diff --git a/@commitlint/cz-commitlint/src/utils/case-fn.ts b/@commitlint/cz-commitlint/src/utils/case-fn.ts
index f51b39c7be..1f4c50f284 100644
--- a/@commitlint/cz-commitlint/src/utils/case-fn.ts
+++ b/@commitlint/cz-commitlint/src/utils/case-fn.ts
@@ -1,12 +1,6 @@
-import _ from 'lodash';
-import camelCase from 'lodash/camelCase';
-import kebabCase from 'lodash/kebabCase';
-import snakeCase from 'lodash/snakeCase';
-import startCase from 'lodash/startCase';
-import upperFirst from 'lodash/upperFirst';
 import {ruleIsActive, ruleIsNotApplicable} from './rules';
 import {TargetCaseType} from '@commitlint/types';
-import {case as ensureCase} from '@commitlint/ensure';
+import {case as ensureCase, toCase} from '@commitlint/ensure';
 import {Rule} from '../types';
 
 export type CaseFn = (input: string | string[], delimiter?: string) => string;
@@ -47,30 +41,3 @@ export default function getCaseFn(rule?: Rule): CaseFn {
 			.join(delimiter);
 	};
 }
-
-function toCase(input: string, target: TargetCaseType): string {
-	switch (target) {
-		case 'camel-case':
-			return camelCase(input);
-		case 'kebab-case':
-			return kebabCase(input);
-		case 'snake-case':
-			return snakeCase(input);
-		case 'pascal-case':
-			return upperFirst(camelCase(input));
-		case 'start-case':
-			return startCase(input);
-		case 'upper-case':
-		case 'uppercase':
-			return input.toUpperCase();
-		case 'sentence-case':
-		case 'sentencecase':
-			return input.charAt(0).toUpperCase() + input.slice(1);
-		case 'lower-case':
-		case 'lowercase':
-		case 'lowerCase': // Backwards compat config-angular v4
-			return input.toLowerCase();
-		default:
-			throw new TypeError(`Unknown target case "${target}"`);
-	}
-}
diff --git a/@commitlint/ensure/src/case.ts b/@commitlint/ensure/src/case.ts
index 13701efde5..fcd8b35827 100644
--- a/@commitlint/ensure/src/case.ts
+++ b/@commitlint/ensure/src/case.ts
@@ -1,8 +1,4 @@
-import camelCase from 'lodash/camelCase';
-import kebabCase from 'lodash/kebabCase';
-import snakeCase from 'lodash/snakeCase';
-import upperFirst from 'lodash/upperFirst';
-import startCase from 'lodash/startCase';
+import toCase from './to-case';
 import {TargetCaseType} from '@commitlint/types';
 
 export default ensureCase;
@@ -25,30 +21,3 @@ function ensureCase(
 
 	return transformed === input;
 }
-
-function toCase(input: string, target: TargetCaseType): string {
-	switch (target) {
-		case 'camel-case':
-			return camelCase(input);
-		case 'kebab-case':
-			return kebabCase(input);
-		case 'snake-case':
-			return snakeCase(input);
-		case 'pascal-case':
-			return upperFirst(camelCase(input));
-		case 'start-case':
-			return startCase(input);
-		case 'upper-case':
-		case 'uppercase':
-			return input.toUpperCase();
-		case 'sentence-case':
-		case 'sentencecase':
-			return input.charAt(0).toUpperCase() + input.slice(1);
-		case 'lower-case':
-		case 'lowercase':
-		case 'lowerCase': // Backwards compat config-angular v4
-			return input.toLowerCase();
-		default:
-			throw new TypeError(`ensure-case: Unknown target case "${target}"`);
-	}
-}
diff --git a/@commitlint/ensure/src/index.ts b/@commitlint/ensure/src/index.ts
index 982e128525..379e60beb1 100644
--- a/@commitlint/ensure/src/index.ts
+++ b/@commitlint/ensure/src/index.ts
@@ -4,7 +4,8 @@ import maxLength from './max-length';
 import maxLineLength from './max-line-length';
 import minLength from './min-length';
 import notEmpty from './not-empty';
+import toCase from './to-case';
 
 export {ensureCase as case};
 export {ensureEnum as enum};
-export {maxLength, maxLineLength, minLength, notEmpty};
+export {maxLength, maxLineLength, minLength, notEmpty, toCase};
diff --git a/@commitlint/ensure/src/to-case.ts b/@commitlint/ensure/src/to-case.ts
new file mode 100644
index 0000000000..84cee84ac0
--- /dev/null
+++ b/@commitlint/ensure/src/to-case.ts
@@ -0,0 +1,33 @@
+import {TargetCaseType} from '@commitlint/types';
+import camelCase from 'lodash/camelCase';
+import kebabCase from 'lodash/kebabCase';
+import snakeCase from 'lodash/snakeCase';
+import upperFirst from 'lodash/upperFirst';
+import startCase from 'lodash/startCase';
+
+export default function toCase(input: string, target: TargetCaseType): string {
+	switch (target) {
+		case 'camel-case':
+			return camelCase(input);
+		case 'kebab-case':
+			return kebabCase(input);
+		case 'snake-case':
+			return snakeCase(input);
+		case 'pascal-case':
+			return upperFirst(camelCase(input));
+		case 'start-case':
+			return startCase(input);
+		case 'upper-case':
+		case 'uppercase':
+			return input.toUpperCase();
+		case 'sentence-case':
+		case 'sentencecase':
+			return upperFirst(input);
+		case 'lower-case':
+		case 'lowercase':
+		case 'lowerCase': // Backwards compat config-angular v4
+			return input.toLowerCase();
+		default:
+			throw new TypeError(`to-case: Unknown target case "${target}"`);
+	}
+}
diff --git a/@commitlint/prompt/package.json b/@commitlint/prompt/package.json
index cfccefc1b2..0b2dc1dba4 100644
--- a/@commitlint/prompt/package.json
+++ b/@commitlint/prompt/package.json
@@ -41,10 +41,10 @@
     "commitizen": "4.2.4"
   },
   "dependencies": {
+    "@commitlint/ensure": "^14.0.0",
     "@commitlint/load": "^14.0.0",
     "@commitlint/types": "^14.0.0",
     "chalk": "^4.0.0",
-    "lodash": "^4.17.19",
     "throat": "^6.0.0",
     "vorpal": "^1.12.0"
   },
diff --git a/@commitlint/prompt/src/library/get-forced-case-fn.test.ts b/@commitlint/prompt/src/library/get-forced-case-fn.test.ts
index 0b630876bb..f112745506 100644
--- a/@commitlint/prompt/src/library/get-forced-case-fn.test.ts
+++ b/@commitlint/prompt/src/library/get-forced-case-fn.test.ts
@@ -32,13 +32,14 @@ test('should not apply', () => {
 });
 
 test('should throw error on invalid casing', () => {
-	expect(() =>
-		getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always']])
-	).toThrow('Unknown target case "undefined"');
+	let rule = getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always']]);
+	expect(() => rule('test')).toThrow('Unknown target case "undefined"');
 
-	expect(() =>
-		getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always', 'foo']])
-	).toThrow('Unknown target case "foo"');
+	rule = getForcedCaseFn([
+		'name',
+		[RuleConfigSeverity.Warning, 'always', 'foo'],
+	]);
+	expect(() => rule('test')).toThrow('Unknown target case "foo"');
 });
 
 test('should convert text correctly', () => {
@@ -88,13 +89,13 @@ test('should convert text correctly', () => {
 		'name',
 		[RuleConfigSeverity.Warning, 'always', 'sentence-case'],
 	]);
-	expect(rule('TEST_FOOBar-baz baz')).toBe('Test_foobar-baz baz');
+	expect(rule('TEST_FOOBar-baz baz')).toBe('TEST_FOOBar-baz baz');
 
 	rule = getForcedCaseFn([
 		'name',
 		[RuleConfigSeverity.Warning, 'always', 'sentencecase'],
 	]);
-	expect(rule('TEST_FOOBar-baz baz')).toBe('Test_foobar-baz baz');
+	expect(rule('TEST_FOOBar-baz baz')).toBe('TEST_FOOBar-baz baz');
 
 	rule = getForcedCaseFn([
 		'name',
diff --git a/@commitlint/prompt/src/library/get-forced-case-fn.ts b/@commitlint/prompt/src/library/get-forced-case-fn.ts
index 74b285afa8..ae9bddad5e 100644
--- a/@commitlint/prompt/src/library/get-forced-case-fn.ts
+++ b/@commitlint/prompt/src/library/get-forced-case-fn.ts
@@ -1,10 +1,7 @@
-import camelCase from 'lodash/camelCase';
-import kebabCase from 'lodash/kebabCase';
-import snakeCase from 'lodash/snakeCase';
-import upperFirst from 'lodash/upperFirst';
-import startCase from 'lodash/startCase';
+import {toCase} from '@commitlint/ensure';
 import {RuleEntry} from './types';
 import {ruleIsActive, ruleIsNotApplicable} from './utils';
+import {TargetCaseType} from '@commitlint/types';
 
 /**
  * Get forced case for rule
@@ -26,29 +23,5 @@ export default function getForcedCaseFn(
 		return noop;
 	}
 
-	switch (target) {
-		case 'camel-case':
-			return (input: string) => camelCase(input);
-		case 'kebab-case':
-			return (input: string) => kebabCase(input);
-		case 'snake-case':
-			return (input: string) => snakeCase(input);
-		case 'pascal-case':
-			return (input: string) => upperFirst(camelCase(input));
-		case 'start-case':
-			return (input: string) => startCase(input);
-		case 'upper-case':
-		case 'uppercase':
-			return (input: string) => input.toUpperCase();
-		case 'sentence-case':
-		case 'sentencecase':
-			return (input: string) =>
-				`${input.charAt(0).toUpperCase()}${input.substring(1).toLowerCase()}`;
-		case 'lower-case':
-		case 'lowercase':
-		case 'lowerCase': // Backwards compat config-angular v4
-			return (input: string) => input.toLowerCase();
-		default:
-			throw new TypeError(`Unknown target case "${target}"`);
-	}
+	return (input: string) => toCase(input, target as TargetCaseType);
 }