diff --git a/packages/stargate/src/modules/gov/messages.spec.ts b/packages/stargate/src/modules/gov/messages.spec.ts
index 2ee24b6d..d5a30f82 100644
--- a/packages/stargate/src/modules/gov/messages.spec.ts
+++ b/packages/stargate/src/modules/gov/messages.spec.ts
@@ -13,6 +13,7 @@ import {
   nonNegativeIntegerMatcher,
   pendingWithoutSimapp,
   simapp,
+  simapp50Enabled,
   simappEnabled,
   validator,
 } from "../../testutils.spec";
@@ -204,6 +205,7 @@ describe("gov messages", () => {
 
     it("works with Amino JSON sign mode", async () => {
       pendingWithoutSimapp();
+      if (simapp50Enabled()) pending("Not working, see https://github.com/cosmos/cosmos-sdk/issues/18546");
       assert(voterWalletAmino);
       assert(proposalId, "Missing proposal ID");
       const client = await SigningStargateClient.connectWithSigner(simapp.tendermintUrl, voterWalletAmino);
diff --git a/packages/stargate/src/modules/staking/messages.spec.ts b/packages/stargate/src/modules/staking/messages.spec.ts
index 5b8f5208..85f5d1ec 100644
--- a/packages/stargate/src/modules/staking/messages.spec.ts
+++ b/packages/stargate/src/modules/staking/messages.spec.ts
@@ -12,6 +12,7 @@ import {
   faucet,
   pendingWithoutSimapp,
   simapp,
+  simapp50Enabled,
 } from "../../testutils.spec";
 import { MsgCreateValidatorEncodeObject, MsgEditValidatorEncodeObject } from "./messages";
 
@@ -95,6 +96,7 @@ describe("staking messages", () => {
 
     it("works with Amino JSON sign mode", async () => {
       pendingWithoutSimapp();
+      if (simapp50Enabled()) pending("Not working, see https://github.com/cosmos/cosmos-sdk/issues/18546");
 
       const valWallet = await Secp256k1HdWallet.generate();
       const [valAccount] = await valWallet.getAccounts();
@@ -235,6 +237,7 @@ describe("staking messages", () => {
 
     it("works with Amino JSON sign mode", async () => {
       pendingWithoutSimapp();
+      if (simapp50Enabled()) pending("Not working, see https://github.com/cosmos/cosmos-sdk/issues/18546");
 
       const valWallet = await Secp256k1HdWallet.generate();
       const [valAccount] = await valWallet.getAccounts();