diff --git a/.gitignore b/.gitignore
index becd7f9..41f61d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 *
 !*/
 !*.*
+.nimble
+poseidon2.out
\ No newline at end of file
diff --git a/nimble.lock b/nimble.lock
new file mode 100644
index 0000000..f2ddf6e
--- /dev/null
+++ b/nimble.lock
@@ -0,0 +1,16 @@
+{
+  "version": 2,
+  "packages": {
+    "constantine": {
+      "version": "0.1.0",
+      "vcsRevision": "bc3845aa492b52f7fef047503b1592e830d1a774",
+      "url": "https://github.com/mratsim/constantine",
+      "downloadMethod": "git",
+      "dependencies": [],
+      "checksums": {
+        "sha1": "09594d4ce93e83ae377a7a9cb8fd4472b104ca4b"
+      }
+    }
+  },
+  "tasks": {}
+}
diff --git a/poseidon2.nimble b/poseidon2.nimble
index 1e7ed96..cf21d46 100644
--- a/poseidon2.nimble
+++ b/poseidon2.nimble
@@ -3,4 +3,4 @@ author = "nim-poseidon2 authors"
 description = "Poseidon2 hash function"
 license = "MIT"
 
-requires "https://github.com/mratsim/constantine#1e34ec22929eaba7bcf1681350ec21aed8f370f7"
+requires "https://github.com/mratsim/constantine#bc3845aa492b52f7fef047503b1592e830d1a774"