diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 69503dd96a..c0e0902aa4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -60,6 +60,12 @@ jobs:
             mmcv: 1.8.0+cu101
             torchvision: 0.9.0+cu101
             cuda_arch: "7.0"
+          - python-version: 3.9
+            torch: 1.8.0+cu101
+            torch_version: torch1.8.0
+            mmcv: 1.8.0+cu101
+            torchvision: 0.9.0+cu101
+            cuda_arch: "7.0"
 
     steps:
       - uses: actions/checkout@v2
diff --git a/setup.py b/setup.py
index 28ec46cf2b..99fb3cd24a 100644
--- a/setup.py
+++ b/setup.py
@@ -210,6 +210,7 @@ def add_mim_extention():
             'Programming Language :: Python :: 3',
             'Programming Language :: Python :: 3.6',
             'Programming Language :: Python :: 3.7',
+            'Programming Language :: Python :: 3.9',
         ],
         license='Apache License 2.0',
         setup_requires=parse_requirements('requirements/build.txt'),