diff --git a/CHANGELOG.md b/CHANGELOG.md
index 08da799fc4..1b2aacf7e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+<a name="2.13.4"></a>
+## [2.13.4](https://github.com/jshint/jshint/compare/2.13.3...v2.13.4) (2022-01-24)
+
+### Bug Fixes
+
+* Remove shelljs ([eb4609a](https://github.com/jshint/jshint/commit/eb4609a))
+
 <a name="2.13.3"></a>
 ## [2.13.3](https://github.com/jshint/jshint/compare/2.13.2...v2.13.3) (2022-01-05)
 
diff --git a/dist/jshint-rhino.js b/dist/jshint-rhino.js
index 068e40bcc0..7ff7ff6544 100755
--- a/dist/jshint-rhino.js
+++ b/dist/jshint-rhino.js
@@ -1,6 +1,6 @@
 #!/usr/bin/env rhino
 var window = {};
-/*! 2.13.3 */
+/*! 2.13.4 */
 var JSHINT;
 if (typeof window === 'undefined') window = {};
 (function () {
@@ -1442,14 +1442,15 @@ function isUndefined(arg) {
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.17.20';
+  var VERSION = '4.17.21';
 
   /** Used as the size to enable large array optimizations. */
   var LARGE_ARRAY_SIZE = 200;
 
   /** Error message constants. */
   var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
-      FUNC_ERROR_TEXT = 'Expected a function';
+      FUNC_ERROR_TEXT = 'Expected a function',
+      INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';
 
   /** Used to stand-in for `undefined` hash values. */
   var HASH_UNDEFINED = '__lodash_hash_undefined__';
@@ -1582,10 +1583,11 @@ function isUndefined(arg) {
   var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
       reHasRegExpChar = RegExp(reRegExpChar.source);
 
-  /** Used to match leading and trailing whitespace. */
-  var reTrim = /^\s+|\s+$/g,
-      reTrimStart = /^\s+/,
-      reTrimEnd = /\s+$/;
+  /** Used to match leading whitespace. */
+  var reTrimStart = /^\s+/;
+
+  /** Used to match a single whitespace character. */
+  var reWhitespace = /\s/;
 
   /** Used to match wrap detail comments. */
   var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
@@ -1595,6 +1597,18 @@ function isUndefined(arg) {
   /** Used to match words composed of alphanumeric characters. */
   var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
 
+  /**
+   * Used to validate the `validate` option in `_.template` variable.
+   *
+   * Forbids characters which could potentially change the meaning of the function argument definition:
+   * - "()," (modification of function parameters)
+   * - "=" (default value)
+   * - "[]{}" (destructuring of function parameters)
+   * - "/" (beginning of a comment)
+   * - whitespace
+   */
+  var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/;
+
   /** Used to match backslashes in property paths. */
   var reEscapeChar = /\\(\\)?/g;
 
@@ -2423,6 +2437,19 @@ function isUndefined(arg) {
     });
   }
 
+  /**
+   * The base implementation of `_.trim`.
+   *
+   * @private
+   * @param {string} string The string to trim.
+   * @returns {string} Returns the trimmed string.
+   */
+  function baseTrim(string) {
+    return string
+      ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')
+      : string;
+  }
+
   /**
    * The base implementation of `_.unary` without support for storing metadata.
    *
@@ -2756,6 +2783,21 @@ function isUndefined(arg) {
       : asciiToArray(string);
   }
 
+  /**
+   * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
+   * character of `string`.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the index of the last non-whitespace character.
+   */
+  function trimmedEndIndex(string) {
+    var index = string.length;
+
+    while (index-- && reWhitespace.test(string.charAt(index))) {}
+    return index;
+  }
+
   /**
    * Used by `_.unescape` to convert HTML entities to characters.
    *
@@ -13924,7 +13966,7 @@ function isUndefined(arg) {
       if (typeof value != 'string') {
         return value === 0 ? value : +value;
       }
-      value = value.replace(reTrim, '');
+      value = baseTrim(value);
       var isBinary = reIsBinary.test(value);
       return (isBinary || reIsOctal.test(value))
         ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
@@ -16296,6 +16338,12 @@ function isUndefined(arg) {
       if (!variable) {
         source = 'with (obj) {\n' + source + '\n}\n';
       }
+      // Throw an error if a forbidden character was found in `variable`, to prevent
+      // potential command injection attacks.
+      else if (reForbiddenIdentifierChars.test(variable)) {
+        throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT);
+      }
+
       // Cleanup code by stripping empty strings.
       source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
         .replace(reEmptyStringMiddle, '$1')
@@ -16409,7 +16457,7 @@ function isUndefined(arg) {
     function trim(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrim, '');
+        return baseTrim(string);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
@@ -16444,7 +16492,7 @@ function isUndefined(arg) {
     function trimEnd(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrimEnd, '');
+        return string.slice(0, trimmedEndIndex(string) + 1);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
diff --git a/dist/jshint.js b/dist/jshint.js
index d0cf46993f..13bc2fe3e5 100644
--- a/dist/jshint.js
+++ b/dist/jshint.js
@@ -1,4 +1,4 @@
-/*! 2.13.3 */
+/*! 2.13.4 */
 var JSHINT;
 if (typeof window === 'undefined') window = {};
 (function () {
@@ -1440,14 +1440,15 @@ function isUndefined(arg) {
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.17.20';
+  var VERSION = '4.17.21';
 
