diff --git a/package-lock.json b/package-lock.json
index 32c6f7ebf60fed9479086ed617b06f50faa5e7d8..43b6a1daad5403e09d3ba67cb1962f2fa44b2b14 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2616,12 +2616,12 @@
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-      "version": "74.0.0",
-      "resolved": "https://registry.npmjs.org/chromedriver/-/chromedriver-74.0.0.tgz",
-      "integrity": "sha512-xXgsq0l4gVTY9X5vuccOSVj/iEBm3Bf5MIwzSAASIRJagt4BlWw77SxQq1f4JAJ35/9Ys4NLMA/kWFbd7A/gfQ==",
+      "version": "75.1.0",
+      "resolved": "https://registry.npmjs.org/chromedriver/-/chromedriver-75.1.0.tgz",
+      "integrity": "sha512-N2P0fg6FS4c+tTG0R7cCOD5qiVo+E6uAz6xVjmbZesYv1xs1iGdcCUo0IqOY+ppD/4OOObG+XWV1CFWXT6UIgA==",
       "dev": true,
       "requires": {
-        "del": "^3.0.0",
+        "del": "^4.1.1",
         "extract-zip": "^1.6.7",
         "mkdirp": "^0.5.1",
         "request": "^2.88.0",
@@ -3543,25 +3543,18 @@
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     "del": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/del/-/del-3.0.0.tgz",
-      "integrity": "sha1-U+z2mf/LyzljdpGrE7rxYIGXZuU=",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/del/-/del-4.1.1.tgz",
+      "integrity": "sha512-QwGuEUouP2kVwQenAsOof5Fv8K9t3D8Ca8NxcXKrIpEHjTXK5J2nXLdP+ALI1cgv8wj7KuwBhTwBkOZSJKM5XQ==",
       "dev": true,
       "requires": {
+        "@types/glob": "^7.1.1",
         "globby": "^6.1.0",
-        "is-path-cwd": "^1.0.0",
-        "is-path-in-cwd": "^1.0.0",
-        "p-map": "^1.1.1",
-        "pify": "^3.0.0",
-        "rimraf": "^2.2.8"
-      },
-      "dependencies": {
-        "pify": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
-          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
-          "dev": true
-        }
+        "is-path-cwd": "^2.0.0",
+        "is-path-in-cwd": "^2.0.0",
+        "p-map": "^2.0.0",
+        "pify": "^4.0.1",
+        "rimraf": "^2.6.3"
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@@ -7006,27 +6999,27 @@
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-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-1.0.0.tgz",
-      "integrity": "sha1-0iXsIxMuie3Tj9p2dHLmLmXxEG0=",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.2.0.tgz",
+      "integrity": "sha512-w942bTcih8fdJPJmQHFzkS76NEP8Kzzvmw92cXsazb8intwLqPibPPdXf4ANdKV3rYMuuQYGIWtvz9JilB3NFQ==",
       "dev": true
     },
     "is-path-in-cwd": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-1.0.1.tgz",
-      "integrity": "sha512-FjV1RTW48E7CWM7eE/J2NJvAEEVektecDBVBE5Hh3nM1Jd0kvhHtX68Pr3xsDf857xt3Y4AkwVULK1Vku62aaQ==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-2.1.0.tgz",
+      "integrity": "sha512-rNocXHgipO+rvnP6dk3zI20RpOtrAM/kzbB258Uw5BWr3TpXi861yzjo16Dn4hUox07iw5AyeMLHWsujkjzvRQ==",
       "dev": true,
       "requires": {
-        "is-path-inside": "^1.0.0"
+        "is-path-inside": "^2.1.0"
       }
     },
     "is-path-inside": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/is-path-inside/-/is-path-inside-1.0.1.tgz",
-      "integrity": "sha1-jvW33lBDej/cprToZe96pVy0gDY=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-path-inside/-/is-path-inside-2.1.0.tgz",
+      "integrity": "sha512-wiyhTzfDWsvwAW53OBWF5zuvaOGlZ6PwYxAbPVDhpm+gM09xKQGjBq/8uYN12aDvMxnAnq3dxTyoSoRNmg5YFg==",
       "dev": true,
       "requires": {
-        "path-is-inside": "^1.0.1"
+        "path-is-inside": "^1.0.2"
       }
     },
     "is-plain-obj": {
@@ -9555,9 +9548,9 @@
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     "p-map": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/p-map/-/p-map-1.2.0.tgz",
-      "integrity": "sha512-r6zKACMNhjPJMTl8KcFH4li//gkrXWfbD6feV8l6doRHlzljFWGJ2AP6iKaCJXyZmAUMOPtvbW7EXkbWO/pLEA==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/p-map/-/p-map-2.1.0.tgz",
+      "integrity": "sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==",
       "dev": true
     },
     "p-retry": {
@@ -11235,9 +11228,9 @@
       }
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     "scratch-blocks": {
-      "version": "0.1.0-prerelease.1563990552",
-      "resolved": "https://registry.npmjs.org/scratch-blocks/-/scratch-blocks-0.1.0-prerelease.1563990552.tgz",
-      "integrity": "sha512-7V6PuufNXdJajpn1bIrB+MABN6bggdAJy5ejhaGFuw4TaUPS7khRWuFGx569Iljt03C+2lzRPIK66cUQ1NpdPg==",
+      "version": "0.1.0-prerelease.1564581595",
+      "resolved": "https://registry.npmjs.org/scratch-blocks/-/scratch-blocks-0.1.0-prerelease.1564581595.tgz",
+      "integrity": "sha512-ixktjoum1irVuZ+W31wZCdm4IbTbe4/hY+aQqnfznGivaclDWF5dzdClT3ec+x23/bDupBvIjH6+zmIJWbS/Gg==",
       "dev": true,
       "requires": {
         "exports-loader": "0.6.3",
diff --git a/package.json b/package.json
index 28df3b4d5bc59fa818f62bbbfe04bc84d113c299..697ff795443c2b4e7f42bdac8d8ee66415bc01a3 100644
--- a/package.json
+++ b/package.json
@@ -106,7 +106,7 @@
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20190114210212",
     "scratch-l10n": "3.5.20190724160319",
-    "scratch-blocks": "0.1.0-prerelease.1563990552",
+    "scratch-blocks": "0.1.0-prerelease.1564581595",
     "scratch-paint": "0.2.0-prerelease.20190729153946",
     "scratch-render": "0.1.0-prerelease.20190605151415",
     "scratch-storage": "1.3.2",