diff --git a/.gitignore b/.gitignore
index f8118073..2754a306 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,5 @@ build/
 docs/
 utils/lv2_ttl_generator
 utils/lv2_ttl_generator.dSYM/
+
+khronos
diff --git a/dgl/src/pugl-upstream b/dgl/src/pugl-upstream
index f7b3fe46..e33b2f6b 160000
--- a/dgl/src/pugl-upstream
+++ b/dgl/src/pugl-upstream
@@ -1 +1 @@
-Subproject commit f7b3fe466e7c443b4ec60901899fc538b66c0cc1
+Subproject commit e33b2f6b0cea6d6263990aa9abe6a69fdfba5973