diff --git a/packages/stargate/src/stargateclient.ts b/packages/stargate/src/stargateclient.ts
index 2891999a..83004e8f 100644
--- a/packages/stargate/src/stargateclient.ts
+++ b/packages/stargate/src/stargateclient.ts
@@ -284,7 +284,7 @@ export class StargateClient {
     timeoutMs = 60_000,
     pollIntervalMs = 3_000,
   ): Promise<BroadcastTxResponse> {
-    const txId = toHex(sha256(tx));
+    const txId = toHex(sha256(tx)).toUpperCase();
     let timedOut = false;
     const txPollTimeout = setTimeout(() => {
       timedOut = true;
diff --git a/packages/stargate/src/testutils.spec.ts b/packages/stargate/src/testutils.spec.ts
index 3a23683e..8c562d5f 100644
--- a/packages/stargate/src/testutils.spec.ts
+++ b/packages/stargate/src/testutils.spec.ts
@@ -71,7 +71,7 @@ export const slowSimapp = {
   chainId: "simd-testing",
   denomStaking: "ustake",
   denomFee: "ucosm",
-  blockTime: 1_000, // ms
+  blockTime: 10_000, // ms
   totalSupply: 21000000000,
 };