diff --git a/eslint.config.mjs b/eslint.config.mjs
index 7fc2542..2085ac4 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -18,14 +18,15 @@ export default tseslint.config(
     },
     rules: {
       '@typescript-eslint/no-namespace': 'off',
-      '@typescript-eslint/unbound-method': 'off',
+      '@typescript-eslint/unbound-method': [
+        "error",
+        {
+          "ignoreStatic": true
+        }
+      ],
       '@typescript-eslint/no-explicit-any': 'off',
       '@typescript-eslint/no-unsafe-assignment': 'off',
-      '@typescript-eslint/no-unsafe-member-access': 'off',
-      '@typescript-eslint/no-unsafe-argument': 'off',
       '@typescript-eslint/no-unsafe-return': 'off',
-      '@typescript-eslint/no-unsafe-call': 'off',
-      '@typescript-eslint/require-await': 'off',
     }
   },
   {
diff --git a/package-lock.json b/package-lock.json
index 67f9cc7..c321d15 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -30,7 +30,6 @@
       },
       "devDependencies": {
         "@eslint/js": "^9.5.0",
-        "@initia/builder.js": "^0.1.6",
         "@types/bn.js": "^5.1.1",
         "@types/eslint": "^8.56.10",
         "@types/eslint__js": "^8.42.3",
@@ -886,20 +885,6 @@
         "google-protobuf": "^3.14.0"
       }
     },
-    "node_modules/@initia/builder.js": {
-      "version": "0.1.6",
-      "resolved": "https://registry.npmjs.org/@initia/builder.js/-/builder.js-0.1.6.tgz",
-      "integrity": "sha512-R9akwSaIQMkLdKS4n6PoM6QMvywdqe1qQYWT1igFJhlmDJGWk8vryLhhsEL3VwkpGzFM6qDd2Ps5/BqgyXLXqA==",
-      "dev": true,
-      "dependencies": {
-        "ffi-napi": "^4.0.3",
-        "ref-napi": "^3.0.3",
-        "ref-struct-di": "^1.1.1"
-      },
-      "engines": {
-        "node": ">=14"
-      }
-    },
     "node_modules/@initia/initia.proto": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/@initia/initia.proto/-/initia.proto-0.2.1.tgz",
@@ -4334,30 +4319,6 @@
         "bser": "2.1.1"
       }
     },
-    "node_modules/ffi-napi": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/ffi-napi/-/ffi-napi-4.0.3.tgz",
-      "integrity": "sha512-PMdLCIvDY9mS32RxZ0XGb95sonPRal8aqRhLbeEtWKZTe2A87qRFG9HjOhvG8EX2UmQw5XNRMIOT+1MYlWmdeg==",
-      "dev": true,
-      "hasInstallScript": true,
-      "dependencies": {
-        "debug": "^4.1.1",
-        "get-uv-event-loop-napi-h": "^1.0.5",
-        "node-addon-api": "^3.0.0",
-        "node-gyp-build": "^4.2.1",
-        "ref-napi": "^2.0.1 || ^3.0.2",
-        "ref-struct-di": "^1.1.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "node_modules/ffi-napi/node_modules/node-addon-api": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-3.2.1.tgz",
-      "integrity": "sha512-mmcei9JghVNDYydghQmeDX8KoAm0FAiYyIcUt/N4nhyAipB17pllZQDOJD2fotxABnt4Mdz+dKTO7eftLg4d0A==",
-      "dev": true
-    },
     "node_modules/file-entry-cache": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-6.0.1.tgz",
@@ -4596,21 +4557,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/get-symbol-from-current-process-h": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/get-symbol-from-current-process-h/-/get-symbol-from-current-process-h-1.0.2.tgz",
-      "integrity": "sha512-syloC6fsCt62ELLrr1VKBM1ggOpMdetX9hTrdW77UQdcApPHLmf7CI7OKcN1c9kYuNxKcDe4iJ4FY9sX3aw2xw==",
-      "dev": true
-    },
-    "node_modules/get-uv-event-loop-napi-h": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/get-uv-event-loop-napi-h/-/get-uv-event-loop-napi-h-1.0.6.tgz",
-      "integrity": "sha512-t5c9VNR84nRoF+eLiz6wFrEp1SE2Acg0wS+Ysa2zF0eROes+LzOfuTaVHxGy8AbS8rq7FHEJzjnCZo1BupwdJg==",
-      "dev": true,
-      "dependencies": {
-        "get-symbol-from-current-process-h": "^1.0.1"
-      }
-    },
     "node_modules/glob": {
       "version": "7.2.3",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
@@ -7359,46 +7305,6 @@
         "node": ">= 0.10"
       }
     },
-    "node_modules/ref-napi": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/ref-napi/-/ref-napi-3.0.3.tgz",
-      "integrity": "sha512-LiMq/XDGcgodTYOMppikEtJelWsKQERbLQsYm0IOOnzhwE9xYZC7x8txNnFC9wJNOkPferQI4vD4ZkC0mDyrOA==",
-      "dev": true,
-      "hasInstallScript": true,
-      "dependencies": {
-        "debug": "^4.1.1",
-        "get-symbol-from-current-process-h": "^1.0.2",
-        "node-addon-api": "^3.0.0",
-        "node-gyp-build": "^4.2.1"
-      },
-      "engines": {
-        "node": ">= 10.0"
-      }
-    },
-    "node_modules/ref-napi/node_modules/node-addon-api": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-3.2.1.tgz",
-      "integrity": "sha512-mmcei9JghVNDYydghQmeDX8KoAm0FAiYyIcUt/N4nhyAipB17pllZQDOJD2fotxABnt4Mdz+dKTO7eftLg4d0A==",
-      "dev": true
-    },
-    "node_modules/ref-struct-di": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/ref-struct-di/-/ref-struct-di-1.1.1.tgz",
-      "integrity": "sha512-2Xyn/0Qgz89VT+++WP0sTosdm9oeowLP23wRJYhG4BFdMUrLj3jhwHZNEytYNYgtPKLNTP3KJX4HEgBvM1/Y2g==",
-      "dev": true,
-      "dependencies": {
-        "debug": "^3.1.0"
-      }
-    },
-    "node_modules/ref-struct-di/node_modules/debug": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
-      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
-      "dev": true,
-      "dependencies": {
-        "ms": "^2.1.1"
-      }
-    },
     "node_modules/regexp.prototype.flags": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/regexp.prototype.flags/-/regexp.prototype.flags-1.5.2.tgz",
diff --git a/package.json b/package.json
index 18d0aff..c89656b 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,6 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.5.0",
-    "@initia/builder.js": "^0.1.6",
     "@types/bn.js": "^5.1.1",
     "@types/eslint": "^8.56.10",
     "@types/eslint__js": "^8.42.3",
diff --git a/src/client/WebSocketClient.ts b/src/client/WebSocketClient.ts
index 34e2400..a1c4b5c 100644
--- a/src/client/WebSocketClient.ts
+++ b/src/client/WebSocketClient.ts
@@ -202,11 +202,11 @@ export class WebSocketClient extends EventEmitter {
 
