diff --git a/.circleci/config.yml b/.circleci/config.yml
index 194ee475..3243d286 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -88,11 +88,11 @@ jobs:
           background: true
       - run:
           name: Start simapp
-          command: ./scripts/simapp/start.sh
+          command: ./scripts/simapp42/start.sh
           background: true
       - run:
           name: Start slow simapp
-          command: ./scripts/simapp/slow_start.sh
+          command: ./scripts/simapp42/slow_start.sh
           background: true
       - run:
           name: Start Tendermint blockchains
@@ -176,8 +176,8 @@ jobs:
           command: |
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
-            ./scripts/simapp/stop.sh
-            ./scripts/simapp/slow_stop.sh
+            ./scripts/simapp42/stop.sh
+            ./scripts/simapp42/slow_stop.sh
             ./scripts/wasmd/stop.sh
             ./scripts/launchpad/stop.sh
   test-node-v14:
@@ -208,11 +208,11 @@ jobs:
           background: true
       - run:
           name: Start simapp
-          command: ./scripts/simapp/start.sh
+          command: ./scripts/simapp42/start.sh
           background: true
       - run:
           name: Start slow simapp
-          command: ./scripts/simapp/slow_start.sh
+          command: ./scripts/simapp42/slow_start.sh
           background: true
       - run:
           name: Start Tendermint blockchains
@@ -291,8 +291,8 @@ jobs:
           command: |
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
-            ./scripts/simapp/stop.sh
-            ./scripts/simapp/slow_stop.sh
+            ./scripts/simapp42/stop.sh
+            ./scripts/simapp42/slow_stop.sh
             ./scripts/wasmd/stop.sh
             ./scripts/launchpad/stop.sh
   test-chrome:
@@ -324,11 +324,11 @@ jobs:
           background: true
       - run:
           name: Start simapp
-          command: ./scripts/simapp/start.sh
+          command: ./scripts/simapp42/start.sh
           background: true
       - run:
           name: Start slow simapp
-          command: ./scripts/simapp/slow_start.sh
+          command: ./scripts/simapp42/slow_start.sh
           background: true
       - run:
           name: Start Tendermint blockchains
@@ -394,8 +394,8 @@ jobs:
           command: |
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
-            ./scripts/simapp/stop.sh
-            ./scripts/simapp/slow_stop.sh
+            ./scripts/simapp42/stop.sh
+            ./scripts/simapp42/slow_stop.sh
             ./scripts/wasmd/stop.sh
             ./scripts/launchpad/stop.sh
   coverage:
@@ -426,11 +426,11 @@ jobs:
           background: true
       - run:
           name: Start simapp
-          command: ./scripts/simapp/start.sh
+          command: ./scripts/simapp42/start.sh
           background: true
       - run:
           name: Start slow simapp
-          command: ./scripts/simapp/slow_start.sh
+          command: ./scripts/simapp42/slow_start.sh
           background: true
       - run:
           name: Start Tendermint blockchains
@@ -499,8 +499,8 @@ jobs:
           command: |
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
-            ./scripts/simapp/stop.sh
-            ./scripts/simapp/slow_stop.sh
+            ./scripts/simapp42/stop.sh
+            ./scripts/simapp42/slow_stop.sh
             ./scripts/wasmd/stop.sh
             ./scripts/launchpad/stop.sh
   docs-build:
diff --git a/packages/ledger-amino/README.md b/packages/ledger-amino/README.md
index b3adbbd7..5abdf3d4 100644
--- a/packages/ledger-amino/README.md
+++ b/packages/ledger-amino/README.md
@@ -58,7 +58,7 @@ transactions.
