diff --git a/python/sglang/srt/layers/extend_attention.py b/python/sglang/srt/layers/extend_attention.py
index 0a03f6562..097adca3c 100644
--- a/python/sglang/srt/layers/extend_attention.py
+++ b/python/sglang/srt/layers/extend_attention.py
@@ -275,7 +275,9 @@ def extend_attention_fwd(
         BLOCK_DPE = 0
     BLOCK_DV = Lv
 
-    if CUDA_CAPABILITY[0] >= 8:
+    if CUDA_CAPABILITY[0] >= 9:
+        BLOCK_M, BLOCK_N = (128, 64)
+    elif CUDA_CAPABILITY[0] >= 8:
         BLOCK_M, BLOCK_N = (128, 128) if Lq <= 128 else (64, 64)
     else:
         BLOCK_M, BLOCK_N = (64, 64) if Lq <= 128 else (32, 32)