diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 205a01cae..754aa4c11 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,7 +17,7 @@ jobs:
         # TODO (#2114): re-enable osx build.
         # os: [ubuntu-latest, macos-latest]
         os: [ubuntu-latest]
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [14.x, 16.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
diff --git a/scripts/gulpfiles/build_tasks.js b/scripts/gulpfiles/build_tasks.js
index 8cc1e34c2..810bb425c 100644
--- a/scripts/gulpfiles/build_tasks.js
+++ b/scripts/gulpfiles/build_tasks.js
@@ -42,13 +42,6 @@ const CORE_DIR = path.join(TSC_OUTPUT_DIR, 'core');
  */
 const COMPILED_SUFFIX = '_compressed';
 
-/**
- * Checked-in file to cache output of closure-calculate-chunks, to
- * allow for testing on node.js v12 (or earlier) which is not
- * compatible with closure-calculate-chunks.
- */
-const CHUNK_CACHE_FILE = 'scripts/gulpfiles/chunks.json'
-
 /**
  * Name of an object to be used as a shared "global" namespace by
  * chunks generated by the Closure Compiler with the
@@ -509,29 +502,7 @@ function getChunkOptions() {
   ];
   const cccCommand = `closure-calculate-chunks ${cccArgs.join(' ')}`;
 
-  // Because (as of 2021-11-25) closure-calculate-chunks v3.0.2
-  // requries node.js v14 or later, we save the output of cccCommand
-  // in a checked-in .json file, so we can use the contents of that
-  // file when building on older versions of node.
-  //
-  // When this is no longer necessary the following section can be
-  // replaced with:
-  //
-  // const rawOptions = JSON.parse(execSync(cccCommand));
-  const nodeMajorVersion = /v(\d+)\./.exec(process.version)[1];
-  let rawOptions;
-  if (nodeMajorVersion >= 14) {
-    rawOptions = JSON.parse(String(execSync(cccCommand)));
-    // Replace absolute paths with relative ones, so they will be
-    // valid on other machines.  Only needed because we're saving this
-    // output to use later on another machine.
-    rawOptions.js = rawOptions.js.map(p => p.replace(process.cwd(), '.'));
-    fs.writeFileSync(CHUNK_CACHE_FILE,
-                     JSON.stringify(rawOptions, null, 2) + '\n');
-  } else {
-    console.log(`Warning: using pre-computed chunks from ${CHUNK_CACHE_FILE}`);
-    rawOptions = JSON.parse(String(fs.readFileSync(CHUNK_CACHE_FILE)));
-  }
+  const rawOptions = JSON.parse(execSync(cccCommand));
 
   // rawOptions should now be of the form:
   //