diff --git a/ci/axis/nightly.yaml b/ci/axis/nightly.yaml
index d68080c2..bda2bfae 100644
--- a/ci/axis/nightly.yaml
+++ b/ci/axis/nightly.yaml
@@ -7,6 +7,7 @@ CONDA_CONFIG_FILE:
 # Use M.X.Ya (major.minor.patch) with 'a' version to match nightly tag
 RAPIDS_VER:
   - 21.06.00a
+  - 21.08.00a
 
 # Use CUDA_VER to not clobber `CUDA_VERSION` in the container
 CUDA_VER: