diff --git a/.idea/.gitignore b/.idea/.gitignore
index 03d7c2646..a87f3fbd7 100644
--- a/.idea/.gitignore
+++ b/.idea/.gitignore
@@ -7,3 +7,5 @@
 /dataSources/
 /dataSources.local.xml
 /markdown.xml
+# GitHub Copilot persisted chat sessions
+/copilot/chatSessions