diff --git a/src/typeagent/aitools/utils.py b/src/typeagent/aitools/utils.py
index 46e81fc1..eb21f9ec 100644
--- a/src/typeagent/aitools/utils.py
+++ b/src/typeagent/aitools/utils.py
@@ -11,7 +11,6 @@
 import sys
 import time
 
-import black
 import colorama
 
 import typechat
@@ -57,6 +56,8 @@ def format_code(text: str, line_width=None) -> str:
 
     NOTE: The text must be a valid Python expression or code block.
     """
+    import black
+
     if line_width is None:
         # Use the terminal width, but cap it to 200 characters.
         line_width = min(200, shutil.get_terminal_size().columns)
diff --git a/src/typeagent/knowpro/answers.py b/src/typeagent/knowpro/answers.py
index 2c300506..58a536ed 100644
--- a/src/typeagent/knowpro/answers.py
+++ b/src/typeagent/knowpro/answers.py
@@ -5,8 +5,6 @@
 from dataclasses import dataclass
 from typing import Any
 
-import black
-
 import typechat
 
 from .answer_context_schema import AnswerContext, RelevantKnowledge, RelevantMessage
@@ -127,6 +125,8 @@ def create_question_prompt(question: str) -> str:
 
 def create_context_prompt(context: AnswerContext) -> str:
     # TODO: Use a more compact representation of the context than JSON.
+    import black
+
     prompt = [
         "[ANSWER CONTEXT]",
         "===",