diff --git a/.gitmodules b/.gitmodules
index a0e5fa5..bfdeee1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "lib/vault-periphery"]
 	path = lib/vault-periphery
 	url = https://github.com/yearn/vault-periphery
+[submodule "lib/zkevm-stb"]
+	path = lib/zkevm-stb
+	url = https://github.com/pyk/zkevm-stb
diff --git a/lib/zkevm-stb b/lib/zkevm-stb
new file mode 160000
index 0000000..e4dd77d
--- /dev/null
+++ b/lib/zkevm-stb
@@ -0,0 +1 @@
+Subproject commit e4dd77dc0013f564241e53ac7a09ed018efacc83