diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7245922..e802c21 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,7 +1,7 @@
 version: 2
 
 jobs:
-  build:
+  build-3.7: &build
     parallelism: 1
     working_directory: ~/app
     docker:
@@ -27,7 +27,7 @@ jobs:
 
       - run: |
           source .venv/bin/activate
-          tox
+          tox -e py37,fmt,lint
 
       - save_cache:
           key: 'tox-{{ checksum "tox.ini" }}-{{ checksum "setup.py" }}'
@@ -36,3 +36,46 @@ jobs:
 
       - store_test_results:
           path: .tox/py37/artifacts/
+
+  build-3.8:
+    parallelism: 1
+    working_directory: ~/app
+    docker:
+      - image: circleci/python:3.8.0-node-browsers
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - 'venv-3.8'
+      - restore_cache:
+          keys:
+            - 'tox-3.8-{{ checksum "tox.ini" }}-{{ checksum "setup.py" }}'
+
+      - run: |
+          python3 -m venv .venv
+          source .venv/bin/activate
+          pip install -U tox
+
+      - save_cache:
+          key: 'venv-3.8'
+          paths:
+            - .venv
+
+      - run: |
+          source .venv/bin/activate
+          tox -e py38
+
+      - save_cache:
+          key: 'tox-3.8-{{ checksum "tox.ini" }}-{{ checksum "setup.py" }}'
+          paths:
+            - .tox
+
+      - store_test_results:
+          path: .tox/py38/artifacts/
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - build-3.7
+      - build-3.8
diff --git a/.gitignore b/.gitignore
index 2e41686..f644f52 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 **/__pycache__/**
 *.egg-info
 .coverage
-.python-version
 .tox/
 .venv/
 build/
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..b7e92d4
--- /dev/null
+++ b/.python-version
@@ -0,0 +1,2 @@
+3.7.5
+3.8.0
diff --git a/aioredis_lock/locks.py b/aioredis_lock/locks.py
index 0bc0c1d..a76709d 100644
--- a/aioredis_lock/locks.py
+++ b/aioredis_lock/locks.py
@@ -18,7 +18,7 @@ def token_factory() -> str:
     return str(uuid.uuid4())
 
 
-@dataclasses.dataclass
+@dataclasses.dataclass  # pylint: disable=too-many-instance-attributes
 class RedisLock:
     """
     Implementation of distributed locking with aioredis.
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..5496d46
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,2 @@
+[pytest]
+junit_family=legacy
diff --git a/setup.py b/setup.py
index 0cbd21b..f37c9d3 100644
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: CPython",
     ],
     keywords=["aioredis", "redis", "locking", "distributed", "asyncio"],
diff --git a/tests/test_locks.py b/tests/test_locks.py
index 2a1057c..098d726 100644
--- a/tests/test_locks.py
+++ b/tests/test_locks.py
@@ -16,7 +16,7 @@ def redis_server():
 
 @pytest.fixture
 async def redis_pool(event_loop):
-    pool = await aioredis.create_redis_pool("redis://127.0.0.1:6380/0", loop=event_loop)
+    pool = await aioredis.create_redis_pool("redis://127.0.0.1:6380/0")
     yield pool
     pool.close()
     await pool.wait_closed()
@@ -24,7 +24,7 @@ async def redis_pool(event_loop):
 
 @pytest.fixture
 async def redis_connection(event_loop):
-    conn = await aioredis.create_redis("redis://127.0.0.1:6380/1", loop=event_loop)
+    conn = await aioredis.create_redis("redis://127.0.0.1:6380/1")
     yield conn
     conn.close()
     await conn.wait_closed()
diff --git a/tox.ini b/tox.ini
index cc0e627..3127c1c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
-envlist = py37, lint, fmt
+envlist = py37, py38, lint, fmt
+skip_missing_interpreters = true
 
 [testenv]
 deps =