diff --git a/package.json b/package.json
index d55c6d2..a9b62b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zkbob-client-js",
-  "version": "5.5.0",
+  "version": "5.5.1",
   "description": "zkBob integration library",
   "repository": "git@github.com:zkBob/libzkbob-client-js.git",
   "author": "Dmitry Vdovin <voidxnull@gmail.com>",
@@ -37,8 +37,7 @@
     "tronweb": "^5.3.0",
     "wasm-feature-detect": "^1.2.11",
     "web3": "1.8.0",
-    "web3-utils": "1.8.0",
-    "promise-retry": "^2.0.1"
+    "web3-utils": "1.8.0"
   },
   "devDependencies": {
     "@types/ethereum-protocol": "^1.0.1",
diff --git a/src/client-provider.ts b/src/client-provider.ts
index 73226d9..5a39642 100644
--- a/src/client-provider.ts
+++ b/src/client-provider.ts
@@ -379,14 +379,14 @@ export class ZkBobProvider {
 
     // Convert native pool amount to the base units
     public async shieldedAmountToWei(amountShielded: bigint): Promise<bigint> {
-        const denominator = await this.denominator();
-        return denominator > 0 ? amountShielded * denominator : amountShielded / (-denominator);
+        const denominator = BigInt(await this.denominator());
+        return denominator > 0 ? BigInt(amountShielded) * denominator : BigInt(amountShielded) / (-denominator);
     }
     
     // Convert base units to the native pool amount
     public async weiToShieldedAmount(amountWei: bigint): Promise<bigint> {
-        const denominator = await this.denominator();
-        return denominator > 0 ? amountWei / denominator : amountWei * (-denominator);
+        const denominator = BigInt(await this.denominator());
+        return denominator > 0 ? BigInt(amountWei) / denominator : BigInt(amountWei) * (-denominator);
     }
 
     // Round up the fee if needed with fixed fee decimal places (after point)
diff --git a/src/networks/rpcman.ts b/src/networks/rpcman.ts
index 565844a..57e1537 100644
--- a/src/networks/rpcman.ts
+++ b/src/networks/rpcman.ts
@@ -1,5 +1,4 @@
 import { InternalError } from "../errors";
-import promiseRetry from 'promise-retry';
 
 const RPC_ISSUES_THRESHOLD = 20;    // number of errors needed to switch RPC
 
@@ -26,23 +25,27 @@ export class MultiRpcManager {
     }
 
     // Performs RPC interaction within several attempts. The errors will registered automatically
-    protected commonRpcRetry(closure: () => any, errorPattern: string, retriesCnt: number): Promise<any> {
-        return promiseRetry(
-            async (retry, attempt) => {
-              try {
-                  return await closure();
-              } catch (e) {
-                  console.error(`${errorPattern ?? 'Error occured'} [attempt #${attempt}]: ${e.message}`);
-                  this.registerRpcIssue();
-                  retry(e)
-              }
-            },
-            {
-              retries: retriesCnt,
-              minTimeout: 500,
-              maxTimeout: 500,
+    protected async commonRpcRetry(closure: () => any, errorPattern: string, retriesCnt: number): Promise<any> {
+        let cnt = 0;
+        const attemptMinDelayMs = 500;
+        let lastErr;
+        do {
+            const startTs = Date.now();
+            try {
+                return await closure();
+            } catch (e) {
+                lastErr = e;
+                console.error(`${errorPattern ?? 'Error occured'} [attempt #${cnt + 1}]: ${e.message}`);
+                this.registerRpcIssue();
+
+                const delay = Date.now() - startTs;
+                if (delay < attemptMinDelayMs) {
+                    await new Promise(f => setTimeout(f, attemptMinDelayMs - delay));
+                }
             }
-        );
+        } while (++cnt < retriesCnt);
+        
+        throw new InternalError(`MultRpcManager: ${lastErr.message}`)
     }
 
     // ----------------------=========< RPC switching >=========----------------------