diff --git a/src/autora/doc/pipelines/main.py b/src/autora/doc/pipelines/main.py
index 33d6504..d01c407 100644
--- a/src/autora/doc/pipelines/main.py
+++ b/src/autora/doc/pipelines/main.py
@@ -187,7 +187,7 @@ def generate(
     predictions = pred.predict(prompt, [input], **param_dict)
     assert len(predictions) == 1, f"Expected only one output, got {len(predictions)}"
     logger.info(f"Writing output to {output}")
-    with open(output, "w") as f:
+    with open(output, "w", encoding="utf-8") as f:
         f.write(predictions[0])