diff --git a/Dockerfile b/Dockerfile
index e1ea4ed..0e0aba4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,11 @@
 FROM node:12
 WORKDIR /app
 
-COPY package.json package-lock.json ./
-RUN npm install && npm cache clean --force
+COPY package.json yarn.lock ./
+RUN yarn && yarn cache clean --force
 COPY . .
 
 EXPOSE 8000
-HEALTHCHECK CMD curl -f http://localhost:8000/status
-CMD ["npm", "run", "start"]
+# HEALTHCHECK CMD curl -f http://localhost:8000/status
+ENTRYPOINT ["yarn"]
+CMD ["server"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 4398985..7cec4b4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,6 +4,7 @@ services:
   kovan:
     image: tornadocash/relayer
     restart: always
+    command: server
     environment:
       VIRTUAL_HOST: example.duckdns.org
       LETSENCRYPT_HOST: example.duckdns.org
@@ -20,24 +21,26 @@ services:
     depends_on:
       - redis
 
-  mainnet:
+  tree-monitor:
     image: tornadocash/relayer
     restart: always
+    command: tree-monitor
     environment:
-      VIRTUAL_HOST: example2.duckdns.org
-      LETSENCRYPT_HOST: example2.duckdns.org
-      NET_ID: 1
-      RPC_URL: https://mainnet.infura.io
-      # ORACLE_RPC_URL should always point to the mainnet
-      ORACLE_RPC_URL: https://mainnet.infura.io
-      # without 0x prefix
-      PRIVATE_KEY:
-      # 2.5 means 2.5%
-      RELAYER_FEE: 2.5
-      REDIS_URL: redis://redis/1
-      nginx_proxy_read_timeout: 600
-    depends_on:
-      - redis
+      qwe: ads
+
+  worker1:
+    image: tornadocash/relayer
+    restart: always
+    command: worker
+    environment:
+      PRIVATE_KEY: qwe
+
+  worker2:
+    image: tornadocash/relayer
+    restart: always
+    command: worker
+    environment:
+      PRIVATE_KEY: qwe
 
   redis:
     image: redis
diff --git a/package.json b/package.json
index 9156753..aec01de 100644
--- a/package.json
+++ b/package.json
@@ -24,14 +24,12 @@
     "gas-price-oracle": "^0.1.5",
     "ioredis": "^4.14.1",
     "node-fetch": "^2.6.0",
-    "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
     "tornado-cash-anonymity-mining": "git+https://github.com/tornadocash/tornado-anonymity-mining.git#e3ae8b98b14eb7fee7cb8c93221920a20b1e0cd8",
     "tx-manager": "git+https://github.com/tornadocash/tx-manager.git#df118be318b007e597e157504d105dfa3e6322a1",
     "uuid": "^8.3.0",
     "web3": "^1.3.0",
     "web3-core-promievent": "^1.3.0",
     "web3-utils": "^1.2.2",
-    "websnark": "git+https://github.com/tornadocash/websnark.git#86a526718cd6f6f5d31bdb1fe26a9ec8819f633e",
     "why-is-node-running": "^2.2.0"
   },
   "devDependencies": {
diff --git a/src/worker.js b/src/worker.js
index bbb7e90..3cecd77 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -89,7 +89,7 @@ async function checkTornadoFee({ args, contract }) {
 
 async function checkMiningFee({ args }) {
   const swap = new web3.eth.Contract(swapABI, swapAddress)
-  const TornAmount = await swap.getExpectedReturn(args.fee).call()
+  const TornAmount = await swap.methods.getExpectedReturn(args.fee).call()
   console.log('TornAmount', TornAmount)
 
   // todo: use desired torn/eth rate and compute the same way as in tornado