diff --git a/index.js b/index.js
index aac370e..b5df488 100644
--- a/index.js
+++ b/index.js
@@ -4,5 +4,6 @@ exports.mimc7 = require("./src/mimc7");
 exports.mimcsponge = require("./src/mimcsponge");
 exports.babyJub = require("./src/babyjub");
 exports.pedersenHash = require("./src/pedersenHash");
-exports.SMT = require("./src/smt");
+exports.SMT = require("./src/smt").SMT;
+exports.SMTMemDB = require("./src/smt_memdb");
 exports.poseidon = require("./src/poseidon");
diff --git a/package.json b/package.json
index ad1d066..cd99f46 100644
--- a/package.json
+++ b/package.json
@@ -26,12 +26,12 @@
   "dependencies": {
     "blake-hash": "^1.1.0",
     "blake2b": "^2.1.3",
-    "snarkjs": "^0.1.19",
+    "snarkjs": "^0.1.20",
     "typedarray-to-buffer": "^3.1.5",
     "web3": "^1.0.0-beta.55"
   },
   "devDependencies": {
-    "circom": "0.0.28",
+    "circom": "0.0.32",
     "eslint-plugin-mocha": "^5.2.0",
     "ganache-cli": "^6.4.4",
     "mocha": "^5.2.0"
diff --git a/src/smt.js b/src/smt.js
index 841064e..197516e 100644
--- a/src/smt.js
+++ b/src/smt.js
@@ -310,3 +310,4 @@ async function newMemEmptyTrie() {
 module.exports.loadFromFile = loadFromFile;
 module.exports.newMemEmptyTrie = newMemEmptyTrie;
 module.exports.SMT = SMT;
+module.exports.SMTMemDB = SMTMemDB;