diff --git a/_boring b/_boring
index 83d7bfd..567d238 100644
--- a/_boring
+++ b/_boring
@@ -55,6 +55,7 @@
 ^\.cabal-sandbox(/|$)
 ^cabal\.sandbox\.config$
 ^.stack-work(/|$)
+^stack\.yaml\.lock$
 # autotools
 (^|/)autom4te\.cache($|/)
 (^|/)config\.(log|status)$