diff --git a/core/field_colour.js b/core/field_colour.js
index 7ff85e5cd..be7990d55 100644
--- a/core/field_colour.js
+++ b/core/field_colour.js
@@ -188,7 +188,7 @@ Blockly.FieldColour.prototype.initView = function() {
 Blockly.FieldColour.prototype.applyColour = function() {
   if (!this.getConstants().FIELD_COLOUR_FULL_BLOCK) {
     if (this.borderRect_) {
-      this.borderRect_.style.fill = this.getValue();
+      this.borderRect_.style.fill = /** @type {string} */ (this.getValue());
     }
   } else {
     this.sourceBlock_.pathObject.svgPath.setAttribute('fill', this.getValue());
@@ -218,7 +218,7 @@ Blockly.FieldColour.prototype.doClassValidation_ = function(opt_newValue) {
 Blockly.FieldColour.prototype.doValueUpdate_ = function(newValue) {
   this.value_ = newValue;
   if (this.borderRect_) {
-    this.borderRect_.style.fill = newValue;
+    this.borderRect_.style.fill = /** @type {string} */ (newValue);
   } else if (this.sourceBlock_ && this.sourceBlock_.rendered) {
     this.sourceBlock_.pathObject.svgPath.setAttribute('fill', newValue);
     this.sourceBlock_.pathObject.svgPath.setAttribute('stroke', '#fff');
diff --git a/package-lock.json b/package-lock.json
index b6bd9fd2a..d990862cf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4006,45 +4006,45 @@
       }
     },
     "google-closure-compiler": {
-      "version": "20210106.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20210106.0.0.tgz",
-      "integrity": "sha512-65HuRilVBBe726iinP9FJ7zLdDdLajDBfW63JD+oohIF+lRv9P/qyqTvQQV9cTFUbUJi8ar4nwe537NIMJkBjA==",
+      "version": "20210202.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20210202.0.0.tgz",
+      "integrity": "sha512-tvwbNFSvVC4c+uNf5MdOAS1xn2S3FN8zb7VtSV7K/TAIttDTYX4t1U1g4YBCbWYrvz6ynrY5SleW1RtG7SIfYQ==",
       "dev": true,
       "requires": {
         "chalk": "2.x",
-        "google-closure-compiler-java": "^20210106.0.0",
-        "google-closure-compiler-linux": "^20210106.0.0",
-        "google-closure-compiler-osx": "^20210106.0.0",
-        "google-closure-compiler-windows": "^20210106.0.0",
+        "google-closure-compiler-java": "^20210202.0.0",
+        "google-closure-compiler-linux": "^20210202.0.0",
+        "google-closure-compiler-osx": "^20210202.0.0",
+        "google-closure-compiler-windows": "^20210202.0.0",
         "minimist": "1.x",
         "vinyl": "2.x",
         "vinyl-sourcemaps-apply": "^0.2.0"
       }
     },
     "google-closure-compiler-java": {
-      "version": "20210106.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler-java/-/google-closure-compiler-java-20210106.0.0.tgz",
-      "integrity": "sha512-RtuvBPpzBMTAizTYoLDXv3hVURi7NVXHa/bn/bf25pryrKOYUNjCCOhPRK8CP9koh/k25pSB/lyAXikFmSq+vg==",
+      "version": "20210202.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-java/-/google-closure-compiler-java-20210202.0.0.tgz",
+      "integrity": "sha512-JSVrwv1k+wEjYgc58s9nXU+P5355l1mVTrmuB4B2cV8UaxFX3e5cRq4kwveBsB2fands2WJ+G74e10xCiEr82A==",
       "dev": true
     },
     "google-closure-compiler-linux": {
-      "version": "20210106.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler-linux/-/google-closure-compiler-linux-20210106.0.0.tgz",
-      "integrity": "sha512-Ae2j6Ob1YDadFCiaZWg7zB2WI/wyOLH/ntEQy/OzljZPvepmO3/WNNYAH9SulCdS/T018/vz+C8nR657fRUlnQ==",
+      "version": "20210202.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-linux/-/google-closure-compiler-linux-20210202.0.0.tgz",
+      "integrity": "sha512-txE9tivnY77TgIxRNiT1nwqW+gjkLBcgy5qy0pE8htIrwuz+cgcTuvwH8mMlLKJJAifd32kboVyc1iymYrdN1w==",
       "dev": true,
       "optional": true
     },
     "google-closure-compiler-osx": {
-      "version": "20210106.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler-osx/-/google-closure-compiler-osx-20210106.0.0.tgz",
-      "integrity": "sha512-e58BcBbCzhpBFJ4f1a9TYPshkTq4cLVeZndRn+o42eLsLp1e2HoqJYudBHrGj6bBLbYwHfQA3hicdC8Nd8cv7w==",
+      "version": "20210202.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-osx/-/google-closure-compiler-osx-20210202.0.0.tgz",
+      "integrity": "sha512-0OP8o4Nj6pR8hIxxQMPY8dO/2n6lWylHfmWv97IFdrxfsT7LKHzDeVt4I59p7nCfuPUoX8HcRNYFAmwKJwlIZQ==",
       "dev": true,
       "optional": true
     },
     "google-closure-compiler-windows": {
-      "version": "20210106.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler-windows/-/google-closure-compiler-windows-20210106.0.0.tgz",
-      "integrity": "sha512-FPgsZR/h4Bg2rQuXF/jGJu2FF0hXWYXGEYk2L2NlC2D1kl+MErrVsXPMJUVnwxpPjenfhahLle1ZMHvNTPDtsQ==",
+      "version": "20210202.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-windows/-/google-closure-compiler-windows-20210202.0.0.tgz",
+      "integrity": "sha512-HoRxdR/STw2cvB5HPS+xfdgNeFF3+2d7ImYyhMGdlv0+u5GxZwGgmLo9QajiI6Ga2ISGyTKUxYe3HWfYDYHrMg==",
       "dev": true,
       "optional": true
     },
@@ -4329,7 +4329,7 @@
         },
         "string_decoder": {
           "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
           "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
           "dev": true
         }
@@ -6818,7 +6818,7 @@
     },
     "path-is-absolute": {
       "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
       "dev": true
     },
@@ -7010,7 +7010,7 @@
     },
     "pretty-hrtime": {
       "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",
+      "resolved": "http://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",
       "integrity": "sha1-t+PqQkNaTJsnWdmeDyAesZWALuE=",
       "dev": true
     },
@@ -7587,7 +7587,7 @@
     },
     "safe-regex": {
       "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
       "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
       "dev": true,
       "requires": {
@@ -8293,7 +8293,7 @@
         },
         "string_decoder": {
           "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
           "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
           "dev": true
         }
@@ -8311,7 +8311,7 @@
     },
     "string_decoder": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
       "dev": true,
       "requires": {
@@ -8535,7 +8535,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
diff --git a/package.json b/package.json
index 230cf793f..b7c71ad33 100644
--- a/package.json
+++ b/package.json
@@ -69,7 +69,7 @@
     "concurrently": "^6.0.0",
     "eslint": "^7.6.0",
     "eslint-plugin-es5": "^1.5.0",
-    "google-closure-compiler": "^20210106.0.0",
+    "google-closure-compiler": "^20210202.0.0",
     "google-closure-deps": "^20210202.0.0",
     "gulp": "^4.0.2",
     "gulp-concat": "^2.6.1",