diff --git a/graphql/server.ts b/graphql/server.ts
index 23ead82..de01a5b 100644
--- a/graphql/server.ts
+++ b/graphql/server.ts
@@ -69,7 +69,7 @@ const setupGraphQLServer = () => {
 const graphQLServer = setupGraphQLServer();
 
 if (Config.ENV === 'development') {
-  graphQLServer.listen(3000);
+  graphQLServer.listen(4000);
 }
 
 export const graphql = onRequest(graphQLServer);
diff --git a/package.json b/package.json
index 183beef..2ee0c02 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "pg": "6.1.6",
     "pg-hstore": "^2.3.2",
     "sequelize": "4.22.6",
-    "stellar-sdk": "2.0.0-rc.2",
+    "stellar-sdk": "5.0.0",
     "stripe": "^6.5.0",
     "ts-node": "3.1.0",
     "typescript": "^2.2.2",
diff --git a/payments/stellar.ts b/payments/stellar.ts
index 52d65c4..18e83e7 100644
--- a/payments/stellar.ts
+++ b/payments/stellar.ts
@@ -1,13 +1,7 @@
 import fetch from 'node-fetch';
 import StellarSdkLibrary = require('stellar-sdk');
 import { Config } from '../config';
-export const BASE_FEE = 102; // stroops
-
-if (Config.ENV === 'production') {
-  StellarSdkLibrary.Network.usePublicNetwork();
-} else {
-  StellarSdkLibrary.Network.useTestNetwork();
-}
+export const BASE_FEE = '102'; // stroops
 
 export const stellarServer = new StellarSdkLibrary.Server(Config.HORIZON_URL);
 export const StellarSdk = StellarSdkLibrary;
@@ -223,7 +217,7 @@ export async function getUSDPrice() {
 export async function convertUSDtoXLM(USDAmount: number) {
   if (Config.ENV === 'production') {
     const currentPrice = await getUSDPrice();
-    const XLMAmount = USDAmount * currentPrice;
+    const XLMAmount = USDAmount * parseInt(currentPrice);
     return XLMAmount;
   }
   // using 12.5 cents as reference
diff --git a/yarn.lock b/yarn.lock
index 3839c37..2349cef 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -130,6 +130,13 @@
   version "8.10.43"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.10.43.tgz#8d3281a33c92a56038b05d9460a65bc1dcd5735b"
 
+"@types/randombytes@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@types/randombytes/-/randombytes-2.0.0.tgz#0087ff5e60ae68023b9bc4398b406fea7ad18304"
+  integrity sha512-bz8PhAVlwN72vqefzxa14DKNT8jK/mV66CSjwdVQM/k3Th3EPKfUtdMniwZgMedQTFuywAsfjnZsg+pEnltaMA==
+  dependencies:
+    "@types/node" "*"
+
 "@types/request@^2.0.3":
   version "2.0.8"
   resolved "https://registry.yarnpkg.com/@types/request/-/request-2.0.8.tgz#424d3de255868107ed4dd6695c65c5f1766aba80"
@@ -158,10 +165,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/urijs@^1.19.2":
-  version "1.19.3"
-  resolved "https://registry.yarnpkg.com/@types/urijs/-/urijs-1.19.3.tgz#ed90d38baf3eff1627544ad6ed3bcdeb79ef3533"
-  integrity sha512-L5tP2dEIV+OMVEVRhf8PCFMNMyO5ZBodrXpEqnGczky60lcv8l5Kl9Yi4J1yxhSVfHUe+Pr2nXJfDM+rUYNs3w==
+"@types/urijs@^1.19.6":
+  version "1.19.8"
+  resolved "https://registry.yarnpkg.com/@types/urijs/-/urijs-1.19.8.tgz#a66b2fd8b1d3cf3ef5bae7ca093b7d1b50e48c0a"
+  integrity sha512-SVQd2Qq0oL+b8VtJbQyv0cMIdU7fbRDcg2JIpcBvv+GUayJ3c5Ll1K+iivZl6ifcI6NbYcwjqDjljDFSiSGOeA==
 
 "@types/validator@*":
   version "6.2.0"
@@ -686,11 +693,6 @@ cookie@0.3.1:
   version "0.3.1"
   resolved "https://registry.yarnpkg.com/cookie/-/cookie-0.3.1.tgz#e7e0a1f9ef43b4c8ba925c5c5a96e806d16873bb"
 