 ### Stargate tests
 
 Start a local Stargate blockchain as described in
-[scripts/simapp/README.md](https://github.com/cosmos/cosmjs/blob/main/scripts/simapp/README.md)
+[scripts/simapp42/README.md](https://github.com/cosmos/cosmjs/blob/main/scripts/simapp42/README.md)
 and execute:
 
 ```sh
diff --git a/packages/stargate/src/queries/ibctestdata.spec.ts b/packages/stargate/src/queries/ibctestdata.spec.ts
index 59a0f2ac..88a6aa07 100644
--- a/packages/stargate/src/queries/ibctestdata.spec.ts
+++ b/packages/stargate/src/queries/ibctestdata.spec.ts
@@ -17,7 +17,7 @@ import {
 } from "cosmjs-types/ibc/core/connection/v1/connection";
 import Long from "long";
 
-// From scripts/simapp/genesis-ibc.json
+// From scripts/simapp42/genesis-ibc.json
 
 export const portId = "transfer";
 export const channelId = "channel-0";
@@ -50,7 +50,7 @@ export const identifiedChannel = IdentifiedChannel.fromPartial({
 
 /**
  * ```
- * jq ".channel_genesis.commitments[0]" scripts/simapp/genesis-ibc.json
+ * jq ".channel_genesis.commitments[0]" scripts/simapp42/genesis-ibc.json
  * ```
  */
 export const commitment = {
@@ -69,7 +69,7 @@ export const packetState = PacketState.fromPartial({
  * Unfortunatly empty right now
  *
  * ```
- * jq ".channel_genesis.acknowledgements" scripts/simapp/genesis-ibc.json
+ * jq ".channel_genesis.acknowledgements" scripts/simapp42/genesis-ibc.json
  * ```
  */
 export const packetAcknowledgements: PacketState[] = [];
diff --git a/packages/stargate/src/testutils.spec.ts b/packages/stargate/src/testutils.spec.ts
index 510a99bd..a32c4e07 100644
--- a/packages/stargate/src/testutils.spec.ts
+++ b/packages/stargate/src/testutils.spec.ts
@@ -126,10 +126,10 @@ export const unused = {
 
 export const validator = {
   /**
-   * From first gentx's auth_info.signer_infos in scripts/simapp/template/.simapp/config/genesis.json
+   * From first gentx's auth_info.signer_infos in scripts/simapp42/template/.simapp/config/genesis.json
    *
    * ```
-   * jq ".app_state.genutil.gen_txs[0].auth_info.signer_infos[0].public_key" scripts/simapp/template/.simapp/config/genesis.json
+   * jq ".app_state.genutil.gen_txs[0].auth_info.signer_infos[0].public_key" scripts/simapp42/template/.simapp/config/genesis.json
    * ```
    */
   pubkey: {
@@ -137,18 +137,18 @@ export const validator = {
     value: "AtDcuH4cX1eaxZrJ5shheLG3tXPAoV4awoIZmNQtQxmf",
   },
   /**
-   * delegator_address from /cosmos.staking.v1beta1.MsgCreateValidator in scripts/simapp/template/.simapp/config/genesis.json
+   * delegator_address from /cosmos.staking.v1beta1.MsgCreateValidator in scripts/simapp42/template/.simapp/config/genesis.json
    *
    * ```
-   * jq ".app_state.genutil.gen_txs[0].body.messages[0].delegator_address" scripts/simapp/template/.simapp/config/genesis.json
+   * jq ".app_state.genutil.gen_txs[0].body.messages[0].delegator_address" scripts/simapp42/template/.simapp/config/genesis.json
    * ```
    */
   delegatorAddress: "cosmos1urk9gy7cfws0ak9x5nu7lx4un9n6gqkry79679",
   /**
-   * validator_address from /cosmos.staking.v1beta1.MsgCreateValidator in scripts/simapp/template/.simapp/config/genesis.json
+   * validator_address from /cosmos.staking.v1beta1.MsgCreateValidator in scripts/simapp42/template/.simapp/config/genesis.json
    *
    * ```
-   * jq ".app_state.genutil.gen_txs[0].body.messages[0].validator_address" scripts/simapp/template/.simapp/config/genesis.json
+   * jq ".app_state.genutil.gen_txs[0].body.messages[0].validator_address" scripts/simapp42/template/.simapp/config/genesis.json
    * ```
    */
   validatorAddress: "cosmosvaloper1urk9gy7cfws0ak9x5nu7lx4un9n6gqkrp230jk",
diff --git a/scripts/simapp/.gitignore b/scripts/simapp42/.gitignore
similarity index 100%
rename from scripts/simapp/.gitignore
rename to scripts/simapp42/.gitignore
diff --git a/scripts/simapp/README.md b/scripts/simapp42/README.md
similarity index 100%
rename from scripts/simapp/README.md
rename to scripts/simapp42/README.md
diff --git a/scripts/simapp/env b/scripts/simapp42/env
similarity index 100%
rename from scripts/simapp/env
