diff --git a/.gitmodules b/.gitmodules
index f041c6f5..afe05acf 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -43,3 +43,6 @@
 [submodule "third_party/range-v3"]
 	path = third_party/range-v3
 	url = https://github.com/ericniebler/range-v3.git
+[submodule "third_party/Json"]
+	path = third_party/Json
+	url = https://github.com/nlohmann/json.git
diff --git a/third_party/Json b/third_party/Json
new file mode 160000
index 00000000..db78ac1d
--- /dev/null
+++ b/third_party/Json
@@ -0,0 +1 @@
+Subproject commit db78ac1d7716f56fc9f1b030b715f872f93964e4
diff --git a/third_party/prepare.sh b/third_party/prepare.sh
index 5fe60805..85e6c3cb 100755
--- a/third_party/prepare.sh
+++ b/third_party/prepare.sh
@@ -29,6 +29,7 @@ git submodule update --init protobuf
 git submodule update --init flatbuffers
 git submodule update --init gtest
 git submodule update --init cutlass
+git submodule update --init Json
 
 git submodule update --init cpuinfo