diff --git a/Dockerfile b/Dockerfile
index f9744752..4c27f653 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,5 +16,5 @@ RUN npm install
 # Bundle app source
 
 EXPOSE 8080
-CMD [ "node", "./dist/index.js" ]
+CMD npm start
 
diff --git a/package-lock.json b/package-lock.json
index f08eb9eb..958a0679 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "yoroi-cardano-backend",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -31,9 +31,9 @@
       }
     },
     "@emurgo/cardano-serialization-lib-nodejs": {
-      "version": "9.1.0",
-      "resolved": "https://registry.npmjs.org/@emurgo/cardano-serialization-lib-nodejs/-/cardano-serialization-lib-nodejs-9.1.0.tgz",
-      "integrity": "sha512-4gW+KqejTSm/rkNwWxK/WUJvlifWqFx5ShgCtWmPuTZ/YJAZSpROI8DP+pqTakG0gGWdxPB3BnVJIPrczNwmtA=="
+      "version": "9.1.3",
+      "resolved": "https://registry.npmjs.org/@emurgo/cardano-serialization-lib-nodejs/-/cardano-serialization-lib-nodejs-9.1.3.tgz",
+      "integrity": "sha512-oFfWfGZ8HBpDKpK+/UsSqkMbVLSEYSJuWdvzVcziqBJ3FRM3MK2vd9P8woMkRP5WjC2LsnKpC9f+fgrogtlApA=="
     },
     "@eslint/eslintrc": {
       "version": "0.2.1",
@@ -3677,7 +3677,8 @@
     "prettier": {
       "version": "2.5.1",
       "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.5.1.tgz",
-      "integrity": "sha512-vBZcPRUR5MZJwoyi3ZoyQlc1rXeEck8KgeC9AwwOn+exuxLxq5toTRDTSaVrXHxelDMHy9zlicw8u66yxoSUFg=="
+      "integrity": "sha512-vBZcPRUR5MZJwoyi3ZoyQlc1rXeEck8KgeC9AwwOn+exuxLxq5toTRDTSaVrXHxelDMHy9zlicw8u66yxoSUFg==",
+      "dev": true
     },
     "process-nextick-args": {
       "version": "2.0.1",
diff --git a/package.json b/package.json
index 14f418e5..be9f8273 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "yoroi-cardano-backend",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "description": "Wrapped for cardano-db-sync and cardano-graphql with endpoints useful for light wallets",
   "main": "src/index.ts",
   "scripts": {
@@ -22,8 +22,8 @@
     }
   },
   "dependencies": {
-    "@emurgo/cardano-serialization-lib-nodejs": "^9.1.0",
     "aws-sdk": "^2.1056.0",
+    "@emurgo/cardano-serialization-lib-nodejs": "9.1.3",
     "axios": "^0.21.1",
     "bech32": "^1.1.4",
     "bunyan": "^1.8.15",
@@ -38,7 +38,6 @@
     "mocha": "^8.2.0",
     "pg": "^8.4.2",
     "pm2": "^4.5.0",
-    "prettier": "^2.5.1",
     "semver-compare": "^1.0.0",
     "ts-node": "^9.0.0",
     "tsc-watch": "^4.2.9",
@@ -65,6 +64,7 @@
     "eslint-config-airbnb-typescript": "^9.0.0",
     "eslint-plugin-import": "^2.22.1",
     "husky": "^4.3.0",
+    "prettier": "^2.5.1",
     "ramda": "^0.27.1"
   },
   "engines": {
diff --git a/src/services/signedTransaction.ts b/src/services/signedTransaction.ts
index 1f30eace..26aadd9a 100644
--- a/src/services/signedTransaction.ts
+++ b/src/services/signedTransaction.ts
@@ -6,11 +6,12 @@ import { calculateTxId } from "../utils";
 const submissionEndpoint: string = config.get("server.txSubmissionEndpoint");
 
 // THIS IS FOR CARDANO-WALLET, CBOR IS FOR CARDANO-SUBMIT-API (1.27.0).
-const contentType = config.get("usingQueueEndpoint") === "true"
-  ? "application/json"
-  : `application/${process.env.TX_SUBMIT_CONTENT_TYPE || "octet-stream"}`;
+const contentType =
+  config.get("usingQueueEndpoint") === "true"
+    ? "application/json"
+    : `application/${process.env.TX_SUBMIT_CONTENT_TYPE || "octet-stream"}`;
 const contentTypeHeaders = {
-  "Content-Type": contentType
+  "Content-Type": contentType,
 };
 // const contentTypeHeaders = {"Content-Type": "application/cbor"};
 
