diff --git a/lib/utils/to-gavel-result.js b/lib/utils/to-gavel-result.js
deleted file mode 100644
index 80c49240..00000000
--- a/lib/utils/to-gavel-result.js
+++ /dev/null
@@ -1,31 +0,0 @@
-const jsonPointer = require('json-pointer');
-
-function splitProperty(property) {
-  return property.split(/\.|\[|\]/).filter(Boolean);
-}
-
-function reduceProperties(acc, property) {
-  return acc.concat(splitProperty(property));
-}
-
-/**
- * Converts legacy (Amanda/TV4) error messages
- * to the Gavel-compliant structure.
- */
-function toGavelResult(legacyErrors) {
-  return Array.from({ length: legacyErrors.length }, (_, index) => {
-    const item = legacyErrors[index];
-    const propertyPath = item.property.reduce(reduceProperties, []);
-    const pointer = jsonPointer.compile(propertyPath);
-
-    return {
-      message: item.message,
-      location: {
-        pointer,
-        property: propertyPath
-      }
-    };
-  });
-}
-
-module.exports = toGavelResult;
diff --git a/lib/utils/tv4-to-headers-message.js b/lib/utils/tv4-to-headers-message.js
deleted file mode 100644
index 1f49f3d5..00000000
--- a/lib/utils/tv4-to-headers-message.js
+++ /dev/null
@@ -1,23 +0,0 @@
-const caseless = require('caseless');
-
-module.exports = (message, expectedHeaders) => {
-  let newMessage;
-
-  if (message.includes('Missing required property:')) {
-    const headerName = message.split('Missing required property: ')[1];
-    newMessage = `Header '${headerName}' is missing`;
-  } else if (message.includes('No enum match for: ')) {
-    const splitted = message.split('\' No enum match for: "');
-    const headerName = splitted[0].replace(/^At '\//, '');
-    const headerValue = splitted[1].replace(/"$/, '');
-
-    const expected = caseless(expectedHeaders).get(headerName);
-    newMessage = `Header '${headerName}' has value '${headerValue}' instead of '${expected}'`;
-  } else {
-    throw new Error(
-      "Unknown tv4 error message can't convert to headers message."
-    );
-  }
-
-  return newMessage;
-};
diff --git a/lib/utils/warn-on-deprecation.js b/lib/utils/warn-on-deprecation.js
deleted file mode 100644
index caca86fb..00000000
--- a/lib/utils/warn-on-deprecation.js
+++ /dev/null
@@ -1,16 +0,0 @@
-/* eslint-disable no-console */
-
-/**
- * Outputs a deprecation message.
- * Supports silencing the messages based on the environmental variable.
- * @param {string} message
- */
-module.exports = function warnOnDeprecation(message) {
-  const shouldOutputMessage =
-    typeof process === 'undefined' ||
-    !process.env.SUPPRESS_DEPRECATION_WARNINGS;
-
-  if (shouldOutputMessage) {
-    console.warn(`DEPRECATED: ${message}`);
-  }
-};
diff --git a/test/unit/utils/to-gavel-result.test.js b/test/unit/utils/to-gavel-result.test.js
deleted file mode 100644
index 69c539e8..00000000
--- a/test/unit/utils/to-gavel-result.test.js
+++ /dev/null
@@ -1,87 +0,0 @@
-const { expect } = require('chai');
-const toGavelResult = require('../../../lib/utils/to-gavel-result');
-
-describe('toGavelResult', () => {
-  // Currently TV4 output is coerced to Amanda format.
-  // Then Amanda format is coerced to Gavel public API.
-  describe('given Amanda errors', () => {
-    let coercedErrors;
-
-    before(() => {
-      coercedErrors = toGavelResult({
-        length: 2,
-        0: {
-          property: ['users', 'username'],
-          propertyValue: 123,
-          attributeName: 'type',
-          attributeValue: 'string',
-          message: 'Amanda error message'
-        },
-        1: {
-          property: ['friends[2]', 'online'],
-          propertyValue: false,
-          attributeName: 'type',
-          attributeValue: 'boolean',
-          message: 'Arbitrary error message about "online"'
-        }
-      });
-    });
-
-    describe('given coerced to Gavel-compliant error', () => {
-      it('should return 2 errors', () => {
-        expect(coercedErrors).to.have.lengthOf(2);
-      });
-
-      describe('given in-object error', () => {
-        it('should preserve the original error message', () => {
-          expect(coercedErrors[0]).to.have.property(
-            'message',
-            'Amanda error message'
-          );
-        });
-
-        describe('should produce "location" property', () => {
-          it('should have "pointer"', () => {
-            expect(coercedErrors[0]).to.have.nested.property(
-              'location.pointer',
-              '/users/username'
-            );
-          });
-
-          it('should have "property"', () => {
-            expect(coercedErrors[0].location.property).to.deep.equal([
-              'users',
-              'username'
-            ]);
-          });
-        });
-      });
-
-      describe('given in-array error', () => {
-        it('should preserve the original error message', () => {
-          expect(coercedErrors[1]).to.have.property(
-            'message',
-            'Arbitrary error message about "online"'
-          );
-        });
-
-        describe('should produce "location" property', () => {
-          it('should have "pointer"', () => {
-            expect(coercedErrors[1]).to.have.nested.property(
-              'location.pointer',
-              '/friends/2/online'
-            );
-          });
-
-          it('should have "property"', () => {
-            expect(coercedErrors[1].location.property).to.deep.equal([
-              'friends',
-              '2',
-              'online'
-            ]);
-          });
-        });
-      });
-    });
-  });
-});
diff --git a/test/unit/utils/tv4-to-headers-message.test.js b/test/unit/utils/tv4-to-headers-message.test.js
deleted file mode 100644
index 68cac17c..00000000
--- a/test/unit/utils/tv4-to-headers-message.test.js
+++ /dev/null
@@ -1,36 +0,0 @@
-const { assert } = require('chai');
-
-const tv4ToHeadersMessage = require('../../../lib/utils/tv4-to-headers-message');
-const fixtures = require('../../fixtures');
-
-describe('tv4ToHeadersMessages()', () => {
-  const expectedHeaders = fixtures.sampleHeaders;
-  describe('when message for missing header', () => {
-    it('should return message with right text', () => {
-      const tv4Message = "At '/header2' Missing required property: header2";
-      const message = tv4ToHeadersMessage(tv4Message, expectedHeaders);
-      assert.equal(message, "Header 'header2' is missing");
-    });
-  });
-
-  describe('when message for different value', () => {
-    it('should return message with right text', () => {
-      const tv4Message =
-        'At \'/content-type\' No enum match for: "application/fancy-madiatype"';
-      const message = tv4ToHeadersMessage(tv4Message, expectedHeaders);
-      assert.equal(
-        message,
-        `Header 'content-type' has value 'application/fancy-madiatype' instead of 'application/json'`
-      );
-    });
-  });
-
-  describe('when unknonw message', () => {
-    it('should throw an error', () => {
-      const fn = () => {
-        tv4ToHeadersMessage('String does not match pattern: {pattern}');
-      };
-      assert.throws(fn);
-    });
-  });
-});