diff --git a/microsite/package.json b/microsite/package.json
index e1860b8314..975bec3149 100644
--- a/microsite/package.json
+++ b/microsite/package.json
@@ -16,7 +16,7 @@
   "devDependencies": {
     "@spotify/prettier-config": "^9.0.0",
     "docusaurus": "^2.0.0-alpha.378053ac5",
-    "js-yaml": "^3.14.1",
+    "js-yaml": "^4.0.0",
     "prettier": "^2.2.1"
   },
   "prettier": "@spotify/prettier-config"
diff --git a/microsite/pages/en/plugins.js b/microsite/pages/en/plugins.js
index b1854135dc..c7a626bd1d 100644
--- a/microsite/pages/en/plugins.js
+++ b/microsite/pages/en/plugins.js
@@ -16,7 +16,7 @@ const {
 const pluginsDirectory = require('path').join(process.cwd(), 'data/plugins');
 const pluginMetadata = fs
   .readdirSync(pluginsDirectory)
-  .map(file => yaml.safeLoad(fs.readFileSync(`./data/plugins/${file}`, 'utf8')))
+  .map(file => yaml.load(fs.readFileSync(`./data/plugins/${file}`, 'utf8')))
   .sort((a, b) => a.title.toLowerCase().localeCompare(b.title.toLowerCase()));
 const truncate = text =>
   text.length > 170 ? text.substr(0, 170) + '...' : text;
diff --git a/microsite/yarn.lock b/microsite/yarn.lock
index e41db2a665..356585cf3e 100644
--- a/microsite/yarn.lock
+++ b/microsite/yarn.lock
@@ -1124,6 +1124,11 @@ argparse@^1.0.10, argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+argparse@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/argparse/-/argparse-2.0.1.tgz#246f50f3ca78a3240f6c997e8a9bd1eac49e4b38"
+  integrity sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==
+
 arr-diff@^4.0.0:
   version "4.0.0"
   resolved "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz#d6461074febfec71e7e15235761a329a5dc7c520"
@@ -3921,7 +3926,7 @@ js-tokens@^3.0.2:
   resolved "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
   integrity sha1-mGbfOVECEw449/mWvOtlRDIJwls=
 
-js-yaml@^3.13.1, js-yaml@^3.14.1, js-yaml@^3.8.1:
+js-yaml@^3.13.1, js-yaml@^3.8.1:
   version "3.14.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.14.1.tgz#dae812fdb3825fa306609a8717383c50c36a0537"
   integrity sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==
@@ -3929,6 +3934,13 @@ js-yaml@^3.13.1, js-yaml@^3.14.1, js-yaml@^3.8.1:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
+js-yaml@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.0.0.tgz#f426bc0ff4b4051926cd588c71113183409a121f"
+  integrity sha512-pqon0s+4ScYUvX30wxQi3PogGFAlUyH0awepWvwkj4jD4v+ova3RiYw8bmA6x2rDrEaj8i/oWKoRxpVNW+Re8Q==
+  dependencies:
+    argparse "^2.0.1"
+
 jsbn@~0.1.0:
   version "0.1.1"
   resolved "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
diff --git a/packages/techdocs-common/package.json b/packages/techdocs-common/package.json
index 7fc88a5238..fd20475352 100644
--- a/packages/techdocs-common/package.json
+++ b/packages/techdocs-common/package.json
@@ -48,7 +48,7 @@
     "express": "^4.17.1",
     "fs-extra": "^9.0.1",
     "git-url-parse": "^11.4.3",
-    "js-yaml": "^3.14.0",
+    "js-yaml": "^4.0.0",
     "mime-types": "^2.1.27",
     "mock-fs": "^4.13.0",
     "recursive-readdir": "^2.2.2",
diff --git a/packages/techdocs-common/src/stages/generate/helpers.test.ts b/packages/techdocs-common/src/stages/generate/helpers.test.ts
index 83ccbbffab..48a48986f2 100644
--- a/packages/techdocs-common/src/stages/generate/helpers.test.ts
+++ b/packages/techdocs-common/src/stages/generate/helpers.test.ts
@@ -303,7 +303,7 @@ describe('helpers', () => {
       const updatedMkdocsYml = await fs.readFile('/mkdocs.yml');
 
       expect(updatedMkdocsYml.toString()).toContain(
-        "repo_url: 'https://github.com/backstage/backstage'",
+        'repo_url: https://github.com/backstage/backstage',
       );
     });
 
@@ -322,10 +322,10 @@ describe('helpers', () => {
       const updatedMkdocsYml = await fs.readFile('/mkdocs_with_repo_url.yml');
 
       expect(updatedMkdocsYml.toString()).toContain(
-        "repo_url: 'https://github.com/backstage/backstage'",
+        'repo_url: https://github.com/backstage/backstage',
       );
       expect(updatedMkdocsYml.toString()).not.toContain(
-        "repo_url: 'https://github.com/neworg/newrepo'",
+        'repo_url: https://github.com/neworg/newrepo',
       );
     });
   });
diff --git a/packages/techdocs-common/src/stages/generate/helpers.ts b/packages/techdocs-common/src/stages/generate/helpers.ts
index 773b542517..16f5b26632 100644
--- a/packages/techdocs-common/src/stages/generate/helpers.ts
+++ b/packages/techdocs-common/src/stages/generate/helpers.ts
@@ -241,7 +241,7 @@ export const patchMkdocsYmlPreBuild = async (
 
   let mkdocsYml: any;
   try {
-    mkdocsYml = yaml.safeLoad(mkdocsYmlFileString);
+    mkdocsYml = yaml.load(mkdocsYmlFileString);
 
     // mkdocsYml should be an object type after successful parsing.
     // But based on its type definition, it can also be a string or undefined, which we don't want.
@@ -267,7 +267,7 @@ export const patchMkdocsYmlPreBuild = async (
   }
 
   try {
-    await fs.writeFile(mkdocsYmlPath, yaml.safeDump(mkdocsYml), 'utf8');
+    await fs.writeFile(mkdocsYmlPath, yaml.dump(mkdocsYml), 'utf8');
   } catch (error) {
     logger.warn(
       `Could not write to ${mkdocsYmlPath} after updating it before running the generator. ${error.message}`,
diff --git a/yarn.lock b/yarn.lock
index bbe8dc1ebb..46fcca5f4d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7399,6 +7399,11 @@ argparse@^1.0.10, argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+argparse@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz#246f50f3ca78a3240f6c997e8a9bd1eac49e4b38"
+  integrity sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==
+
 aria-query@^3.0.0:
   version "3.0.0"
   resolved "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz#65b3fcc1ca1155a8c9ae64d6eee297f15d5133cc"
@@ -15739,6 +15744,13 @@ js-yaml@^3.13.0, js-yaml@^3.13.1, js-yaml@^3.14.0, js-yaml@^3.6.1, js-yaml@^3.8.
     argparse "^1.0.7"
     esprima "^4.0.0"
 
+js-yaml@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.npmjs.org/js-yaml/-/js-yaml-4.0.0.tgz#f426bc0ff4b4051926cd588c71113183409a121f"
+  integrity sha512-pqon0s+4ScYUvX30wxQi3PogGFAlUyH0awepWvwkj4jD4v+ova3RiYw8bmA6x2rDrEaj8i/oWKoRxpVNW+Re8Q==
+  dependencies:
+    argparse "^2.0.1"
+
 jsbn@~0.1.0:
   version "0.1.1"
   resolved "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"