       if (
         this.callback &&
-        parsedData.result &&
-        parsedData.result.query === this.queryParams
+        parsedData.result && // eslint-disable-line @typescript-eslint/no-unsafe-member-access
+        parsedData.result.query === this.queryParams // eslint-disable-line @typescript-eslint/no-unsafe-member-access
       ) {
         // this.emit('message', parsedData.result.data);
-        this.callback(parsedData.result.data)
+        this.callback(parsedData.result.data) // eslint-disable-line @typescript-eslint/no-unsafe-argument, @typescript-eslint/no-unsafe-member-access
       }
     } catch (err) {
       this.emit('error', err)
@@ -248,7 +248,7 @@ export class WebSocketClient extends EventEmitter {
 
   public subscribeTx(query: TendermintQuery, callback: Callback): void {
     const newCallback: Callback = (d) => {
-      d.value.TxResult.txhash = hashToHex(d.value.TxResult.tx)
+      d.value.TxResult.txhash = hashToHex(d.value.TxResult.tx as string) // eslint-disable-line @typescript-eslint/no-unsafe-member-access
       return callback(d)
     }
 
diff --git a/src/client/lcd/api/TxAPI.ts b/src/client/lcd/api/TxAPI.ts
index 50bfcc1..d3f2e51 100644
--- a/src/client/lcd/api/TxAPI.ts
+++ b/src/client/lcd/api/TxAPI.ts
@@ -479,11 +479,11 @@ export class TxAPI extends BaseAPI {
       }
 
       if (d.code) {
-        blockResult.code = d.code
+        blockResult.code = d.code // eslint-disable-line @typescript-eslint/no-unsafe-member-access
       }
 
