diff --git a/post-receive b/post-receive
index 4074b8f8..0849bcd3 100755
--- a/post-receive
+++ b/post-receive
@@ -16,7 +16,7 @@ die() {
     exit 1
 }
 
-if git diff --name-only $oldrev $newrev | grep "^mix.exs"; then
+if git diff --name-only $oldrev $newrev | grep -Ee "^mix.(exs|lock)"; then
   echo "Fetching deps"
   mix deps.get || die "mix failed to update"
 fi