diff --git a/.github/.release-please-manifest.json b/.github/.release-please-manifest.json
index 816df2d..2537c1f 100644
--- a/.github/.release-please-manifest.json
+++ b/.github/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.1"
+  ".": "0.4.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7cd36c..f4dc752 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://github.com/google/adk-python-community/compare/v0.3.1...v0.4.0) (2026-02-17)
+
+
+### Features
+
+* add release tag workflow ([#75](https://github.com/google/adk-python-community/issues/75)) ([bb9c361](https://github.com/google/adk-python-community/commit/bb9c361069d71802b68e5f11284a373c5bb8829d))
+
 ## [0.3.1](https://github.com/google/adk-python-community/compare/v0.3.0...v0.3.1) (2026-02-12)
 
 
diff --git a/src/google/adk_community/version.py b/src/google/adk_community/version.py
index 9ea0f5d..ce97029 100644
--- a/src/google/adk_community/version.py
+++ b/src/google/adk_community/version.py
@@ -13,4 +13,4 @@
 # limitations under the License.
 
 # version: major.minor.patch
-__version__ = "0.3.1"
+__version__ = "0.4.0"