diff --git a/.gitignore b/.gitignore
index 2c5ee63bc3ee9..678f4fc73cec2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,9 @@
 .DS_Store
 .idea/*
 .vscode/*
+
+# Buildkite: cryptic plugin
+# Ignore the unencrypted repo_key
+repo_key
+# Ignore any agent keys (public or private) we have stored
+agent_key*