diff --git a/.gitignore b/.gitignore
index 8b2360016d31..fe6e2b9ccf68 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,8 @@ ID
 /.clang_complete
 /machrc
 /.machrc
+# pyenv artifact
+/.python-version
 
 # Empty marker file that's generated when we check out NSS
 security/manager/.nss.checkout
diff --git a/.hgignore b/.hgignore
index 9e8508cfa635..6c57908a66cd 100644
--- a/.hgignore
+++ b/.hgignore
@@ -32,6 +32,8 @@ compile_commands\.json
 ^config\.log$
 ^\.clang_complete
 ^\.?machrc$
+# pyenv artifact
+^\.python-version$
 
 # Empty marker file that's generated when we check out NSS
 ^security/manager/\.nss\.checkout$