diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6acfaed..df87cf6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -60,6 +60,8 @@ commands:
       - run:
           name: install dependencies
           command: |
+            # https://github.com/python-poetry/poetry/issues/4210
+            poetry config experimental.new-installer false
             poetry install
 
       - run:
@@ -120,6 +122,7 @@ python-versions: &python-versions
       python_version:
         - "3.8.9"
         - "3.9.4"
+        - "3.10.0"
         - "latest"
 
 workflows:
diff --git a/pyproject.toml b/pyproject.toml
index f19c9f8..0052f49 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ classifiers = [
     'Intended Audience :: Developers',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
+    'Programming Language :: Python :: 3.10',
     'License :: OSI Approved :: BSD License',
     'Development Status :: 5 - Production/Stable'