rename to scripts/simapp42/env
diff --git a/scripts/simapp/generate_template.sh b/scripts/simapp42/generate_template.sh
similarity index 100%
rename from scripts/simapp/generate_template.sh
rename to scripts/simapp42/generate_template.sh
diff --git a/scripts/simapp/generate_template_slow.sh b/scripts/simapp42/generate_template_slow.sh
similarity index 100%
rename from scripts/simapp/generate_template_slow.sh
rename to scripts/simapp42/generate_template_slow.sh
diff --git a/scripts/simapp/genesis-ibc.json b/scripts/simapp42/genesis-ibc.json
similarity index 100%
rename from scripts/simapp/genesis-ibc.json
rename to scripts/simapp42/genesis-ibc.json
diff --git a/scripts/simapp/run_simd.sh b/scripts/simapp42/run_simd.sh
similarity index 100%
rename from scripts/simapp/run_simd.sh
rename to scripts/simapp42/run_simd.sh
diff --git a/scripts/simapp/setup.sh b/scripts/simapp42/setup.sh
similarity index 100%
rename from scripts/simapp/setup.sh
rename to scripts/simapp42/setup.sh
diff --git a/scripts/simapp/slow_start.sh b/scripts/simapp42/slow_start.sh
similarity index 100%
rename from scripts/simapp/slow_start.sh
rename to scripts/simapp42/slow_start.sh
diff --git a/scripts/simapp/slow_stop.sh b/scripts/simapp42/slow_stop.sh
similarity index 100%
rename from scripts/simapp/slow_stop.sh
rename to scripts/simapp42/slow_stop.sh
diff --git a/scripts/simapp/start.sh b/scripts/simapp42/start.sh
similarity index 100%
rename from scripts/simapp/start.sh
rename to scripts/simapp42/start.sh
diff --git a/scripts/simapp/stop.sh b/scripts/simapp42/stop.sh
similarity index 100%
rename from scripts/simapp/stop.sh
rename to scripts/simapp42/stop.sh
diff --git a/scripts/simapp/template/.simapp/config/app.toml b/scripts/simapp42/template/.simapp/config/app.toml
similarity index 100%
rename from scripts/simapp/template/.simapp/config/app.toml
rename to scripts/simapp42/template/.simapp/config/app.toml
diff --git a/scripts/simapp/template/.simapp/config/config.toml b/scripts/simapp42/template/.simapp/config/config.toml
similarity index 100%
rename from scripts/simapp/template/.simapp/config/config.toml
rename to scripts/simapp42/template/.simapp/config/config.toml
diff --git a/scripts/simapp/template/.simapp/config/genesis.json b/scripts/simapp42/template/.simapp/config/genesis.json
similarity index 100%
rename from scripts/simapp/template/.simapp/config/genesis.json
rename to scripts/simapp42/template/.simapp/config/genesis.json
diff --git a/scripts/simapp/template/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json b/scripts/simapp42/template/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
similarity index 100%
rename from scripts/simapp/template/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
rename to scripts/simapp42/template/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
diff --git a/scripts/simapp/template/.simapp/config/node_key.json b/scripts/simapp42/template/.simapp/config/node_key.json
similarity index 100%
rename from scripts/simapp/template/.simapp/config/node_key.json
rename to scripts/simapp42/template/.simapp/config/node_key.json
diff --git a/scripts/simapp/template/.simapp/config/priv_validator_key.json b/scripts/simapp42/template/.simapp/config/priv_validator_key.json
similarity index 100%
rename from scripts/simapp/template/.simapp/config/priv_validator_key.json
rename to scripts/simapp42/template/.simapp/config/priv_validator_key.json
diff --git a/scripts/simapp/template/.simapp/data/priv_validator_state.json b/scripts/simapp42/template/.simapp/data/priv_validator_state.json
similarity index 100%
rename from scripts/simapp/template/.simapp/data/priv_validator_state.json
rename to scripts/simapp42/template/.simapp/data/priv_validator_state.json
diff --git a/scripts/simapp/template/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address b/scripts/simapp42/template/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
similarity index 100%
rename from scripts/simapp/template/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
rename to scripts/simapp42/template/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
