diff --git a/packages/sdk/src/cosmwasmclient.spec.ts b/packages/sdk/src/cosmwasmclient.spec.ts
index 6050d99c..7e2ddb80 100644
--- a/packages/sdk/src/cosmwasmclient.spec.ts
+++ b/packages/sdk/src/cosmwasmclient.spec.ts
@@ -13,7 +13,7 @@ import cosmoshub from "./testdata/cosmoshub.json";
 import {
   deployedErc20,
   faucet,
-  getRandomizedHackatom,
+  getHackatom,
   makeRandomAddress,
   pendingWithoutWasmd,
   tendermintIdMatcher,
@@ -376,7 +376,7 @@ describe("CosmWasmClient", () => {
         const client = new SigningCosmWasmClient(wasmd.endpoint, faucet.address, signBytes =>
           pen.sign(signBytes),
         );
-        const { codeId } = await client.upload(getRandomizedHackatom());
+        const { codeId } = await client.upload(getHackatom());
         const initMsg = { verifier: makeRandomAddress(), beneficiary: makeRandomAddress() };
         const { contractAddress } = await client.instantiate(codeId, initMsg, "random hackatom");
         contract = { initMsg: initMsg, address: contractAddress };
@@ -429,7 +429,7 @@ describe("CosmWasmClient", () => {
         const client = new SigningCosmWasmClient(wasmd.endpoint, faucet.address, signBytes =>
           pen.sign(signBytes),
         );
-        const { codeId } = await client.upload(getRandomizedHackatom());
+        const { codeId } = await client.upload(getHackatom());
         const initMsg = { verifier: makeRandomAddress(), beneficiary: makeRandomAddress() };
         const { contractAddress } = await client.instantiate(codeId, initMsg, "a different hackatom");
         contract = { initMsg: initMsg, address: contractAddress };
diff --git a/packages/sdk/src/restclient.spec.ts b/packages/sdk/src/restclient.spec.ts
index f5a96f91..194a5204 100644
--- a/packages/sdk/src/restclient.spec.ts
+++ b/packages/sdk/src/restclient.spec.ts
@@ -16,7 +16,7 @@ import {
   deployedErc20,
   faucet,
   fromOneElementArray,
-  getRandomizedHackatom,
+  getHackatom,
   makeRandomAddress,
   pendingWithoutWasmd,
   semverMatcher,
@@ -92,7 +92,7 @@ async function uploadCustomContract(
 }
 
 async function uploadContract(client: RestClient, pen: Pen): Promise<PostTxsResponse> {
-  return uploadCustomContract(client, pen, getRandomizedHackatom());
+  return uploadCustomContract(client, pen, getHackatom());
 }
 
 async function instantiateContract(
@@ -738,7 +738,7 @@ describe("RestClient", () => {
       const numExisting = existingInfos.length;
 
       // upload data
-      const wasmCode = getRandomizedHackatom();
+      const wasmCode = getHackatom();
       const result = await uploadCustomContract(client, pen, wasmCode);
       expect(result.code).toBeFalsy();
       const logs = parseLogs(result.logs);
diff --git a/packages/sdk/src/signingcosmwasmclient.spec.ts b/packages/sdk/src/signingcosmwasmclient.spec.ts
index 28730f8a..0eaa522c 100644
--- a/packages/sdk/src/signingcosmwasmclient.spec.ts
+++ b/packages/sdk/src/signingcosmwasmclient.spec.ts
@@ -6,7 +6,7 @@ import { PrivateCosmWasmClient } from "./cosmwasmclient";
 import { Secp256k1Pen } from "./pen";
 import { RestClient } from "./restclient";
 import { SigningCosmWasmClient, UploadMeta } from "./signingcosmwasmclient";
-import { getRandomizedHackatom, makeRandomAddress, pendingWithoutWasmd } from "./testutils.spec";
+import { getHackatom, makeRandomAddress, pendingWithoutWasmd } from "./testutils.spec";
 import { Coin } from "./types";
 
 const { toHex } = Encoding;
@@ -55,7 +55,7 @@ describe("SigningCosmWasmClient", () => {
       pendingWithoutWasmd();
       const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
       const client = new SigningCosmWasmClient(httpUrl, faucet.address, signBytes => pen.sign(signBytes));
-      const wasm = getRandomizedHackatom();
+      const wasm = getHackatom();
       const {
         codeId,
         originalChecksum,
@@ -74,7 +74,7 @@ describe("SigningCosmWasmClient", () => {
       pendingWithoutWasmd();
       const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
       const client = new SigningCosmWasmClient(httpUrl, faucet.address, signBytes => pen.sign(signBytes));
-      const wasm = getRandomizedHackatom();
+      const wasm = getHackatom();
 
       const meta: UploadMeta = {
         source: "https://crates.io/api/v1/crates/cw-nameservice/0.1.0/download",
@@ -93,7 +93,7 @@ describe("SigningCosmWasmClient", () => {
       pendingWithoutWasmd();
       const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
       const client = new SigningCosmWasmClient(httpUrl, faucet.address, signBytes => pen.sign(signBytes));
-      const { codeId } = await client.upload(getRandomizedHackatom());
+      const { codeId } = await client.upload(getHackatom());
 
       const transferAmount: readonly Coin[] = [
         {
@@ -126,7 +126,7 @@ describe("SigningCosmWasmClient", () => {
       pendingWithoutWasmd();
       const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
       const client = new SigningCosmWasmClient(httpUrl, faucet.address, signBytes => pen.sign(signBytes));
-      const { codeId } = await client.upload(getRandomizedHackatom());
+      const { codeId } = await client.upload(getHackatom());
 
       const contractAddress1 = await client.instantiate(
         codeId,
@@ -153,7 +153,7 @@ describe("SigningCosmWasmClient", () => {
       pendingWithoutWasmd();
       const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
       const client = new SigningCosmWasmClient(httpUrl, faucet.address, signBytes => pen.sign(signBytes));
-      const { codeId } = await client.upload(getRandomizedHackatom());
+      const { codeId } = await client.upload(getHackatom());
 
       // instantiate
       const transferAmount: readonly Coin[] = [
diff --git a/packages/sdk/src/testutils.spec.ts b/packages/sdk/src/testutils.spec.ts
index be72bc0f..e3bd6188 100644
--- a/packages/sdk/src/testutils.spec.ts
+++ b/packages/sdk/src/testutils.spec.ts
@@ -25,31 +25,8 @@ export function leb128Encode(uint: number): Uint8Array {
   return new Uint8Array(out);
 }
 
-export function getRandomizedHackatom(): Uint8Array {
-  const data = Encoding.fromBase64(hackatom.data);
-
-  // The return value of the export function cosmwasm_api_0_6 is unused and
-  // can be randomized for testing.
-  //
-  // Find position of mutable bytes as follows:
-  // $ wasm-objdump -d contract.wasm | grep -F "cosmwasm_api_0_6" -A 1
-  // 0136d2 func[198] <cosmwasm_api_0_6>:
-  //  0136d3: 41 83 0c                   | i32.const 1539
-  //
-  // In the last line, the addresses [0136d3, 0136d3+1, 0136d3+2] hold a one byte instruction
-  // and a two byte value (leb128 encoded 1539). See also
-  // https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md#constants-described-here.
-
-  // Any unsigned integer from 128 to 16383 is encoded to two leb128 bytes
-  const min = 128;
-  const max = 16383;
-  const random = Math.floor(Math.random() * (max - min)) + min;
-  const bytes = leb128Encode(random);
-
-  data[0x0136d3 + 1] = bytes[0];
-  data[0x0136d3 + 2] = bytes[1];
-
-  return data;
+export function getHackatom(): Uint8Array {
+  return Encoding.fromBase64(hackatom.data);
 }
 
 export function makeRandomAddress(): string {