-core-js@^2.6.3:
-  version "2.6.9"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
-  integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
-
 core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -1548,12 +1550,11 @@ js-tokens@^3.0.0:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
-js-xdr@^1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/js-xdr/-/js-xdr-1.1.2.tgz#aba1f0952508c83f33dd7e774fa9231b3073992b"
-  integrity sha512-ipiz1CnsyjLsba+QQd5jezGXddNKGa4oO9EODy0kWr3G3R8MNslIxkhQFpyRfY3yoY7YplhRVfC3cmXb4AobZQ==
+js-xdr@^1.1.3:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/js-xdr/-/js-xdr-1.1.4.tgz#678df4c6f8c7960de85bdf3bfa02b89df2730777"
+  integrity sha512-Xhwys9hyDZQDisxCKZi2nDhvGg6fKhsEgAUaJlzjwo32mZ2gZVIQl3+w4Le5SX5dsKDsboFdM2gnu5JALWetTg==
   dependencies:
-    core-js "^2.6.3"
     cursor "^0.1.5"
     lodash "^4.17.5"
     long "^2.2.3"
@@ -2437,6 +2438,13 @@ querystringify@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.0.0.tgz#fa3ed6e68eb15159457c89b37bc6472833195755"
 
+randombytes@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
+  integrity sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==
+  dependencies:
+    safe-buffer "^5.1.0"
+
 range-parser@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
@@ -2654,6 +2662,11 @@ safe-buffer@5.1.1, safe-buffer@^5.0.1, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.1.tgz#893312af69b2123def71f57889001671eeb2c853"
 
+safe-buffer@^5.1.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.0.tgz#b74daec49b1148f88c64b68d49b1e815c1f2f519"
+  integrity sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==
+
 safe-buffer@^5.1.1, safe-buffer@^5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
@@ -2854,36 +2867,38 @@ sshpk@^1.7.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.3.1.tgz#faf51b9eb74aaef3b3acf4ad5f61abf24cb7b93e"
 
-stellar-base@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/stellar-base/-/stellar-base-1.0.2.tgz#081121e19f90a66becf741ce1f370d700c3ea2a6"
-  integrity sha512-L7w+wWPH+zjRzWXNwovl76oQozB7Gj+jZaqMIb4H+5i2ELnFd/7im9JTl/3PQ2iKffipz+X6Px6fxD6H8K/z7A==
+stellar-base@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/stellar-base/-/stellar-base-3.0.2.tgz#09083c8f2eb68eddb820504d3b19576da0632c31"
+  integrity sha512-ZZji4go8gRT932OTuUSggohWWuRIs11C99ShokoIurmWPwh0NsvkxN2cBxfEfQi/TdiO1/DiteCzz7w233AfXA==
   dependencies:
     base32.js "^0.1.0"
     bignumber.js "^4.0.0"
     crc "^3.5.0"
-    js-xdr "^1.1.1"
+    js-xdr "^1.1.3"
     lodash "^4.17.11"
     sha.js "^2.3.6"
     tweetnacl "^1.0.0"
   optionalDependencies:
     sodium-native "^2.3.0"
 
-stellar-sdk@2.0.0-rc.2:
-  version "2.0.0-rc.2"
-  resolved "https://registry.yarnpkg.com/stellar-sdk/-/stellar-sdk-2.0.0-rc.2.tgz#c40db8ac97f8e105302cebcb6d514656efe4d1a8"
-  integrity sha512-LjipZwxzfzY3BB8om9ASQTpyQceUgZCXkXkKBJqGfJnCRaBo3nVq8OdXLET9LFtkKe+X5b4xW4AozIs2LxcOvg==
+stellar-sdk@5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/stellar-sdk/-/stellar-sdk-5.0.0.tgz#c9cfd36ed9871142cc3ec9a9bbcd5efc834ec9c0"
+  integrity sha512-/D4OPnUnIXARkNwhnV9fFTBlDdulf/uAM/Gtb3l6T/0ERq8kiBbnI1GEKzlSNi1hWVAPulzpa9hw5NZWUdz4BQ==
   dependencies:
     "@types/eventsource" "^1.1.2"
     "@types/node" ">= 8"
-    "@types/urijs" "^1.19.2"
+    "@types/randombytes" "^2.0.0"
+    "@types/urijs" "^1.19.6"
     axios "^0.19.0"
     bignumber.js "^4.0.0"
     detect-node "^2.0.4"
     es6-promise "^4.2.4"
     eventsource "^1.0.7"
     lodash "^4.17.11"
-    stellar-base "^1.0.2"
+    randombytes "^2.1.0"
+    stellar-base "^3.0.0"
     toml "^2.3.0"
     tslib "^1.10.0"
     urijs "^1.19.1"