diff --git a/package.json b/package.json
index 80090ebfe..7c9286324 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "@types/lodash.memoize": "^4.1.3",
     "@types/micromatch": "^3.1.0",
     "@types/nock": "^10.0.3",
-    "@types/node": "^10.11.3",
+    "@types/node": "^14",
     "@types/node-fetch": "^2.5.12",
     "@types/p-limit": "^2.0.0",
     "@types/prettier": "^1.16.1",
diff --git a/source/api/_tests/fetch.test.ts b/source/api/_tests/fetch.test.ts
index a28d735b6..e52bc0338 100644
--- a/source/api/_tests/fetch.test.ts
+++ b/source/api/_tests/fetch.test.ts
@@ -27,8 +27,8 @@ class TestServer {
 
   start = async (response: ResponseMock): Promise<void> => {
     this.response = response
-    return new Promise<void>((resolve, reject) => {
-      this.server.listen(this.port, this.hostname, (err: any) => (err ? reject(err) : resolve()))
+    return new Promise<void>(() => {
+      this.server.listen(this.port, this.hostname)
     })
   }
   stop = async (): Promise<void> => {
@@ -50,9 +50,9 @@ class TestProxy {
   private server = http.createServer(this.router)
 
   start = async (): Promise<void> => {
-    return new Promise<void>((resolve, reject) => {
+    return new Promise<void>(() => {
       this.isRunning = true
-      this.server.listen(this.port, this.hostname, (err: any) => (err ? reject(err) : resolve()))
+      this.server.listen(this.port, this.hostname)
     })
   }
   stop = async (): Promise<void> => {
diff --git a/source/platforms/github/GitHubUtils.ts b/source/platforms/github/GitHubUtils.ts
index 72a9a3dad..7ba38992a 100644
--- a/source/platforms/github/GitHubUtils.ts
+++ b/source/platforms/github/GitHubUtils.ts
@@ -89,7 +89,10 @@ export const fileContentsGenerator = (
       return ""
     }
     if (isFileContents(response.data) && response.data.content) {
-      const buffer = Buffer.from(response.data.content, response.data.encoding)
+      if (response.data.encoding !== "bsae64") {
+        throw new Error(`Unsupported encoding: ${response.data.encoding}`);
+      }
+      const buffer = Buffer.from(response.data.content, "base64")
       return buffer.toString()
     } else {
       return ""
diff --git a/yarn.lock b/yarn.lock
index d35c48ba0..d928b995a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1232,10 +1232,10 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-13.7.0.tgz#b417deda18cf8400f278733499ad5547ed1abec4"
   integrity sha512-GnZbirvmqZUzMgkFn70c74OQpTTUcCzlhQliTzYjQMqg+hVKcDnxdL19Ne3UdYzdMA/+W3eb646FWn/ZaT1NfQ==
 
-"@types/node@^10.11.3":
-  version "10.17.55"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.17.55.tgz#a147f282edec679b894d4694edb5abeb595fecbd"
-  integrity sha512-koZJ89uLZufDvToeWO5BrC4CR4OUfHnUz2qoPs/daQH6qq3IN62QFxCTZ+bKaCE0xaoCAJYE4AXre8AbghCrhg==
+"@types/node@^14":
+  version "14.18.12"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.18.12.tgz#0d4557fd3b94497d793efd4e7d92df2f83b4ef24"
+  integrity sha512-q4jlIR71hUpWTnGhXWcakgkZeHa3CCjcQcnuzU8M891BAWA2jHiziiWEPEkdS5pFsz7H9HJiy8BrK7tBRNrY7A==
 
 "@types/p-limit@^2.0.0":
   version "2.0.0"