diff --git a/.github/.release-please-manifest-v2.json b/.github/.release-please-manifest-v2.json
index 0739396e62..4a263fa42a 100644
--- a/.github/.release-please-manifest-v2.json
+++ b/.github/.release-please-manifest-v2.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.0.0-alpha.0"
+  ".": "2.0.0-alpha.1"
 }
diff --git a/CHANGELOG-v2.md b/CHANGELOG-v2.md
new file mode 100644
index 0000000000..fd8796b82b
--- /dev/null
+++ b/CHANGELOG-v2.md
@@ -0,0 +1,14 @@
+# Changelog
+
+## [2.0.0-alpha.1](https://github.com/google/adk-python/compare/v2.0.0-alpha.0...v2.0.0-alpha.1) (2026-03-18)
+
+### Features
+
+Introduces two major capabilities:
+* Workflow runtime: graph-based execution engine for composing
+  deterministic execution flows for agentic apps, with support for
+  routing, fan-out/fan-in, loops, retry, state management, dynamic
+  nodes, human-in-the-loop, and nested workflows
+* Task API: structured agent-to-agent delegation with multi-turn
+  task mode, single-turn controlled output, mixed delegation
+  patterns, human-in-the-loop, and task agents as workflow nodes