diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7bae6b9b..fcabeb0b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,8 @@ and this project adheres to
 
 ## [5.3.3] - 2026-03-26
 
+Security fixes and thai2rom_onnx bug fixes.
+
 ### Added
 
 - `EntitySpan` TypedDict to allow type checking of members (#1363).
diff --git a/CITATION.cff b/CITATION.cff
index b6d760a26..9ea3e5b21 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -24,7 +24,7 @@ abstract: PyThaiNLP is a Thai natural language processing library for Python. It
 repository-code: "https://github.com/PyThaiNLP/pythainlp"
 type: software
 doi: 10.5281/zenodo.3519354
-version: 5.3.2
+version: 5.3.3
 license-url: "https://spdx.org/licenses/Apache-2.0"
 keywords:
   - computational linguistics
@@ -38,4 +38,4 @@ keywords:
   - Thai NLP
   - Thai language
   - tokenization
-date-released: 2026-03-19
+date-released: 2026-03-26
diff --git a/README.md b/README.md
index 7215c8b12..5cb463a44 100644
--- a/README.md
+++ b/README.md
@@ -31,8 +31,8 @@ pip install pythainlp
 
 | Version | Python version | Changes | Documentation |
 |:-------:|:--------------:|:-------:|:-------------:|
-| [5.3.2](https://github.com/PyThaiNLP/pythainlp/releases) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/blob/dev/CHANGELOG.md#532---2026-03-19) | [pythainlp.org/docs](https://pythainlp.org/docs) |
-| [`dev`](https://github.com/PyThaiNLP/pythainlp/tree/dev) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/compare/v5.3.2...HEAD) | [pythainlp.org/dev-docs](https://pythainlp.org/dev-docs/) |
+| [5.3.3](https://github.com/PyThaiNLP/pythainlp/releases) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/blob/dev/CHANGELOG.md#533---2026-03-26) | [pythainlp.org/docs](https://pythainlp.org/docs) |
+| [`dev`](https://github.com/PyThaiNLP/pythainlp/tree/dev) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/compare/v5.3.3...HEAD) | [pythainlp.org/dev-docs](https://pythainlp.org/dev-docs/) |
 
 ## Features
 
diff --git a/README_TH.md b/README_TH.md
index f6a949250..f15b96d1e 100644
--- a/README_TH.md
+++ b/README_TH.md
@@ -29,8 +29,8 @@ pip install pythainlp
 
 | รุ่น | รุ่นของ Python | มีอะไรเปลี่ยน | เอกสาร |
 | :-: | :-: | :-: | :-: |
-| [5.3.2](https://github.com/PyThaiNLP/pythainlp/releases) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/blob/dev/CHANGELOG.md#532---2026-03-19) | [pythainlp.org/docs](https://pythainlp.org/docs) |
-| [`dev`](https://github.com/PyThaiNLP/pythainlp/tree/dev) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/compare/v5.3.2...HEAD) | [pythainlp.org/dev-docs](https://pythainlp.org/dev-docs/) |
+| [5.3.3](https://github.com/PyThaiNLP/pythainlp/releases) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/blob/dev/CHANGELOG.md#533---2026-03-26) | [pythainlp.org/docs](https://pythainlp.org/docs) |
+| [`dev`](https://github.com/PyThaiNLP/pythainlp/tree/dev) | 3.9+ | [Log](https://github.com/PyThaiNLP/pythainlp/compare/v5.3.3...HEAD) | [pythainlp.org/dev-docs](https://pythainlp.org/dev-docs/) |
 
 ## ความสามารถ
 
diff --git a/codemeta.json b/codemeta.json
index 41e3cbd73..f93d74c34 100644
--- a/codemeta.json
+++ b/codemeta.json
@@ -47,7 +47,7 @@
     "codeRepository": "https://github.com/PyThaiNLP/pythainlp",
     "copyrightYear": 2026,
     "dateCreated": "2016-06-27",
-    "dateModified": "2026-03-19",
+    "dateModified": "2026-03-26",
     "datePublished": "2016-06-27",
     "description": "PyThaiNLP is a Thai natural language processing library for Python. It provides standard linguistic analysis for the Thai language, including tokenization and part-of-speech tagging. Additionally, it offers standard Thai locale utility functions, such as Thai Buddhist Era date formatting and the conversion of numbers into Thai text.",
     "developmentStatus": "active",
@@ -197,5 +197,5 @@
         "https://pythainlp.org/Model-Cards/"
     ],
     "url": "https://pythainlp.org/",
-    "version": "5.3.2"
+    "version": "5.3.3"
 }
diff --git a/pyproject.toml b/pyproject.toml
index cd405a834..8eee56708 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "pythainlp"
-version = "5.3.2"
+version = "5.3.3"
 description = "Thai Natural Language Processing library"
 readme = "README.md"
 requires-python = ">=3.9"
@@ -313,7 +313,7 @@ include = [
 
 # Bumpversion configuration
 [tool.bumpversion]
-current_version = "5.3.2"
+current_version = "5.3.3"
 commit = true
 tag = true
 parse = "(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)(\\-(?P<release>[a-z]+)(?P<build>\\d+))?"
diff --git a/pythainlp/__init__.py b/pythainlp/__init__.py
index f7a81d545..a2091e94b 100644
--- a/pythainlp/__init__.py
+++ b/pythainlp/__init__.py
@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: 2016-2026 PyThaiNLP Project
 # SPDX-FileType: SOURCE
 # SPDX-License-Identifier: Apache-2.0
-__version__ = "5.3.2"
+__version__ = "5.3.3"
 
 thai_consonants: str = (
     "กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรลวศษสหฬอฮ"  # 44 chars