diff --git a/.gitmodules b/.gitmodules
index 8d6b7bb..6436d87 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "mlkem"]
 	path = third-party/mlkem
 	url = https://github.com/pq-code-package/mlkem-native/
+[submodule "third-party/cjson"]
+	path = third-party/cjson
+	url = https://github.com/davegamble/cjson
diff --git a/third-party/cjson b/third-party/cjson
new file mode 160000
index 0000000..c859b25
--- /dev/null
+++ b/third-party/cjson
@@ -0,0 +1 @@
+Subproject commit c859b25da02955fef659d658b8f324b5cde87be3