diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb1478804..6789c6ee1 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ project(cmark-gfm)
 set(PROJECT_VERSION_MAJOR 0)
 set(PROJECT_VERSION_MINOR 29)
 set(PROJECT_VERSION_PATCH 0)
-set(PROJECT_VERSION_GFM 11)
+set(PROJECT_VERSION_GFM 12)
 set(PROJECT_VERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}.gfm.${PROJECT_VERSION_GFM})
 
 include("FindAsan.cmake")
diff --git a/changelog.txt b/changelog.txt
index 848e71029..cadb69be4 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,10 @@
+[0.29.0.gfm.12]
+
+  * Fixed polynomial time complexity issues per
+  https://github.com/github/cmark-gfm/security/advisories/GHSA-w4qg-3vf7-m9x5
+  * Added CodeQL project integration (#337)
+  * Addressed const qualifier discard compiler warnings (#330, #331)
+
 [0.29.0.gfm.11]
 
   * Improved fixes for polynomial time complexity issues per