diff --git a/ext/commonmarker/cmark-gfm_version.h b/ext/commonmarker/cmark-gfm_version.h
index 736f2e0e..19e67d81 100644
--- a/ext/commonmarker/cmark-gfm_version.h
+++ b/ext/commonmarker/cmark-gfm_version.h
@@ -1,7 +1,7 @@
 #ifndef CMARK_GFM_VERSION_H
 #define CMARK_GFM_VERSION_H
 
-#define CMARK_GFM_VERSION ((0 << 24) | (29 << 16) | (0 << 8) | 10)
-#define CMARK_GFM_VERSION_STRING "0.29.0.gfm.10"
+#define CMARK_GFM_VERSION ((0 << 24) | (29 << 16) | (0 << 8) | 11)
+#define CMARK_GFM_VERSION_STRING "0.29.0.gfm.11"
 
 #endif
diff --git a/ext/commonmarker/cmark-upstream b/ext/commonmarker/cmark-upstream
index c8dcdc71..1e230827 160000
--- a/ext/commonmarker/cmark-upstream
+++ b/ext/commonmarker/cmark-upstream
@@ -1 +1 @@
-Subproject commit c8dcdc71ce1e2028d2d4d77c09c156512ffb3fa2
+Subproject commit 1e230827a584ebc9938c3eadc5059c55ef3c9abf