diff --git a/docs/changelog.rst b/docs/changelog.rst
index 4669cd4..eb89761 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -6,6 +6,9 @@ Changelog
 `Unreleased`_
 -------------
 
+`1.0`_ - 2022-01-15
+-------------------
+
 Added
 ~~~~~
 
@@ -451,7 +454,8 @@ Fixed
 
 - Initial release.
 
-.. _Unreleased: https://github.com/Stranger6667/postmarker/compare/0.18.2...HEAD
+.. _Unreleased: https://github.com/Stranger6667/postmarker/compare/1.0...HEAD
+.. _1.0: https://github.com/Stranger6667/postmarker/compare/0.18.2...1.0
 .. _0.18.2: https://github.com/Stranger6667/postmarker/compare/0.18.1...0.18.2
 .. _0.18.1: https://github.com/Stranger6667/postmarker/compare/0.18.0...0.18.1
 .. _0.18.0: https://github.com/Stranger6667/postmarker/compare/0.17.1...0.18.0
diff --git a/setup.py b/setup.py
index 1089646..e63fd49 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 setup(
     name="postmarker",
     url="https://github.com/Stranger6667/postmarker",
-    version="0.18.2",
+    version="1.0",
     license="MIT",
     author="Dmitry Dygalo",
     author_email="dadygalo@gmail.com",
diff --git a/src/postmarker/__init__.py b/src/postmarker/__init__.py
index b0d7306..4802e90 100644
--- a/src/postmarker/__init__.py
+++ b/src/postmarker/__init__.py
@@ -1 +1 @@
-__version__ = "0.18.2"
+__version__ = "1.0"