@@ -22,15 +23,15 @@ const submitToQueue = async (req: Request, res: Response) => {
     const signedTxQueueEndpoint = config.get("server.signedTxQueueEndpoint");
 
     await axios({
-      method: "post"
-      , url: `${signedTxQueueEndpoint}api/submit/tx`
-      , data: {
+      method: "post",
+      url: `${signedTxQueueEndpoint}api/submit/tx`,
+      data: {
         txId: txId,
-        signedTx: buffer.toString("base64")
-      }
-      , headers: contentTypeHeaders
+        signedTx: buffer.toString("base64"),
+      },
+      headers: contentTypeHeaders,
     });
-    res.status(200).send({txId});
+    res.status(200).send({ txId });
   } catch (err) {
     console.error(err);
     res.status(500).send("Error submitting the TX");
@@ -42,29 +43,36 @@ const submit = async (req: Request, res: Response) => {
   const LOGGING_MSG_HOLDER: [any, any] = [null, null];
   try {
     const endpointResponse: any = await axios({
-      method: "post"
-      , url: submissionEndpoint
-      , data: buffer
-      , headers: contentTypeHeaders
-    }).then(r => {
-      try {
-        const {status, statusText, data} = r || {};
-        LOGGING_MSG_HOLDER[0] = `FULL: ${JSON.stringify({status, statusText, data})}`;
-      } catch (e) {
+      method: "post",
+      url: submissionEndpoint,
+      data: buffer,
+      headers: contentTypeHeaders,
+    }).then(
+      (r) => {
         try {
-          LOGGING_MSG_HOLDER[0] = `FULL_ERR: ${r} | ${e}`;
-        } catch (ee) {
-          LOGGING_MSG_HOLDER[0] = `FULL_ERR_ERR: ${ee}`;
+          const { status, statusText, data } = r || {};
+          LOGGING_MSG_HOLDER[0] = `FULL: ${JSON.stringify({
+            status,
+            statusText,
+            data,
+          })}`;
+        } catch (e) {
+          try {
+            LOGGING_MSG_HOLDER[0] = `FULL_ERR: ${r} | ${e}`;
+          } catch (ee) {
+            LOGGING_MSG_HOLDER[0] = `FULL_ERR_ERR: ${ee}`;
+          }
+        }
+        return r;
+      },
+      (err) => {
+        try {
+          LOGGING_MSG_HOLDER[1] = `ERR: ${JSON.stringify(err)}`;
+        } catch (e) {
+          LOGGING_MSG_HOLDER[1] = `ERR_ERR: ${err}`;
         }
       }
-      return r;
-    }, err => {
-      try {
-        LOGGING_MSG_HOLDER[1] = `ERR: ${JSON.stringify(err)}`;
-      } catch (e) {
-        LOGGING_MSG_HOLDER[1] = `ERR_ERR: ${err}`;
-      }
-    });
+    );
     if (endpointResponse?.status === 202) {
       if (endpointResponse.data.Left) {
         const msg = `Transaction was rejected: ${endpointResponse.data.Left}`;
@@ -74,23 +82,31 @@ const submit = async (req: Request, res: Response) => {
       res.send([]);
       return;
     } else {
-      const {status, statusText, data} = endpointResponse || {};
-      throw Error(`I did not understand the response from the submission endpoint: ${JSON.stringify({
-        status,
-        statusText,
-        data,
-        err: LOGGING_MSG_HOLDER[1],
-      })}`);
+      const { status, statusText, data } = endpointResponse || {};
+      throw Error(
+        `I did not understand the response from the submission endpoint: ${JSON.stringify(
+          {
+            status,
+            statusText,
+            data,
+            err: LOGGING_MSG_HOLDER[1],
+          }
+        )}`
+      );
     }
   } catch (error: any) {
-    const msg = `Error trying to send transaction: ${error} - ${JSON.stringify(LOGGING_MSG_HOLDER)}`;
+    const msg = `Error trying to send transaction: ${error} - ${JSON.stringify(
+      LOGGING_MSG_HOLDER
+    )}`;
     throw Error(msg);
   }
 };
 
