diff --git a/Makefile.js b/Makefile.js
index b93697857c6..3ee1b4c1b4c 100644
--- a/Makefile.js
+++ b/Makefile.js
@@ -43,7 +43,7 @@ const { cat, cd, cp, echo, exec, exit, find, ls, mkdir, pwd, rm, test } = requir
 const PERF_MULTIPLIER = 13e6;
 
 const OPEN_SOURCE_LICENSES = [
-    /MIT/u, /BSD/u, /Apache/u, /ISC/u, /WTF/u, /Public Domain/u, /LGPL/u
+    /MIT/u, /BSD/u, /Apache/u, /ISC/u, /WTF/u, /Public Domain/u, /LGPL/u, /Python/u
 ];
 
 //------------------------------------------------------------------------------
@@ -214,7 +214,7 @@ function generateRuleIndexPage() {
     // `.rules` will be `undefined` if all rules in category are deprecated.
     categoriesData.categories = categoriesData.categories.filter(category => !!category.rules);
 
-    const output = yaml.safeDump(categoriesData, { sortKeys: true });
+    const output = yaml.dump(categoriesData, { sortKeys: true });
 
     output.to(outputFile);
 }
@@ -390,7 +390,7 @@ function getFirstVersionOfDeletion(filePath) {
  * @private
  */
 function lintMarkdown(files) {
-    const config = yaml.safeLoad(fs.readFileSync(path.join(__dirname, "./.markdownlint.yml"), "utf8")),
+    const config = yaml.load(fs.readFileSync(path.join(__dirname, "./.markdownlint.yml"), "utf8")),
         result = markdownlint.sync({
             files,
             config,
diff --git a/lib/cli-engine/formatters/tap.js b/lib/cli-engine/formatters/tap.js
index 354872a0c92..e4148a3b392 100644
--- a/lib/cli-engine/formatters/tap.js
+++ b/lib/cli-engine/formatters/tap.js
@@ -31,7 +31,7 @@ function outputDiagnostics(diagnostic) {
     const prefix = "  ";
     let output = `${prefix}---\n`;
 
-    output += prefix + yaml.safeDump(diagnostic).split("\n").join(`\n${prefix}`);
+    output += prefix + yaml.dump(diagnostic).split("\n").join(`\n${prefix}`);
     output += "...\n";
     return output;
 }
diff --git a/lib/init/config-file.js b/lib/init/config-file.js
index 4c648ac0551..a51f92e1c48 100644
--- a/lib/init/config-file.js
+++ b/lib/init/config-file.js
@@ -63,7 +63,7 @@ function writeYAMLConfigFile(config, filePath) {
     // lazy load YAML to improve performance when not used
     const yaml = require("js-yaml");
 
-    const content = yaml.safeDump(config, { sortKeys: true });
+    const content = yaml.dump(config, { sortKeys: true });
 
     fs.writeFileSync(filePath, content, "utf8");
 }
diff --git a/package.json b/package.json
index f0cd1bf67b0..746d6cc7003 100644
--- a/package.json
+++ b/package.json
@@ -72,7 +72,7 @@
     "import-fresh": "^3.0.0",
     "imurmurhash": "^0.1.4",
     "is-glob": "^4.0.0",
-    "js-yaml": "^3.13.1",
+    "js-yaml": "^4.1.0",
     "json-stable-stringify-without-jsonify": "^1.0.1",
     "levn": "^0.4.1",
     "lodash.merge": "^4.6.2",
diff --git a/tests/lib/init/config-file.js b/tests/lib/init/config-file.js
index e9fe62e2c30..50a9af1d507 100644
--- a/tests/lib/init/config-file.js
+++ b/tests/lib/init/config-file.js
@@ -60,8 +60,8 @@ describe("ConfigFile", () => {
         [
             ["JavaScript", "foo.js", espree.parse],
             ["JSON", "bar.json", JSON.parse],
-            ["YAML", "foo.yaml", yaml.safeLoad],
-            ["YML", "foo.yml", yaml.safeLoad]
+            ["YAML", "foo.yaml", yaml.load],
+            ["YML", "foo.yml", yaml.load]
         ].forEach(([fileType, filename, validate]) => {
 
             it(`should write a file through fs when a ${fileType} path is passed`, () => {