diff --git a/.github/workflows/update-changelog.yml b/.github/workflows/update-changelog.yml
index ac644b7..8a96fb4 100644
--- a/.github/workflows/update-changelog.yml
+++ b/.github/workflows/update-changelog.yml
@@ -15,5 +15,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
+      - name: Install requirements
+        run: |
+          python -m pip install --upgrade pip
+          pip install --requirement scripts/requirements.txt
+
+      - name: Set git details
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
       - name: Update list
         run: python scripts/update_changelog.py
+        env:
+          PRODUCTION: true
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/scripts/requirements.txt b/scripts/requirements.txt
new file mode 100644
index 0000000..7e1669f
--- /dev/null
+++ b/scripts/requirements.txt
@@ -0,0 +1,2 @@
+gitpython
+PyGithub
diff --git a/scripts/update_changelog.py b/scripts/update_changelog.py
index 35039af..722d96c 100644
--- a/scripts/update_changelog.py
+++ b/scripts/update_changelog.py
@@ -1,33 +1,94 @@
-from datetime import datetime
+import os
+import pprint
+from copy import copy
+from datetime import datetime, timezone
 from pathlib import Path
 
+import git
+from github import Github
+
+
+# The owner and repository name. For example, octocat/Hello-World.
+GITHUB_REPOSITORY = os.getenv('GITHUB_REPOSITORY')
+
+GITHUB_TOKEN = os.getenv('GITHUB_TOKEN')
+PRODUCTION = os.getenv('PRODUCTION', False)
 
 CURRENT_FILE = Path(__file__)
 ROOT = CURRENT_FILE.parents[1]
+CHANGELOG_PATH = ROOT / 'CHANGELOG.md'
 
 
 def main():
-    # TODO: Fetch actual semantic version.
-    release_version = '9.6.2'
+    # Find most recent tag and timestamp.
+    #   git for-each-ref --format="%(refname:short) | %(creatordate)" "refs/tags/*"
+    local_repo = git.Repo(ROOT)
+    most_recent_tag = local_repo.tags[-1]
+    print('most_recent_tag: {}'.format(most_recent_tag))
+    most_recent_tag_datetime = most_recent_tag.commit.committed_datetime
+    print('most_recent_tag_datetime: {}'.format(most_recent_tag_datetime))
+
+    # Find merged pull requests since the most recent tag.
+    # TODO: Adjust number of recent pull requests to include likely number of
+    # pull requests since the last release.
+    github_repo = Github(login_or_token=GITHUB_TOKEN).get_repo(GITHUB_REPOSITORY)
+    recent_pulls = github_repo.get_pulls(
+        state='closed',
+        sort='updated',
+        direction='desc',
+    )[:10]
+    pull_request_changes = []
+    for pull in recent_pulls:
+        # print('-' * 10)
+
+        if not pull.merged:
+            # print('skipping since not merged: {}'.format(pull.title))
+            # print(pull.html_url)
+            continue
+
+        # Make merged_at timestamp offset-aware. Without this, the following
+        # error will appear:
+        #   TypeError: can't compare offset-naive and offset-aware datetimes
+        pull_merged_at = copy(pull.merged_at).replace(tzinfo=timezone.utc)
+
+        if pull_merged_at < most_recent_tag_datetime:
+            # print('skipping since merged prior to last release: {}'.format(pull.title))
+            # print(pull.html_url)
+            continue
+
+        # pprint.pprint(dir(pull))
+        pprint.pprint(pull.title)
+        pprint.pprint('most recent: {}'.format(most_recent_tag_datetime))
+        pprint.pprint('merged at:   {}'.format(pull.merged_at))
+        print(pull.html_url)
+
+        pull_request_changes.append(
+            '- {} ([#{}]({}))'.format(pull.title, pull.number, pull.html_url)
+        )
+
+        print('-' * 10)
+
+    pprint.pprint(pull_request_changes)
+
+    # TODO: Fetch next actual semantic version.
+    release_version = most_recent_tag
     release_date = datetime.today().strftime('%Y-%m-%d')
     release_title = '{} - {}'.format(release_version, release_date)
+    print('release_title: {}'.format(release_title))
 
-    # TODO: Fetch actual list of changes.
-    release_changes = 'Some change'
     release_content = (
         '## {}\n'
         '\n'
         '{}'
-    ).format(release_title, release_changes)
+    ).format(release_title, '\n'.join(pull_request_changes))
 
-    changelog_path = ROOT / 'CHANGELOG.md'
-    old_content = changelog_path.read_text()
+    old_content = CHANGELOG_PATH.read_text()
     new_content = old_content.replace(
         '<!-- CHANGELOG_PLACEHOLDER -->',
         '<!-- CHANGELOG_PLACEHOLDER -->\n\n{}'.format(release_content),
     )
-    print(new_content[:500])
-    changelog_path.write_text(new_content)
+    print(new_content[:800])
+    # CHANGELOG_PATH.write_text(new_content)
 
 
 if __name__ == '__main__':