-export const handleSignedTx = async (req: Request, res: Response): Promise<void> => {
-  if (!req.body.signedTx)
-    throw new Error("No signedTx in body");
+export const handleSignedTx = async (
+  req: Request,
+  res: Response
+): Promise<void> => {
+  if (!req.body.signedTx) throw new Error("No signedTx in body");
 
   if (config.get("usingQueueEndpoint") === "true") {
     await submitToQueue(req, res);
diff --git a/src/services/txStatus.ts b/src/services/txStatus.ts
index 4d4a7bc1..c6216f0f 100644
--- a/src/services/txStatus.ts
+++ b/src/services/txStatus.ts
@@ -32,34 +32,34 @@ export const handleTxStatus =
 
     const result = await pool.query(txStatusQuery, [txHashes]);
 
-  const response: any = {};
-  const depth: {[key: string]: number} = {};
+    const response: any = {};
+    const depth: { [key: string]: number } = {};
 
     for (const item of result.rows) {
       depth[item.tx_id] = item.depth;
     }
 
-  response.depth = depth;
+    response.depth = depth;
 
-  if (config.get("usingQueueEndpoint") === "true") {
-    try {
-      const result = await axios({
-        method: "post",
-        url: `${signedTxQueueEndpoint}api/getTxsStatus`,
-        data: {
-          txHashes: txHashes
-        }
-      });
+    if (config.get("usingQueueEndpoint") === "true") {
+      try {
+        const result = await axios({
+          method: "post",
+          url: `${signedTxQueueEndpoint}api/getTxsStatus`,
+          data: {
+            txHashes: txHashes,
+          },
+        });
 
-      const submissionStatus: {[key: string]: string} = {};
-      for (const status of result.data) {
-        submissionStatus[status.id] = status.status;
+        const submissionStatus: { [key: string]: string } = {};
+        for (const status of result.data) {
+          submissionStatus[status.id] = status.status;
+        }
+        response.submissionStatus = submissionStatus;
+      } finally {
+        // ignore errors
       }
-      response.submissionStatus = submissionStatus;
-    } finally {
-      // ignore errors
     }
-  }
 
-  res.send(response);
-};
\ No newline at end of file
+    res.send(response);
+  };
diff --git a/src/utils/mappers.ts b/src/utils/mappers.ts
index 22dd74b8..2130b1a6 100644
--- a/src/utils/mappers.ts
+++ b/src/utils/mappers.ts
@@ -15,6 +15,7 @@ import {
   GeneralTransactionMetadata,
   TransactionMetadatum,
   BigNum,
+  MetadataMap,
 } from "@emurgo/cardano-serialization-lib-nodejs";
 
 const MAX_INT = "2147483647";
@@ -133,14 +134,25 @@ function buildMetadataObj(
     const keyWasm = BigNum.from_str(key);
     // the cbor inserted into SQL is not the full metadata for the transaction
     // instead, each row is a CBOR map with a single entry <transaction_metadatum_label, transaction_metadatum>
-    const singletonMap = TransactionMetadatum.from_bytes(
-      Buffer.from(
-        // need to cutoff the \\x prefix added by SQL
-        metadataMap[key].substring(2),
-        "hex"
-      )
-    );
-    const map = singletonMap.as_map();
+    let singletonMap;
+    let map;
+    try {
+      singletonMap = TransactionMetadatum.from_bytes(
+        Buffer.from(
+          // need to cutoff the \\x prefix added by SQL
+          metadataMap[key].substring(2),
+          "hex"
+        )
+      );
+      map = singletonMap.as_map();
+    } catch {
+      map = MetadataMap.new();
+      map.insert_str(
+        "error",
+        TransactionMetadatum.new_text("failed to deserialize")
+      );
+    }
+
     const keys = map.keys();
     for (let i = 0; i < keys.len(); i++) {
       const cborKey = keys.get(i);
@@ -150,7 +162,9 @@ function buildMetadataObj(
       cborKey.free();
     }
     keyWasm.free();
-    singletonMap.free();
+    if (singletonMap) {
+      singletonMap.free();
+    }
     map.free();
     keys.free();
   }