diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b719d43..11fea0f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"0.0.0"}
+{".":"1.0.0"}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29..1771b5a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Changelog
+
+## 1.0.0 (2026-10-19)
+
+
+### Features
+
+* read and write IOF XML 3.0, read IOF XML 2.0.3 ([9318865](https://github.com/MetsaApp/iofxml/commit/931886585027789a3de5d4cc18cce4e0b6940582))