diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 36ecc8b..4b46beb 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -80,9 +80,20 @@ jobs:
         echo "VERSION=$VERSION" >> $GITHUB_ENV
         echo "version=$VERSION" >> $GITHUB_OUTPUT
     
+    - name: Get previous release tag
+      id: previous_tag
+      run: |
+        PREVIOUS_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
+        echo "previous_tag=$PREVIOUS_TAG" >> $GITHUB_OUTPUT
+        echo "Previous tag: $PREVIOUS_TAG"
+
     - name: Update version
       run: |
         python scripts/update_version.py "${{ env.VERSION }}"
+
+    - name: Update changelog
+      run: |
+        python scripts/update_changelog.py "${{ env.VERSION }}" "${{ steps.previous_tag.outputs.previous_tag }}"
     
     - name: Install build dependencies
       run: |
@@ -125,6 +136,8 @@ jobs:
         PYPROJECT_SHA=$(gh api /repos/$GITHUB_REPOSITORY/contents/pyproject.toml --jq '.sha')
         echo "Getting SHA for _version.py"
         VERSION_SHA=$(gh api /repos/$GITHUB_REPOSITORY/contents/src/claude_agent_sdk/_version.py --jq '.sha')
+        echo "Getting SHA for CHANGELOG.md"
+        CHANGELOG_SHA=$(gh api /repos/$GITHUB_REPOSITORY/contents/CHANGELOG.md --jq '.sha')
 
         # Commit pyproject.toml via GitHub API (this creates signed commits)
         message="chore: bump version to ${{ env.VERSION }}"
@@ -146,18 +159,29 @@ jobs:
           -F content=@version.py.b64 \
           -f sha="$VERSION_SHA" \
           -f branch="$BRANCH_NAME"
+
+        # Commit CHANGELOG.md via GitHub API
+        base64 -i CHANGELOG.md > changelog.b64
+        gh api \
+          --method PUT \
+          /repos/$GITHUB_REPOSITORY/contents/CHANGELOG.md \
+          -f message="$message" \
+          -F content=@changelog.b64 \
+          -f sha="$CHANGELOG_SHA" \
+          -f branch="$BRANCH_NAME"
         
         # Create PR using GitHub CLI
         PR_BODY="This PR updates the version to ${{ env.VERSION }} after publishing to PyPI.
-        
+
         ## Changes
         - Updated version in \`pyproject.toml\`
         - Updated version in \`src/claude_agent_sdk/_version.py\`
-        
+        - Updated \`CHANGELOG.md\` with release notes
+
         ## Release Information
         - Published to PyPI: https://pypi.org/project/claude-agent-sdk/${{ env.VERSION }}/
         - Install with: \`pip install claude-agent-sdk==${{ env.VERSION }}\`
-        
+
         🤖 Generated by GitHub Actions"
         
         PR_URL=$(gh pr create \
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b642093..94b1b4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.1.1
+
+### New Features
+
+- **Custom transport support**: `ClaudeSDKClient` now supports custom transport implementations, enabling advanced use cases like custom CLI wrappers or alternative communication protocols (#187)
+
+### Improvements
+
+- Add minimum Claude Code version check (2.0.0+) to ensure compatibility (#206)
+- Update model references to `claude-sonnet-4-5` (#198)
+- Update `PermissionResult` to match latest control protocol (#209)
+
 ## 0.1.0
 
 Introducing the Claude Agent SDK! The Claude Code SDK has been renamed to better reflect its capabilities for building AI agents across all domains, not just coding.
diff --git a/scripts/update_changelog.py b/scripts/update_changelog.py
new file mode 100755
index 0000000..9fe2ff3
--- /dev/null
+++ b/scripts/update_changelog.py
@@ -0,0 +1,175 @@
+#!/usr/bin/env python3
+"""Update CHANGELOG.md with a new version entry based on git commits."""
+
+import sys
+import subprocess
+import re
+from pathlib import Path
+from collections import defaultdict
+
+
+def get_commits_since_tag(previous_tag: str | None) -> list[str]:
+    """Get commit messages since the previous tag."""
+    if previous_tag:
+        cmd = ["git", "log", "--oneline", f"{previous_tag}..HEAD"]
+    else:
+        cmd = ["git", "log", "--oneline"]
+
+    result = subprocess.run(cmd, capture_output=True, text=True, check=True)
+    return [line for line in result.stdout.strip().split("\n") if line]
+
+
+def parse_commit(commit_line: str) -> tuple[str, str, str]:
+    """Parse a commit line into (hash, type, message).
+
+    Returns (hash, type, message) where type is one of:
+    - feat: New features
+    - fix: Bug fixes
+    - docs: Documentation changes
+    - chore: Maintenance tasks
+    - refactor: Code refactoring
+    - test: Test changes
+    - other: Everything else
+    """
+    match = re.match(r"^(\w+)\s+(.*)$", commit_line)
+    if not match:
+        return "", "other", commit_line
+
+    commit_hash = match.group(1)
+    message = match.group(2)
+
+    # Skip version bump commits
+    if message.startswith("chore: bump version"):
+        return commit_hash, "skip", message
+
+    # Detect commit type from conventional commit format
+    if message.startswith("feat:") or message.startswith("feat("):
+        return commit_hash, "feat", message.split(":", 1)[1].strip()
+    elif message.startswith("fix:") or message.startswith("fix("):
+        return commit_hash, "fix", message.split(":", 1)[1].strip()
+    elif message.startswith("docs:") or message.startswith("docs("):
+        return commit_hash, "docs", message.split(":", 1)[1].strip()
+    elif message.startswith("refactor:") or message.startswith("refactor("):
+        return commit_hash, "refactor", message.split(":", 1)[1].strip()
+    elif message.startswith("test:") or message.startswith("test("):
+        return commit_hash, "test", message.split(":", 1)[1].strip()
+    elif message.startswith("chore:") or message.startswith("chore("):
+        return commit_hash, "chore", message.split(":", 1)[1].strip()
+    else:
+        # For non-conventional commits, try to infer from message
+        msg_lower = message.lower()
+        if any(word in msg_lower for word in ["fix", "fixes", "fixed", "bugfix"]):
+            return commit_hash, "fix", message
+        elif any(word in msg_lower for word in ["add", "adds", "added", "new", "support"]):
+            return commit_hash, "feat", message
+        elif any(word in msg_lower for word in ["update", "updates", "updated", "improve"]):
+            return commit_hash, "improvement", message
+        else:
+            return commit_hash, "other", message
+
+
+def generate_changelog_entry(version: str, previous_tag: str | None) -> str:
+    """Generate a changelog entry for the given version."""
+    commits = get_commits_since_tag(previous_tag)
+
+    if not commits:
+        return f"## {version}\n\nNo changes.\n"
+
+    # Group commits by type
+    grouped: dict[str, list[str]] = defaultdict(list)
+    for commit_line in commits:
+        commit_hash, commit_type, message = parse_commit(commit_line)
+        if commit_type != "skip":
+            grouped[commit_type].append(message)
+
+    # Build changelog entry
+    entry_lines = [f"## {version}\n"]
+
+    # New features
+    if "feat" in grouped:
+        entry_lines.append("### New Features\n")
+        for msg in grouped["feat"]:
+            entry_lines.append(f"- {msg}")
+        entry_lines.append("")
+
+    # Bug fixes
+    if "fix" in grouped:
+        entry_lines.append("### Bug Fixes\n")
+        for msg in grouped["fix"]:
+            entry_lines.append(f"- {msg}")
+        entry_lines.append("")
+
+    # Improvements
+    if "improvement" in grouped or "refactor" in grouped:
+        entry_lines.append("### Improvements\n")
+        for msg in grouped.get("improvement", []) + grouped.get("refactor", []):
+            entry_lines.append(f"- {msg}")
+        entry_lines.append("")
+
+    # Documentation
+    if "docs" in grouped:
+        entry_lines.append("### Documentation\n")
+        for msg in grouped["docs"]:
+            entry_lines.append(f"- {msg}")
+        entry_lines.append("")
+
+    # Other changes
+    other_changes = (
+        grouped.get("chore", []) +
+        grouped.get("test", []) +
+        grouped.get("other", [])
+    )
+    if other_changes:
+        entry_lines.append("### Other Changes\n")
+        for msg in other_changes:
+            entry_lines.append(f"- {msg}")
+        entry_lines.append("")
+
+    return "\n".join(entry_lines)
+
+
+def update_changelog(version: str, previous_tag: str | None) -> None:
+    """Update CHANGELOG.md with a new version entry."""
+    changelog_path = Path("CHANGELOG.md")
+
+    if not changelog_path.exists():
+        print("Error: CHANGELOG.md not found")
+        sys.exit(1)
+
+    content = changelog_path.read_text()
+
+    # Generate new entry
+    new_entry = generate_changelog_entry(version, previous_tag)
+
+    # Insert after "# Changelog" header
+    if "# Changelog" not in content:
+        print("Error: CHANGELOG.md does not contain '# Changelog' header")
+        sys.exit(1)
+
+    # Split at the header and insert new entry
+    parts = content.split("# Changelog\n", 1)
+    if len(parts) != 2:
+        print("Error: Could not split CHANGELOG.md at '# Changelog' header")
+        sys.exit(1)
+
+    updated_content = f"{parts[0]}# Changelog\n\n{new_entry}\n{parts[1]}"
+
+    changelog_path.write_text(updated_content)
+    print(f"Updated CHANGELOG.md with version {version}")
+
+
+def main() -> None:
+    """Main entry point."""
+    if len(sys.argv) < 2 or len(sys.argv) > 3:
+        print("Usage: python scripts/update_changelog.py <version> [previous_tag]")
+        print("Example: python scripts/update_changelog.py 0.1.2 v0.1.1")
+        sys.exit(1)
+
+    version = sys.argv[1]
+    previous_tag = sys.argv[2] if len(sys.argv) > 2 else None
+
+    update_changelog(version, previous_tag)
+
+
+if __name__ == "__main__":
+    main()