diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 066ef193c..8f335d0ec 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -47,11 +47,11 @@ jobs:
       - id: set-matrix
         run: |
           if [ -z "${{ github.event.action }}" ]; then
-            # For nightly release, we only run on python 3.8
-            echo '::set-output name=matrix::{"include":[{"name":"taichi-nightly","python":"3.8","conda_python":"py38"}]}"'
+            # For nightly release, we only run on python 3.9
+            echo '::set-output name=matrix::{"include":[{"name":"taichi-nightly","python":"3.9","conda_python":"py39"}]}"'
 
             # M1 only supports py38 and py39(conda), so change matrix.
-            echo '::set-output name=matrix_osx::{"include":[{"name":"taichi-nightly","python":"3.8"}]}"'
+            echo '::set-output name=matrix_osx::{"include":[{"name":"taichi-nightly","python":"3.9"}]}"'
           else
             # For production release, we run on four python versions.
             echo '::set-output name=matrix::{"include":[{"name":"taichi","python":"3.6","conda_python":"py36"},{"name":"taichi","python":"3.7","conda_python":"py37"},{"name":"taichi","python":"3.8","conda_python":"py38"},{"name":"taichi","python":"3.9","conda_python":"py39"}]}"'