       if (d.codespace) {
-        blockResult.codespace = d.codespace
+        blockResult.codespace = d.codespace // eslint-disable-line @typescript-eslint/no-unsafe-member-access
       }
 
       return blockResult
diff --git a/src/core/authz/msgs/MsgExecAuthorized.ts b/src/core/authz/msgs/MsgExecAuthorized.ts
index efe9bed..e29561b 100644
--- a/src/core/authz/msgs/MsgExecAuthorized.ts
+++ b/src/core/authz/msgs/MsgExecAuthorized.ts
@@ -36,7 +36,7 @@ export class MsgExecAuthorized extends JSONSerializable<
       type: 'cosmos-sdk/MsgExec',
       value: {
         grantee,
-        msgs: msgs.map((msg) => {
+        msgs: msgs.map((msg): Msg.Amino => {
           return msg.toAmino()
         }),
       },
diff --git a/src/core/gov/msgs/MsgSubmitProposal.ts b/src/core/gov/msgs/MsgSubmitProposal.ts
index b3b5c25..478adfc 100644
--- a/src/core/gov/msgs/MsgSubmitProposal.ts
+++ b/src/core/gov/msgs/MsgSubmitProposal.ts
@@ -72,7 +72,7 @@ export class MsgSubmitProposal extends JSONSerializable<
     return {
       type: 'cosmos-sdk/v1/MsgSubmitProposal',
       value: {
-        messages: messages.map((msg) => msg.toAmino()),
+        messages: messages.map((msg): Msg.Amino => msg.toAmino()),
         initial_deposit: initial_deposit.toAmino(),
         proposer,
         metadata: metadata && metadata !== '' ? metadata : undefined,
diff --git a/src/core/gov/msgs/MsgSubmitProposalLegacy.ts b/src/core/gov/msgs/MsgSubmitProposalLegacy.ts
index bdeb78f..488c63a 100644
--- a/src/core/gov/msgs/MsgSubmitProposalLegacy.ts
+++ b/src/core/gov/msgs/MsgSubmitProposalLegacy.ts
@@ -21,7 +21,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
    * @param proposer proposer's account address
    */
   constructor(
-    public content: Content,
+    public content: Content | undefined,
     initial_deposit: Coins.Input,
     public proposer: AccAddress
   ) {
@@ -36,7 +36,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
       value: { content, initial_deposit, proposer },
     } = data
     return new MsgSubmitProposalLegacy(
-      Content.fromAmino(content),
+      content ? Content.fromAmino(content) : undefined,
       Coins.fromAmino(initial_deposit),
       proposer
     )
@@ -47,7 +47,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
     return {
       type: 'cosmos-sdk/MsgSubmitProposal',
       value: {
-        content: content.toAmino(),
+        content: content?.toAmino(),
         initial_deposit: initial_deposit.toAmino(),
         proposer,
       },
@@ -59,7 +59,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
   ): MsgSubmitProposalLegacy {
     const { content, initial_deposit, proposer } = data
     return new MsgSubmitProposalLegacy(
-      Content.fromData(content),
+      content ? Content.fromData(content) : undefined,
       Coins.fromData(initial_deposit),
       proposer
     )
@@ -69,7 +69,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
     const { content, initial_deposit, proposer } = this
     return {
       '@type': '/cosmos.gov.v1beta1.MsgSubmitProposal',
-      content: content.toData(),
+      content: content?.toData(),
       initial_deposit: initial_deposit.toData(),
       proposer,
     }
@@ -79,7 +79,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
     proto: MsgSubmitProposalLegacy.Proto
   ): MsgSubmitProposalLegacy {
     return new MsgSubmitProposalLegacy(
-      Content.fromProto(proto.content as any),
+      proto.content ? Content.fromProto(proto.content) : undefined,
       Coins.fromProto(proto.initialDeposit),
       proto.proposer
     )
@@ -88,7 +88,7 @@ export class MsgSubmitProposalLegacy extends JSONSerializable<
   public toProto(): MsgSubmitProposalLegacy.Proto {
     const { content, initial_deposit, proposer } = this
     return MsgSubmitProposal_pb.fromPartial({
-      content: content.packAny(),
+      content: content?.packAny(),
       initialDeposit: initial_deposit.toProto(),
       proposer,
     })
@@ -112,7 +112,7 @@ export namespace MsgSubmitProposalLegacy {
   export interface Amino {
     type: 'cosmos-sdk/MsgSubmitProposal'
     value: {
-      content: Content.Amino
+      content: Content.Amino | undefined
       initial_deposit: Coins.Amino
       proposer: AccAddress
     }
@@ -120,7 +120,7 @@ export namespace MsgSubmitProposalLegacy {
 
