diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..b394833b
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,20 @@
+# Changelog
+
+## 0.0.16
+
+- Introduce ClaudeSDKClient for bidirectional streaming conversation
+- Support Message input, not just string prompts, in query()
+- Raise explicit error if the cwd does not exist
+
+## 0.0.14
+
+- Add safety limits to Claude Code CLI stderr reading
+- Improve handling of output JSON messages split across multiple stream reads
+
+## 0.0.13
+
+- Update MCP (Model Context Protocol) types to align with Claude Code expectations
+- Fix multi-line buffering issue
+- Rename cost_usd to total_cost_usd in API responses
+- Fix optional cost fields handling
+
diff --git a/tests/test_changelog.py b/tests/test_changelog.py
new file mode 100644
index 00000000..be0f219c
--- /dev/null
+++ b/tests/test_changelog.py
@@ -0,0 +1,85 @@
+import re
+from pathlib import Path
+
+
+class TestChangelog:
+    def setup_method(self):
+        self.changelog_path = Path(__file__).parent.parent / "CHANGELOG.md"
+
+    def test_changelog_exists(self):
+        assert self.changelog_path.exists(), "CHANGELOG.md file should exist"
+
+    def test_changelog_starts_with_header(self):
+        content = self.changelog_path.read_text()
+        assert content.startswith("# Changelog"), (
+            "Changelog should start with '# Changelog'"
+        )
+
+    def test_changelog_has_valid_version_format(self):
+        content = self.changelog_path.read_text()
+        lines = content.split("\n")
+
+        version_pattern = re.compile(r"^## \d+\.\d+\.\d+(?:\s+\(\d{4}-\d{2}-\d{2}\))?$")
+        versions = []
+
+        for line in lines:
+            if line.startswith("## "):
+                assert version_pattern.match(line), f"Invalid version format: {line}"
+                version_match = re.match(r"^## (\d+\.\d+\.\d+)", line)
+                if version_match:
+                    versions.append(version_match.group(1))
+
+        assert len(versions) > 0, "Changelog should contain at least one version"
+
+    def test_changelog_has_bullet_points(self):
+        content = self.changelog_path.read_text()
+        lines = content.split("\n")
+
+        in_version_section = False
+        has_bullet_points = False
+
+        for i, line in enumerate(lines):
+            if line.startswith("## "):
+                if in_version_section and not has_bullet_points:
+                    raise AssertionError(
+                        "Previous version section should have at least one bullet point"
+                    )
+                in_version_section = True
+                has_bullet_points = False
+            elif in_version_section and line.startswith("- "):
+                has_bullet_points = True
+            elif in_version_section and line.strip() == "" and i == len(lines) - 1:
+                # Last line check
+                assert has_bullet_points, (
+                    "Each version should have at least one bullet point"
+                )
+
+        # Check the last section
+        if in_version_section:
+            assert has_bullet_points, (
+                "Last version section should have at least one bullet point"
+            )
+
+    def test_changelog_versions_in_descending_order(self):
+        content = self.changelog_path.read_text()
+        lines = content.split("\n")
+
+        versions = []
+        for line in lines:
+            if line.startswith("## "):
+                version_match = re.match(r"^## (\d+)\.(\d+)\.(\d+)", line)
+                if version_match:
+                    versions.append(tuple(map(int, version_match.groups())))
+
+        for i in range(1, len(versions)):
+            assert versions[i - 1] > versions[i], (
+                f"Versions should be in descending order: {versions[i - 1]} should be > {versions[i]}"
+            )
+
+    def test_changelog_no_empty_bullet_points(self):
+        content = self.changelog_path.read_text()
+        lines = content.split("\n")
+
+        for line in lines:
+            if line.strip() == "-":
+                raise AssertionError("Changelog should not have empty bullet points")