   /** Used as the size to enable large array optimizations. */
   var LARGE_ARRAY_SIZE = 200;
 
   /** Error message constants. */
   var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
-      FUNC_ERROR_TEXT = 'Expected a function';
+      FUNC_ERROR_TEXT = 'Expected a function',
+      INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';
 
   /** Used to stand-in for `undefined` hash values. */
   var HASH_UNDEFINED = '__lodash_hash_undefined__';
@@ -1580,10 +1581,11 @@ function isUndefined(arg) {
   var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
       reHasRegExpChar = RegExp(reRegExpChar.source);
 
-  /** Used to match leading and trailing whitespace. */
-  var reTrim = /^\s+|\s+$/g,
-      reTrimStart = /^\s+/,
-      reTrimEnd = /\s+$/;
+  /** Used to match leading whitespace. */
+  var reTrimStart = /^\s+/;
+
+  /** Used to match a single whitespace character. */
+  var reWhitespace = /\s/;
 
   /** Used to match wrap detail comments. */
   var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
@@ -1593,6 +1595,18 @@ function isUndefined(arg) {
   /** Used to match words composed of alphanumeric characters. */
   var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
 
+  /**
+   * Used to validate the `validate` option in `_.template` variable.
+   *
+   * Forbids characters which could potentially change the meaning of the function argument definition:
+   * - "()," (modification of function parameters)
+   * - "=" (default value)
+   * - "[]{}" (destructuring of function parameters)
+   * - "/" (beginning of a comment)
+   * - whitespace
+   */
+  var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/;
+
   /** Used to match backslashes in property paths. */
   var reEscapeChar = /\\(\\)?/g;
 
@@ -2421,6 +2435,19 @@ function isUndefined(arg) {
     });
   }
 
+  /**
+   * The base implementation of `_.trim`.
+   *
+   * @private
+   * @param {string} string The string to trim.
+   * @returns {string} Returns the trimmed string.
+   */
+  function baseTrim(string) {
+    return string
+      ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')
+      : string;
+  }
+
   /**
    * The base implementation of `_.unary` without support for storing metadata.
    *
@@ -2754,6 +2781,21 @@ function isUndefined(arg) {
       : asciiToArray(string);
   }
 
+  /**
+   * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
+   * character of `string`.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the index of the last non-whitespace character.
+   */
+  function trimmedEndIndex(string) {
+    var index = string.length;
+
+    while (index-- && reWhitespace.test(string.charAt(index))) {}
+    return index;
+  }
+
   /**
    * Used by `_.unescape` to convert HTML entities to characters.
    *
@@ -13922,7 +13964,7 @@ function isUndefined(arg) {
       if (typeof value != 'string') {
         return value === 0 ? value : +value;
       }
-      value = value.replace(reTrim, '');
+      value = baseTrim(value);
       var isBinary = reIsBinary.test(value);
       return (isBinary || reIsOctal.test(value))
         ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
@@ -16294,6 +16336,12 @@ function isUndefined(arg) {
       if (!variable) {
         source = 'with (obj) {\n' + source + '\n}\n';
       }
+      // Throw an error if a forbidden character was found in `variable`, to prevent
+      // potential command injection attacks.
+      else if (reForbiddenIdentifierChars.test(variable)) {
+        throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT);
+      }
+
       // Cleanup code by stripping empty strings.
       source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
         .replace(reEmptyStringMiddle, '$1')
@@ -16407,7 +16455,7 @@ function isUndefined(arg) {
     function trim(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrim, '');
+        return baseTrim(string);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
@@ -16442,7 +16490,7 @@ function isUndefined(arg) {
     function trimEnd(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrimEnd, '');
+        return string.slice(0, trimmedEndIndex(string) + 1);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
diff --git a/package-lock.json b/package-lock.json
index dc2ddde935..59796046e2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "jshint",
-  "version": "2.13.3",
+  "version": "2.13.4",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "jshint",
-      "version": "2.13.3",
+      "version": "2.13.4",
       "license": "MIT",
       "dependencies": {
         "cli": "~1.0.0",
diff --git a/package.json b/package.json
index cd7033c0d3..bde37c08db 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jshint",
-  "version": "2.13.3",
+  "version": "2.13.4",
   "homepage": "http://jshint.com/",
   "description": "Static analysis tool for JavaScript",
   "author": {