   export interface Data {
     '@type': '/cosmos.gov.v1beta1.MsgSubmitProposal'
-    content: Content.Data
+    content: Content.Data | undefined
     initial_deposit: Coins.Data
     proposer: AccAddress
   }
diff --git a/src/core/gov/proposals/Proposal.ts b/src/core/gov/proposals/Proposal.ts
index db20976..a8dd2bc 100644
--- a/src/core/gov/proposals/Proposal.ts
+++ b/src/core/gov/proposals/Proposal.ts
@@ -142,7 +142,7 @@ export class Proposal extends JSONSerializable<
 
     return {
       id: id.toString(),
-      messages: messages.map((msg) => msg.toAmino()),
+      messages: messages.map((msg): Msg.Amino => msg.toAmino()),
       status: proposalStatusToJSON(status),
       final_tally_result: {
         yes_count: num(final_tally_result.yes_count).toFixed(),
diff --git a/src/core/group/GroupProposal.ts b/src/core/group/GroupProposal.ts
index c9eb3eb..85fc5fc 100644
--- a/src/core/group/GroupProposal.ts
+++ b/src/core/group/GroupProposal.ts
@@ -139,7 +139,7 @@ export class GroupProposal extends JSONSerializable<
       },
       voting_period_end: voting_period_end.toISOString(),
       executor_result: proposalExecutorResultToJSON(executor_result),
-      messages: messages.map((msg) => msg.toAmino()),
+      messages: messages.map((msg): Msg.Amino => msg.toAmino()),
       title,
       summary,
     }
diff --git a/src/core/group/msgs/MsgSubmitGroupProposal.ts b/src/core/group/msgs/MsgSubmitGroupProposal.ts
index e4fd3e8..a482062 100644
--- a/src/core/group/msgs/MsgSubmitGroupProposal.ts
+++ b/src/core/group/msgs/MsgSubmitGroupProposal.ts
@@ -78,7 +78,7 @@ export class MsgSubmitGroupProposal extends JSONSerializable<
         group_policy_address,
         proposers,
         metadata,
-        messages: messages.map((msg) => msg.toAmino()),
+        messages: messages.map((msg): Msg.Amino => msg.toAmino()),
         exec: execToJSON(exec),
         title,
         summary,
diff --git a/src/core/ibc/core/connection/msgs/MsgConnectionOpenTry.ts b/src/core/ibc/core/connection/msgs/MsgConnectionOpenTry.ts
index 2e2898d..fd6f3f4 100644
--- a/src/core/ibc/core/connection/msgs/MsgConnectionOpenTry.ts
+++ b/src/core/ibc/core/connection/msgs/MsgConnectionOpenTry.ts
@@ -30,7 +30,7 @@ export class MsgConnectionOpenTry extends JSONSerializable<
    */
   constructor(
     public client_id: string,
-    public client_state: any,
+    public client_state: Any | undefined,
     public counterparty: ConnectionCounterparty | undefined,
     public delay_period: number,
     public counterparty_versions: IbcVersion[],
@@ -152,7 +152,7 @@ export class MsgConnectionOpenTry extends JSONSerializable<
     } = this
     return MsgConnectionOpenTry_pb.fromPartial({
       clientId: client_id,
-      clientState: client_state.toProto(),
+      clientState: client_state,
       counterparty: counterparty?.toProto(),
       delayPeriod: Long.fromNumber(delay_period),
       counterpartyVersions: counterparty_versions.map((cv) => cv.toProto()),
@@ -183,7 +183,7 @@ export namespace MsgConnectionOpenTry {
   export interface Data {
     '@type': '/ibc.core.connection.v1.MsgConnectionOpenTry'
     client_id: string
-    client_state: Any
+    client_state?: Any
     counterparty?: ConnectionCounterparty.Data
     delay_period: string
     counterparty_versions: IbcVersion.Data[]
diff --git a/src/core/intertx/msgs/MsgSubmitTx.ts b/src/core/intertx/msgs/MsgSubmitTx.ts
index adb4015..6249174 100644
--- a/src/core/intertx/msgs/MsgSubmitTx.ts
+++ b/src/core/intertx/msgs/MsgSubmitTx.ts
@@ -17,7 +17,7 @@ export class MsgSubmitTx extends JSONSerializable<
   constructor(
     public owner: AccAddress,
     public connection_id: string,
-    public msg: Msg
+    public msg?: Msg
   ) {
     super()
   }
@@ -27,7 +27,11 @@ export class MsgSubmitTx extends JSONSerializable<
       value: { owner, connection_id, msg },
     } = data
 
