diff --git a/build/Dockerfile b/build/Dockerfile
index 0b87626dd0b..6071f72d3b1 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12
+FROM node:14
 
 ARG DEBIAN_FRONTEND=noninteractive
 
diff --git a/package.json b/package.json
index 636c31457a7..7174ef53158 100644
--- a/package.json
+++ b/package.json
@@ -1148,7 +1148,7 @@
     "@types/glob": "7.2.0",
     "@types/lodash": "4.14.175",
     "@types/mocha": "9.0.0",
-    "@types/node": "12.20.33",
+    "@types/node": "14.17.27",
     "@types/parsimmon": "1.10.6",
     "@types/sinon": "10.0.4",
     "@types/source-map-support": "0.5.4",
diff --git a/src/platform/browser/fs.ts b/src/platform/browser/fs.ts
index eb8fd94d679..a052570caa4 100644
--- a/src/platform/browser/fs.ts
+++ b/src/platform/browser/fs.ts
@@ -80,7 +80,7 @@ export async function unlink(path: string): Promise<void> {
   await vscode.workspace.fs.delete(vscode.Uri.parse(path));
 }
 
-export async function readFileAsync(path: string, encoding: string): Promise<string> {
+export async function readFileAsync(path: string, encoding: BufferEncoding): Promise<string> {
   const ret = await vscode.workspace.fs.readFile(vscode.Uri.parse(path));
   return ret.toString();
 }
@@ -92,7 +92,7 @@ export async function mkdirAsync(path: string, options: any): Promise<void> {
 export async function writeFileAsync(
   path: string,
   content: string,
-  encoding: string
+  encoding: BufferEncoding
 ): Promise<void> {
   return vscode.workspace.fs.writeFile(vscode.Uri.parse(path), Buffer.from(content));
 }
diff --git a/src/platform/node/fs.ts b/src/platform/node/fs.ts
index 2c2e25249de..31216ac53a5 100644
--- a/src/platform/node/fs.ts
+++ b/src/platform/node/fs.ts
@@ -90,20 +90,20 @@ export async function unlink(path: string): Promise<void> {
   fs.unlinkSync(path);
 }
 
-export async function readFileAsync(path: string, encoding: string): Promise<string> {
+export async function readFileAsync(path: string, encoding: BufferEncoding): Promise<string> {
   return promisify(fs.readFile)(path, encoding);
 }
 
 export async function mkdirAsync(path: string, options: any): Promise<void> {
-  return promisify(fs.mkdir)(path, options);
+  await promisify(fs.mkdir)(path, options);
 }
 
 export async function writeFileAsync(
   path: string,
   content: string,
-  encoding: string
+  encoding: BufferEncoding
 ): Promise<void> {
-  return promisify(fs.writeFile)(path, content, encoding);
+  await promisify(fs.writeFile)(path, content, encoding);
 }
 
 export async function accessAsync(path: string, mode: number) {
diff --git a/yarn.lock b/yarn.lock
index 696658cdf01..c64d3a23ab8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3,7 +3,7 @@
 
 
 "@babel/code-frame@^7.0.0":
-  version "7.10.7"
+  version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.10.4.tgz#168da1a36e90da68ae8d49c0f1b48c7c6249213a"
   integrity sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==
   dependencies:
@@ -233,10 +233,10 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.11.2.tgz#2de1ed6670439387da1c9f549a2ade2b0a799256"
   integrity sha512-jiE3QIxJ8JLNcb1Ps6rDbysDhN4xa8DJJvuC9prr6w+1tIh+QAbYyNF3tyiZNLDBIuBCf4KEcV2UvQm/V60xfA==
 
-"@types/node@12.20.33":
-  version "12.20.33"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.20.33.tgz#24927446e8b7669d10abacedd16077359678f436"
-  integrity sha512-5XmYX2GECSa+CxMYaFsr2mrql71Q4EvHjKS+ox/SiwSdaASMoBIWE6UmZqFO+VX1jIcsYLStI4FFoB6V7FeIYw==
+"@types/node@14.17.27":
+  version "14.17.27"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.17.27.tgz#5054610d37bb5f6e21342d0e6d24c494231f3b85"
+  integrity sha512-94+Ahf9IcaDuJTle/2b+wzvjmutxXAEXU6O81JHblYXUg2BDG+dnBy7VxIPHKAyEEDHzCMQydTJuWvrE+Aanzw==
 
 "@types/parse-json@^4.0.0":
   version "4.0.0"