diff --git a/scripts/simapp/template/.simapp/keyhash b/scripts/simapp42/template/.simapp/keyhash
similarity index 100%
rename from scripts/simapp/template/.simapp/keyhash
rename to scripts/simapp42/template/.simapp/keyhash
diff --git a/scripts/simapp/template/.simapp/validator.info b/scripts/simapp42/template/.simapp/validator.info
similarity index 100%
rename from scripts/simapp/template/.simapp/validator.info
rename to scripts/simapp42/template/.simapp/validator.info
diff --git a/scripts/simapp/template/run_simd.sh b/scripts/simapp42/template/run_simd.sh
similarity index 100%
rename from scripts/simapp/template/run_simd.sh
rename to scripts/simapp42/template/run_simd.sh
diff --git a/scripts/simapp/template/setup.sh b/scripts/simapp42/template/setup.sh
similarity index 100%
rename from scripts/simapp/template/setup.sh
rename to scripts/simapp42/template/setup.sh
diff --git a/scripts/simapp/template_slow/.simapp/config/app.toml b/scripts/simapp42/template_slow/.simapp/config/app.toml
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/app.toml
rename to scripts/simapp42/template_slow/.simapp/config/app.toml
diff --git a/scripts/simapp/template_slow/.simapp/config/config.toml b/scripts/simapp42/template_slow/.simapp/config/config.toml
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/config.toml
rename to scripts/simapp42/template_slow/.simapp/config/config.toml
diff --git a/scripts/simapp/template_slow/.simapp/config/genesis.json b/scripts/simapp42/template_slow/.simapp/config/genesis.json
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/genesis.json
rename to scripts/simapp42/template_slow/.simapp/config/genesis.json
diff --git a/scripts/simapp/template_slow/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json b/scripts/simapp42/template_slow/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
rename to scripts/simapp42/template_slow/.simapp/config/gentx/gentx-ad7cdbcfe545eaaaea99378bc70bf22eef3401a4.json
diff --git a/scripts/simapp/template_slow/.simapp/config/node_key.json b/scripts/simapp42/template_slow/.simapp/config/node_key.json
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/node_key.json
rename to scripts/simapp42/template_slow/.simapp/config/node_key.json
diff --git a/scripts/simapp/template_slow/.simapp/config/priv_validator_key.json b/scripts/simapp42/template_slow/.simapp/config/priv_validator_key.json
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/config/priv_validator_key.json
rename to scripts/simapp42/template_slow/.simapp/config/priv_validator_key.json
diff --git a/scripts/simapp/template_slow/.simapp/data/priv_validator_state.json b/scripts/simapp42/template_slow/.simapp/data/priv_validator_state.json
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/data/priv_validator_state.json
rename to scripts/simapp42/template_slow/.simapp/data/priv_validator_state.json
diff --git a/scripts/simapp/template_slow/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address b/scripts/simapp42/template_slow/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
rename to scripts/simapp42/template_slow/.simapp/e0ec5413d84ba0fed8a6a4f9ef9abc9967a402c3.address
diff --git a/scripts/simapp/template_slow/.simapp/keyhash b/scripts/simapp42/template_slow/.simapp/keyhash
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/keyhash
rename to scripts/simapp42/template_slow/.simapp/keyhash
diff --git a/scripts/simapp/template_slow/.simapp/validator.info b/scripts/simapp42/template_slow/.simapp/validator.info
similarity index 100%
rename from scripts/simapp/template_slow/.simapp/validator.info
rename to scripts/simapp42/template_slow/.simapp/validator.info
diff --git a/scripts/simapp/template_slow/run_simd.sh b/scripts/simapp42/template_slow/run_simd.sh
similarity index 100%
rename from scripts/simapp/template_slow/run_simd.sh
rename to scripts/simapp42/template_slow/run_simd.sh
diff --git a/scripts/simapp/template_slow/setup.sh b/scripts/simapp42/template_slow/setup.sh
similarity index 100%
rename from scripts/simapp/template_slow/setup.sh
rename to scripts/simapp42/template_slow/setup.sh