-    return new MsgSubmitTx(owner, connection_id, Msg.fromAmino(msg))
+    return new MsgSubmitTx(
+      owner,
+      connection_id,
+      msg ? Msg.fromAmino(msg) : undefined
+    )
   }
 
   public toAmino(): MsgSubmitTx.Amino {
@@ -37,14 +41,18 @@ export class MsgSubmitTx extends JSONSerializable<
       value: {
         owner,
         connection_id,
-        msg: msg.toAmino(),
+        msg: msg?.toAmino(),
       },
     }
   }
 
   public static fromData(data: MsgSubmitTx.Data): MsgSubmitTx {
     const { owner, connection_id, msg } = data
-    return new MsgSubmitTx(owner, connection_id, Msg.fromData(msg))
+    return new MsgSubmitTx(
+      owner,
+      connection_id,
+      msg ? Msg.fromData(msg) : undefined
+    )
   }
 
   public toData(): MsgSubmitTx.Data {
@@ -53,7 +61,7 @@ export class MsgSubmitTx extends JSONSerializable<
       '@type': '/initia.intertx.v1.MsgSubmitTx',
       owner,
       connection_id,
-      msg: msg.toData(),
+      msg: msg?.toData(),
     }
   }
 
@@ -61,7 +69,7 @@ export class MsgSubmitTx extends JSONSerializable<
     return new MsgSubmitTx(
       proto.owner,
       proto.connectionId,
-      Msg.fromProto(proto.msg as any)
+      proto.msg ? Msg.fromProto(proto.msg) : undefined
     )
   }
 
@@ -70,7 +78,7 @@ export class MsgSubmitTx extends JSONSerializable<
     return MsgSubmitTx_pb.fromPartial({
       owner,
       connectionId: connection_id,
-      msg: msg.packAny(),
+      msg: msg?.packAny(),
     })
   }
 
@@ -92,7 +100,7 @@ export namespace MsgSubmitTx {
     value: {
       owner: AccAddress
       connection_id: string
-      msg: Msg.Amino
+      msg?: Msg.Amino
     }
   }
 
@@ -100,7 +108,7 @@ export namespace MsgSubmitTx {
     '@type': '/initia.intertx.v1.MsgSubmitTx'
     owner: AccAddress
     connection_id: string
-    msg: Msg.Data
+    msg?: Msg.Data
   }
 
   export type Proto = MsgSubmitTx_pb
diff --git a/src/core/opchild/msgs/MsgExecuteMessages.ts b/src/core/opchild/msgs/MsgExecuteMessages.ts
index 8a1af07..8256abc 100644
--- a/src/core/opchild/msgs/MsgExecuteMessages.ts
+++ b/src/core/opchild/msgs/MsgExecuteMessages.ts
@@ -33,7 +33,7 @@ export class MsgExecuteMessages extends JSONSerializable<
       type: 'opchild/MsgExecuteMessages',
       value: {
         sender,
-        messages: messages.map((msg) => msg.toAmino()),
+        messages: messages.map((msg): Msg.Amino => msg.toAmino()),
       },
     }
   }
diff --git a/src/core/tx/SignDoc.ts b/src/core/tx/SignDoc.ts
index 0c7eae4..2c1a612 100644
--- a/src/core/tx/SignDoc.ts
+++ b/src/core/tx/SignDoc.ts
@@ -55,7 +55,7 @@ export class SignDoc extends JSONSerializable<
           ? timeout_height.toString()
           : undefined,
       fee: fee.toAmino(),
-      msgs: messages.map((m) => m.toAmino()),
+      msgs: messages.map((m): Msg.Amino => m.toAmino()),
       memo: memo ?? '',
     }
   }
diff --git a/src/key/RawKey.ts b/src/key/RawKey.ts
index 4ddff2d..5b57a7a 100644
--- a/src/key/RawKey.ts
+++ b/src/key/RawKey.ts
@@ -28,6 +28,7 @@ export class RawKey extends Key {
     return new RawKey(Buffer.from(hex, 'hex'))
   }
 
