diff --git a/CHANGELOG.md b/CHANGELOG.md
index dde2e7b..fbed04f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [v2.3.3] - 2021-01-24
+### Fixed
+- [#24](https://github.com/ivanmarban/winston-telegram/pull/24) Change parseMode prop as optional.
+
 ## [v2.3.2] - 2020-11-08
 ### Fixed
 - Tests fixed.
@@ -120,7 +124,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [v0.1.0] - 2015-11-12
 - First version.
 
-[unreleased]: https://github.com/ivanmarban/winston-telegram/compare/v2.3.2...develop
+[unreleased]: https://github.com/ivanmarban/winston-telegram/compare/v2.3.3...develop
+[v2.3.3]: https://github.com/ivanmarban/winston-telegram/compare/v2.3.2...v2.3.3
 [v2.3.2]: https://github.com/ivanmarban/winston-telegram/compare/v2.3.1...v2.3.2
 [v2.3.1]: https://github.com/ivanmarban/winston-telegram/compare/v2.3.0...v2.3.1
 [v2.3.0]: https://github.com/ivanmarban/winston-telegram/compare/v2.2.2...v2.3.0
diff --git a/lib/winston-telegram.d.ts b/lib/winston-telegram.d.ts
index 0ce09e0..4f7787e 100644
--- a/lib/winston-telegram.d.ts
+++ b/lib/winston-telegram.d.ts
@@ -11,7 +11,7 @@ declare namespace WinstonTelegram {
     /** The Telegram chatid you want to send to. */
     chatId: number
     /** The Telegram mode for parsing entities in the message text. */
-    parseMode: string
+    parseMode?: string
     /** Level of messages that this transport should log. (default "info") */
     level?: string
     /** Whether to log only the declared level and none above. (default false) */
diff --git a/package-lock.json b/package-lock.json
index 12a7efd..7814860 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
   "name": "winston-telegram",
-  "version": "2.3.2",
+  "version": "2.3.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "2.3.1",
+      "version": "2.3.2",
       "license": "MIT",
       "dependencies": {
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@@ -17,11 +17,11 @@
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         "eslint-config-standard": "^16.0.1",
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+        "eslint-plugin-standard": "^5.0.0",
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       "dev": true,
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-        "node": ">= 6.0.0"
+        "node": ">= 10.0.0"
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@@ -2368,17 +2368,17 @@
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       "dev": true,
       "dependencies": {
-        "comment-parser": "^0.7.6",
-        "debug": "^4.2.0",
+        "comment-parser": "1.1.1",
+        "debug": "^4.3.1",
         "jsdoctypeparser": "^9.0.0",
         "lodash": "^4.17.20",
         "regextras": "^0.7.1",
-        "semver": "^7.3.2",
+        "semver": "^7.3.4",
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       },
       "engines": {
@@ -2388,6 +2388,23 @@
         "eslint": "^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/eslint-plugin-jsdoc/node_modules/debug": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
+      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
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@@ -2452,9 +2469,10 @@
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@@ -7374,10 +7392,13 @@
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+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
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       "dev": true,
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+        "lru-cache": "^6.0.0"
+      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -7391,6 +7412,24 @@
       "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w=",
       "dev": true
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+      "dev": true,
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/semver/node_modules/yallist": {
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+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
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+    },
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@@ -10310,9 +10349,9 @@
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@@ -10869,18 +10908,29 @@
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       "dev": true,
       "requires": {
-        "comment-parser": "^0.7.6",
-        "debug": "^4.2.0",
+        "comment-parser": "1.1.1",
+        "debug": "^4.3.1",
         "jsdoctypeparser": "^9.0.0",
         "lodash": "^4.17.20",
         "regextras": "^0.7.1",
-        "semver": "^7.3.2",
+        "semver": "^7.3.4",
         "spdx-expression-parse": "^3.0.1"
+      },
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+          "dev": true,
+          "requires": {
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+          }
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@@ -10928,9 +10978,9 @@
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+      "resolved": "https://registry.npmjs.org/eslint-plugin-standard/-/eslint-plugin-standard-5.0.0.tgz",
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@@ -14680,10 +14730,30 @@
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+          "dev": true,
+          "requires": {
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     "semver-compare": {
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diff --git a/package.json b/package.json
index df3b592..737b253 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "winston-telegram",
   "description": "A Telegram transport for winston",
-  "version": "2.3.2",
+  "version": "2.3.3",
   "author": "Ivan Marban",
   "repository": {
     "type": "git",
@@ -37,11 +37,11 @@
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     "eslint-config-standard": "^16.0.1",
     "eslint-plugin-import": "^2.22.1",
-    "eslint-plugin-jsdoc": "^30.7.7",
+    "eslint-plugin-jsdoc": "^31.2.2",
     "eslint-plugin-mocha": "^8.0.0",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.2.1",
-    "eslint-plugin-standard": "^4.0.2",
+    "eslint-plugin-standard": "^5.0.0",
     "mocha": "^8.2.1",
     "nock": "^13.0.4",
     "nyc": "^15.1.0",