diff --git a/.gitmodules b/.gitmodules
index b4c921d..7f458d7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "hash/cpu/src/HorizenLabs-poseidon2"]
 	path = hash/cpu/src/HorizenLabs-poseidon2
 	url = https://github.com/HorizenLabs/poseidon2
+[submodule "hash/cpu/src/constantine"]
+	path = hash/cpu/src/constantine
+	url = https://github.com/mratsim/constantine/
diff --git a/hash/cpu/src/constantine b/hash/cpu/src/constantine
new file mode 160000
index 0000000..4dd0a02
--- /dev/null
+++ b/hash/cpu/src/constantine
@@ -0,0 +1 @@
+Subproject commit 4dd0a02f1afd338f5207e40a47cac6705196b490