+  // eslint-disable-next-line @typescript-eslint/require-await
   public async sign(payload: Buffer): Promise<Buffer> {
     const hash = Buffer.from(
       SHA256.hash(new Word32Array(payload)).toString(),
@@ -42,6 +43,7 @@ export class RawKey extends Key {
     return Buffer.from(signature)
   }
 
+  // eslint-disable-next-line @typescript-eslint/require-await
   public async signWithKeccak256(payload: Buffer): Promise<Buffer> {
     const hash = keccak256(payload)
 
diff --git a/src/key/ledger/LedgerKey.ts b/src/key/ledger/LedgerKey.ts
index 84833ca..7a48cc3 100644
--- a/src/key/ledger/LedgerKey.ts
+++ b/src/key/ledger/LedgerKey.ts
@@ -123,6 +123,7 @@ export class LedgerKey extends Key {
     return this
   }
 
+  // eslint-disable-next-line @typescript-eslint/require-await
   public async sign(message: Buffer): Promise<Buffer> {
     if (!this.publicKey) {
       await this.loadAccountDetails()
@@ -130,14 +131,15 @@ export class LedgerKey extends Key {
     const res = await this.app.sign(this.path, message)
     checkLedgerErrors(res)
 
-    return Buffer.from(signatureImport(Buffer.from(res.signature as any)))
+    return Buffer.from(signatureImport(Buffer.from(res.signature as any))) // eslint-disable-line @typescript-eslint/no-unsafe-argument
   }
 
+  // eslint-disable-next-line @typescript-eslint/require-await
   public async signWithKeccak256(): Promise<Buffer> {
     throw new Error('LedgerKey does not support signWithKeccak256()')
   }
 
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars,@typescript-eslint/require-await
   public async createSignature(_tx: SignDoc): Promise<SignatureV2> {
     throw new Error('direct sign mode is not supported')
   }
diff --git a/src/key/ledger/device.ts b/src/key/ledger/device.ts
index edb9a87..58c5cac 100644
--- a/src/key/ledger/device.ts
+++ b/src/key/ledger/device.ts
@@ -38,8 +38,8 @@ function processErrorResponse(response: any) {
     if (isDict(response)) {
       if (Object.prototype.hasOwnProperty.call(response, 'statusCode')) {
         return {
-          return_code: response.statusCode,
-          error_message: errorCodeToString(response.statusCode),
+          return_code: response.statusCode, // eslint-disable-line @typescript-eslint/no-unsafe-member-access
+          error_message: errorCodeToString(response.statusCode as number), // eslint-disable-line @typescript-eslint/no-unsafe-member-access
         }
       }
 
@@ -53,13 +53,13 @@ function processErrorResponse(response: any) {
 
     return {
       return_code: 0xffff,
-      error_message: response.toString(),
+      error_message: response.toString(), // eslint-disable-line @typescript-eslint/no-unsafe-call,@typescript-eslint/no-unsafe-member-access
     }
   }
 
   return {
     return_code: 0xffff,
-    error_message: response.toString(),
+    error_message: response.toString(), // eslint-disable-line @typescript-eslint/no-unsafe-call,@typescript-eslint/no-unsafe-member-access
   }
 }
 
diff --git a/src/util/json.ts b/src/util/json.ts
index c402293..db487d6 100644
--- a/src/util/json.ts
+++ b/src/util/json.ts
@@ -10,11 +10,12 @@ export function prepareSignBytes(obj: any): any {
 
   const sorted: any = {}
 
+  // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
   Object.keys(obj)
     .sort()
     .forEach((key) => {
-      if (obj[key] === undefined || obj[key] === null) return
-      sorted[key] = prepareSignBytes(obj[key])
+      if (obj[key] === undefined || obj[key] === null) return // eslint-disable-line @typescript-eslint/no-unsafe-member-access
+      sorted[key] = prepareSignBytes(obj[key]) // eslint-disable-line @typescript-eslint/no-unsafe-member-access
     })
   return sorted
 }
@@ -33,7 +34,8 @@ export abstract class JSONSerializable<A, D, P> {
 
 export function removeNull(obj: any): any {
   if (obj !== null && typeof obj === 'object') {
-    return Object.entries(obj)
+    // eslint-disable-line @typescript-eslint/no-unsafe-argument
+    return Object.entries(obj) // eslint-disable-line @typescript-eslint/no-unsafe-argument
       .filter(([, v]) => v != null)
       .reduce(
         (acc, [k, v]) => ({