diff --git a/marimo/_cli/convert/commands.py b/marimo/_cli/convert/commands.py
index cd139f30acb..b39b77bffbb 100644
--- a/marimo/_cli/convert/commands.py
+++ b/marimo/_cli/convert/commands.py
@@ -64,7 +64,7 @@ def convert(
     if output:
         # Make dirs if needed
         maybe_make_dirs(output)
-        with open(output, "w") as f:
+        with open(output, "w", encoding="utf-8") as f:
             f.write(notebook)
         echo(f"Converted notebook saved to {output}")
     else:
diff --git a/marimo/_cli/export/commands.py b/marimo/_cli/export/commands.py
index 7a2a01912d8..8af8a7c19ff 100644
--- a/marimo/_cli/export/commands.py
+++ b/marimo/_cli/export/commands.py
@@ -45,7 +45,7 @@ def write_data(data: str) -> None:
         if output:
             # Make dirs if needed
             maybe_make_dirs(output)
-            with open(output, "w") as f:
+            with open(output, "w", encoding="utf-8") as f:
                 f.write(data)
                 f.close()
         else: