diff --git a/pyrit/cli/_output.py b/pyrit/cli/_output.py
index 7eb642aec6..53136e15c8 100644
--- a/pyrit/cli/_output.py
+++ b/pyrit/cli/_output.py
@@ -345,6 +345,10 @@ def print_scenario_run_progress(*, run: ScenarioRunSummary, total_techniques: in
         bar_width = 30
         filled = int(bar_width * techniques_done / effective_total)
         bar = "█" * filled + "░" * (bar_width - filled)
+        try:
+            bar.encode(sys.stdout.encoding or "utf-8")
+        except (LookupError, UnicodeEncodeError):
+            bar = "#" * filled + "-" * (bar_width - filled)
         parts.append(f"[{bar}] techniques: {techniques_done}/{effective_total} ({pct}%)")
     else:
         parts.append(f"techniques: {techniques_done}")
diff --git a/pyrit/output/sink.py b/pyrit/output/sink.py
index f7d9642475..e4549fbc30 100644
--- a/pyrit/output/sink.py
+++ b/pyrit/output/sink.py
@@ -2,6 +2,7 @@
 # Licensed under the MIT license.
 
 import asyncio
+import sys
 from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import Literal
@@ -41,7 +42,12 @@ async def write_async(self, data: str) -> None:
         Args:
             data (str): The text to print.
         """
-        print(data, end="")
+        encoding = sys.stdout.encoding or "utf-8"
+        try:
+            data.encode(encoding)
+        except (LookupError, UnicodeEncodeError):
+            data = data.encode(encoding, errors="replace").decode(encoding)
+        sys.stdout.write(data)
 
 
 class FileSink(Sink):
diff --git a/tests/unit/cli/test_output.py b/tests/unit/cli/test_output.py
index c3fd62a7c2..84c18fa05b 100644
--- a/tests/unit/cli/test_output.py
+++ b/tests/unit/cli/test_output.py
@@ -389,6 +389,24 @@ def test_print_scenario_run_progress_with_known_totals(capsys):
     assert "attacks" not in captured.out
 
 
+def test_print_scenario_run_progress_uses_ascii_for_limited_console():
+    run = _make_run(
+        status=ScenarioRunState.IN_PROGRESS,
+        total_attacks=10,
+        completed_attacks=5,
+        objective_achieved_rate=30,
+        techniques_used=["s1"],
+    )
+    stdout = MagicMock()
+    stdout.encoding = "cp1252"
+
+    with patch.object(_output.sys, "stdout", stdout):
+        _output.print_scenario_run_progress(run=run, total_techniques=2)
+
+    line = stdout.write.call_args.args[0]
+    assert "[###############---------------]" in line
+
+
 def test_print_scenario_run_progress_no_techniques(capsys):
     run = _make_run(
         status=ScenarioRunState.CREATED,
diff --git a/tests/unit/output/test_sink.py b/tests/unit/output/test_sink.py
index f4a5b85238..5859f401a3 100644
--- a/tests/unit/output/test_sink.py
+++ b/tests/unit/output/test_sink.py
@@ -31,6 +31,17 @@ async def test_stdout_sink_no_trailing_newline(capsys):
     assert captured.out == "line1line2"
 
 
+async def test_stdout_sink_replaces_unsupported_unicode():
+    stdout = MagicMock()
+    stdout.encoding = "cp1252"
+    sink = StdoutSink()
+
+    with patch("pyrit.output.sink.sys.stdout", stdout):
+        await sink.write_async("📊─")
+
+    stdout.write.assert_called_once_with("??")
+
+
 async def test_file_sink_writes_to_file():
     with tempfile.NamedTemporaryFile(delete=False, suffix=".txt") as f:
         path = Path(f.name)