvcMwrV3RLZINsmHo+7djCvuUzSIeXOnZ5hmjef4bajL1dNccN+tg5XAliO5Q==",
           "requires": {
-            "has-flag": "2.0.0"
+            "has-flag": "3.0.0"
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@@ -3771,6 +3724,45 @@
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       "optional": true
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+    "serialport": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/serialport/-/serialport-6.0.5.tgz",
+      "integrity": "sha512-ZYof3a9m08LTgDU82TFAbjRADIZ1GQTrqXY6JYnCHk8NFv0bEU0qL/MMX8F4wB9oNVbtkaYYeJc6E+gl2bSXpw==",
+      "optional": true,
+      "requires": {
+        "bindings": "1.3.0",
+        "commander": "2.14.1",
+        "debug": "3.1.0",
+        "nan": "2.8.0",
+        "prebuild-install": "2.4.1",
+        "promirepl": "1.0.1",
+        "prompt-list": "3.1.2",
+        "safe-buffer": "5.1.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.14.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.1.tgz",
+          "integrity": "sha512-+YR16o3rK53SmWHU3rEM3tPAh2rwb1yPcQX5irVn7mb0gXbwuCCrnkbV5+PBfETdfg1vui07nM6PCG1zndcjQw==",
+          "optional": true
+        },
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
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+          "optional": true,
+          "requires": {
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+          }
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+        "nan": {
+          "version": "2.8.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.8.0.tgz",
+          "integrity": "sha1-7XFfP+neArV6XmJS2QqWZ14fCFo=",
+          "optional": true
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     "set-blocking": {
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       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
diff --git a/package.json b/package.json
index 973da994..7d0e5b8a 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "webfonts-generator": "^0.4.0"
   },
   "dependencies": {
-    "pxt-common-packages": "0.19.4",
+    "pxt-common-packages": "0.19.5",
     "pxt-core": "3.4.3"
   },
   "scripts": {