diff --git a/src/aichat/config.yaml b/src/aichat/config.yaml
index a74af2c..51c4e2b 100644
--- a/src/aichat/config.yaml
+++ b/src/aichat/config.yaml
@@ -1,6 +1,6 @@
 # see https://github.com/sigoden/aichat/blob/main/config.example.yaml
 
-model: ollama
+model: ollama:qwen2.5
 clients:
 - type: openai-compatible
   name: ollama