diff --git a/release.py b/release.py
index 655bf839a871..003605384583 100644
--- a/release.py
+++ b/release.py
@@ -8,6 +8,7 @@
 import subprocess
 import time
 import typing
+import urllib
 import zipfile
 
 import click
@@ -102,6 +103,108 @@ def fetch_github_actions_artifacts(
     return download_artifacts_github_actions(session, token, run_url)
 
 
+def wait_for_build_complete_circleci(
+    session: requests.Session, token: str, pipeline_id: str
+) -> None:
+    while True:
+        response = session.get(
+            f"https://circleci.com/api/v2/pipeline/{pipeline_id}/workflow",
+            headers={
+                "Circle-Token": token,
+            },
+        )
+        response.raise_for_status()
+        status = response.json()["items"][0]["status"]
+        if status == "success":
+            break
+        elif status not in ("running", "on_hold", "not_run"):
+            raise ValueError(f"CircleCI build failed with status {status}")
+        time.sleep(3)
+
+
+def download_artifacts_circleci(
+    session: requests.Session, urls: typing.List[str]
+) -> typing.List[str]:
+    paths = []
+    for url in urls:
+        name = os.path.basename(urllib.parse.urlparse(url).path)
+        response = session.get(url)
+        out_path = os.path.join(
+            os.path.dirname(__file__),
+            "dist",
+            os.path.basename(name),
+        )
+        with open(out_path, "wb") as f:
+            f.write(response.content)
+        paths.append(out_path)
+    return paths
+
+
+def fetch_circleci_artifacts(token: str, version: str) -> typing.List[str]:
+    session = requests.Session()
+
+    response = session.get(
+        "https://circleci.com/api/v2/pipeline?org-slug=gh/pyca",
+        headers={"Circle-Token": token},
+    )
+    response.raise_for_status()
+    pipeline_id = None
+    for item in response.json()["items"]:
+        if item["project_slug"] == "gh/pyca/cryptography":
+            if item["vcs"].get("tag", None) == version:
+                pipeline_id = item["id"]
+                break
+
+    if pipeline_id is None:
+        raise ValueError(f"Could not find a pipeline for version {version}")
+
+    wait_for_build_complete_circleci(session, token, pipeline_id)
+    urls = fetch_circleci_artifact_urls(session, token, pipeline_id)
+    return download_artifacts_circleci(session, urls)
+
+
+def fetch_circleci_artifact_urls(
+    session: requests.Session, token: str, pipeline_id: str
+) -> typing.List[str]:
+    response = session.get(
+        f"https://circleci.com/api/v2/pipeline/{pipeline_id}/workflow",
+        headers={"Circle-Token": token},
+    )
+    response.raise_for_status()
+    workflow_id = response.json()["items"][0]["id"]
+    job_response = session.get(
+        f"https://circleci.com/api/v2/workflow/{workflow_id}/job",
+        headers={"Circle-Token": token},
+    )
+    job_response.raise_for_status()
+    artifact_urls = []
+    for job in job_response.json()["items"]:
+        urls = fetch_circleci_artifact_url_from_job(
+            session, token, job["job_number"]
+        )
+        artifact_urls.extend(urls)
+
+    return artifact_urls
+
+
+def fetch_circleci_artifact_url_from_job(
+    session: requests.Session, token: str, job: str
+) -> typing.List[str]:
+    response = session.get(
+        f"https://circleci.com/api/v2/project/gh/pyca/cryptography/"
+        f"{job}/artifacts",
+        headers={"Circle-Token": token},
+    )
+    response.raise_for_status()
+    urls = []
+    for item in response.json()["items"]:
+        url = item.get("url", None)
+        if url is not None:
+            urls.append(url)
+
+    return urls
+
+
 @click.command()
 @click.argument("version")
 def release(version: str) -> None:
@@ -113,7 +216,12 @@ def release(version: str) -> None:
         f"https://github.com/settings/tokens/new?"
         f"description={version}&scopes=repo"
     )
+    print(
+        "Get a CircleCI token at: "
+        "https://app.circleci.com/settings/user/tokens"
+    )
     github_token = getpass.getpass("Github person access token: ")
+    circle_token = getpass.getpass("CircleCI token: ")
 
     # Tag and push the tag (this will trigger the wheel builder in Actions)
     run("git", "tag", "-s", version, "-m", "{0} release".format(version))
@@ -123,9 +231,13 @@ def release(version: str) -> None:
     github_actions_artifact_paths = fetch_github_actions_artifacts(
         github_token, version
     )
+    # Download wheels from CircleCI
+    circle_artifact_paths = fetch_circleci_artifacts(circle_token, version)
+
+    artifact_paths = github_actions_artifact_paths + circle_artifact_paths
 
     # Upload wheels and sdist
-    run("twine", "upload", *github_actions_artifact_paths)
+    run("twine", "upload", *artifact_paths)
 
 
 if __name__ == "__main__":