diff --git a/packages/tendermint-rpc/src/client.spec.ts b/packages/tendermint-rpc/src/client.spec.ts
index c6116f27..2e7e4557 100644
--- a/packages/tendermint-rpc/src/client.spec.ts
+++ b/packages/tendermint-rpc/src/client.spec.ts
@@ -1,4 +1,3 @@
-// tslint:disable:readonly-array
 import { toAscii } from "@cosmjs/encoding";
 import { sleep } from "@cosmjs/utils";
 import { firstEvent, toListPromise } from "@iov/stream";
diff --git a/packages/tendermint-rpc/src/client.ts b/packages/tendermint-rpc/src/client.ts
index 7cf9db22..23fd42ec 100644
--- a/packages/tendermint-rpc/src/client.ts
+++ b/packages/tendermint-rpc/src/client.ts
@@ -197,7 +197,6 @@ export class Client {
   // starts with page 1 or whatever was provided (eg. to start on page 7)
   public async txSearchAll(params: requests.TxSearchParams): Promise<responses.TxSearchResponse> {
     let page = params.page || 1;
-    // tslint:disable-next-line:readonly-array
     const txs: responses.TxResponse[] = [];
     let done = false;
 
diff --git a/packages/tendermint-rpc/src/encodings.spec.ts b/packages/tendermint-rpc/src/encodings.spec.ts
index f251ef16..afea0600 100644
--- a/packages/tendermint-rpc/src/encodings.spec.ts
+++ b/packages/tendermint-rpc/src/encodings.spec.ts
@@ -27,7 +27,6 @@ describe("encodings", () => {
   describe("encodeTime", () => {
     it("works", () => {
       const readonlyDateWithNanoseconds = new ReadonlyDate(1464109200);
-      // tslint:disable-next-line:no-object-mutation
       (readonlyDateWithNanoseconds as any).nanoseconds = 666666;
       expect(encodeTime(readonlyDateWithNanoseconds)).toEqual(
         Uint8Array.from([0x08, 173, 174, 89, 0x10, 170, 220, 215, 95]),
diff --git a/packages/tendermint-rpc/src/encodings.ts b/packages/tendermint-rpc/src/encodings.ts
index ac8bc925..b57ba1c9 100644
--- a/packages/tendermint-rpc/src/encodings.ts
+++ b/packages/tendermint-rpc/src/encodings.ts
@@ -162,7 +162,6 @@ export class DateTime {
     const readonlyDate = fromRfc3339(dateTimeString);
     const nanosecondsMatch = dateTimeString.match(/\.(\d+)Z$/);
     const nanoseconds = nanosecondsMatch ? nanosecondsMatch[1].slice(3) : "";
-    // tslint:disable-next-line:no-object-mutation
     (readonlyDate as any).nanoseconds = parseInt(nanoseconds.padEnd(6, "0"), 10);
     return readonlyDate as ReadonlyDateWithNanoseconds;
   }
@@ -189,7 +188,7 @@ export function encodeString(s: string): Uint8Array {
 
 // See https://github.com/tendermint/go-amino/blob/v0.15.0/encoder.go#L79-L87
 export function encodeInt(n: number): Uint8Array {
-  // tslint:disable-next-line:no-bitwise
+  // eslint-disable-next-line no-bitwise
   return n >= 0x80 ? Uint8Array.from([(n & 0xff) | 0x80, ...encodeInt(n >> 7)]) : Uint8Array.from([n & 0xff]);
 }
 
diff --git a/packages/tendermint-rpc/src/rpcclients/websocketclient.spec.ts b/packages/tendermint-rpc/src/rpcclients/websocketclient.spec.ts
index df96a06a..9008e2c6 100644
--- a/packages/tendermint-rpc/src/rpcclients/websocketclient.spec.ts
+++ b/packages/tendermint-rpc/src/rpcclients/websocketclient.spec.ts
@@ -46,7 +46,6 @@ describe("WebsocketClient", () => {
     const req = createJsonRpcRequest("subscribe", { query: query });
     const headers = client.listen(req);
 
-    // tslint:disable-next-line:readonly-array
     const events: SubscriptionEvent[] = [];
 
     const sub = headers.subscribe({
@@ -109,7 +108,6 @@ describe("WebsocketClient", () => {
     const req = createJsonRpcRequest("subscribe", { query: query });
     const headers = client.listen(req);
 
-    // tslint:disable-next-line:readonly-array
     const events: SubscriptionEvent[] = [];
 
     const sub = headers.subscribe({
@@ -148,7 +146,6 @@ describe("WebsocketClient", () => {
     const req = createJsonRpcRequest("subscribe", { query: query });
     const headers = client.listen(req);
 
-    // tslint:disable-next-line:readonly-array
     const receivedEvents: SubscriptionEvent[] = [];
 
     setTimeout(() => client.disconnect(), 1500);
diff --git a/packages/tendermint-rpc/src/rpcclients/websocketclient.ts b/packages/tendermint-rpc/src/rpcclients/websocketclient.ts
index e22595c3..9d84f817 100644
--- a/packages/tendermint-rpc/src/rpcclients/websocketclient.ts
+++ b/packages/tendermint-rpc/src/rpcclients/websocketclient.ts
@@ -1,4 +1,3 @@
-/* tslint:disable:readonly-keyword readonly-array no-object-mutation */
 import {
   isJsonRpcErrorResponse,
   JsonRpcId,
diff --git a/packages/tendermint-rpc/src/v0-33/hasher.spec.ts b/packages/tendermint-rpc/src/v0-33/hasher.spec.ts
index f78576b7..96d9feb0 100644
--- a/packages/tendermint-rpc/src/v0-33/hasher.spec.ts
+++ b/packages/tendermint-rpc/src/v0-33/hasher.spec.ts
@@ -19,7 +19,6 @@ describe("Hasher", () => {
     // curl "http://localhost:11133/block"
     const blockId = fromHex("153C484DCBC33633F0616BC019388C93DEA94F7880627976F2BFE83749E062F7");
     const time = new ReadonlyDate("2020-06-23T13:54:15.4638668Z");
-    // tslint:disable-next-line:no-object-mutation
     (time as any).nanoseconds = 866800;
     const blockData = {
       version: {
@@ -58,7 +57,6 @@ describe("Hasher", () => {
     // curl "http://localhost:11133/block?height=13575"
     const blockId = fromHex("FF2995AF1F38B9A584077E53B5E144778718FB86539A51886A2C55F730403373");
     const time = new ReadonlyDate("2020-06-23T15:34:12.3232688Z");
-    // tslint:disable-next-line:no-object-mutation
     (time as any).nanoseconds = 268800;
     const blockData = {
       version: {