diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9745c383a5..af3d667b53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to
   changes all 64 bit int fields from type `long` to `bigint`. As part of the
   upgrade, the types do not require the `long` and `protobufjs` anymore.
   ([#1484])
+- all: `gasWanted`/`gasUsed` fields were changed from type `number` to `bigint`
+  to supported cases where users put very high gas values in there ([#1465]).
 - Drop support for Node.js 14 and add support for Node.js 20. ([#1421])
 - @cosmjs/tendermint-rpc: Remove `Adaptor` abstractions which are not needed
   anymore by haing a dedicated client for each backend.
@@ -34,6 +36,7 @@ and this project adheres to
   `.getCometClient`/`.forceGetCometClient`.
 
 [#1421]: https://github.com/cosmos/cosmjs/issues/1421
+[#1465]: https://github.com/cosmos/cosmjs/issues/1465
 [#1484]: https://github.com/cosmos/cosmjs/pull/1484
 
 ### Deprecated
diff --git a/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts b/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
index ab80616b61..e3538003c5 100644
--- a/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
+++ b/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
@@ -78,8 +78,8 @@ export interface UploadResult {
   /** Transaction hash (might be used as transaction ID). Guaranteed to be non-empty upper-case hex */
   readonly transactionHash: string;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 /**
@@ -112,8 +112,8 @@ export interface InstantiateResult {
   /** Transaction hash (might be used as transaction ID). Guaranteed to be non-empty upper-case hex */
   readonly transactionHash: string;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 /**
@@ -126,8 +126,8 @@ export interface ChangeAdminResult {
   /** Transaction hash (might be used as transaction ID). Guaranteed to be non-empty upper-case hex */
   readonly transactionHash: string;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 export interface MigrateResult {
@@ -137,8 +137,8 @@ export interface MigrateResult {
   /** Transaction hash (might be used as transaction ID). Guaranteed to be non-empty upper-case hex */
   readonly transactionHash: string;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 export interface ExecuteInstruction {
@@ -154,8 +154,8 @@ export interface ExecuteResult {
   /** Transaction hash (might be used as transaction ID). Guaranteed to be non-empty upper-case hex */
   readonly transactionHash: string;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 function createDeliverTxResponseErrorMessage(result: DeliverTxResponse): string {
diff --git a/packages/stargate/src/signingstargateclient.spec.ts b/packages/stargate/src/signingstargateclient.spec.ts
index 0699ad9198..496ce3a792 100644
--- a/packages/stargate/src/signingstargateclient.spec.ts
+++ b/packages/stargate/src/signingstargateclient.spec.ts
@@ -366,9 +366,9 @@ describe("SigningStargateClient", () => {
         const result = await client.signAndBroadcast(faucet.address0, [msgAny], fee, memo);
         assertIsDeliverTxSuccess(result);
         expect(result.code).toEqual(0);
-        expect(result.gasWanted).toEqual(222_000);
-        expect(result.gasUsed).toBeLessThanOrEqual(222_000);
-        expect(result.gasUsed).toBeGreaterThan(100_000);
+        expect(result.gasWanted).toEqual(222_000n);
+        expect(Number(result.gasUsed)).toBeLessThanOrEqual(222_000);
+        expect(Number(result.gasUsed)).toBeGreaterThan(100_000);
       });
 
       it("returns DeliverTxFailure on DeliverTx failure", async () => {
@@ -396,9 +396,9 @@ describe("SigningStargateClient", () => {
         const result = await client.signAndBroadcast(faucet.address0, [msgAny], fee);
         assertIsDeliverTxFailure(result);
         expect(result.code).toBeGreaterThan(0);
-        expect(result.gasWanted).toEqual(99_000);
-        expect(result.gasUsed).toBeLessThanOrEqual(99_000);
-        expect(result.gasUsed).toBeGreaterThan(40_000);
+        expect(result.gasWanted).toEqual(99_000n);
+        expect(Number(result.gasUsed)).toBeLessThanOrEqual(99_000);
+        expect(Number(result.gasUsed)).toBeGreaterThan(40_000);
       });
 
       it("works with auto gas", async () => {
diff --git a/packages/stargate/src/stargateclient.spec.ts b/packages/stargate/src/stargateclient.spec.ts
index 2ae554465f..f4de57adde 100644
--- a/packages/stargate/src/stargateclient.spec.ts
+++ b/packages/stargate/src/stargateclient.spec.ts
@@ -46,8 +46,8 @@ const resultFailure: DeliverTxResponse = {
   transactionHash: "FDC4FB701AABD465935F7D04AE490D1EF5F2BD4B227601C4E98B57EB077D9B7D",
   events: [],
   msgResponses: [],
-  gasUsed: 54396,
-  gasWanted: 200000,
+  gasUsed: 54396n,
+  gasWanted: 200000n,
 };
 const resultSuccess: DeliverTxResponse = {
   code: 0,
@@ -58,8 +58,8 @@ const resultSuccess: DeliverTxResponse = {
   transactionHash: "C0B416CA868C55C2B8C1BBB8F3CFA233854F13A5CB15D3E9599F50CAF7B3D161",
   events: [],
   msgResponses: [],
-  gasUsed: 61556,
-  gasWanted: 200000,
+  gasUsed: 61556n,
+  gasWanted: 200000n,
 };
 
 describe("isDeliverTxFailure", () => {
diff --git a/packages/stargate/src/stargateclient.ts b/packages/stargate/src/stargateclient.ts
index 2fca3bf98b..b48aaacc7b 100644
--- a/packages/stargate/src/stargateclient.ts
+++ b/packages/stargate/src/stargateclient.ts
@@ -91,8 +91,8 @@ export interface IndexedTx {
    * This field is an empty list for chains running Cosmos SDK < 0.46.
    */
   readonly msgResponses: Array<{ readonly typeUrl: string; readonly value: Uint8Array }>;
-  readonly gasUsed: number;
-  readonly gasWanted: number;
+  readonly gasUsed: bigint;
+  readonly gasWanted: bigint;
 }
 
 export interface SequenceResponse {
@@ -128,8 +128,8 @@ export interface DeliverTxResponse {
    * This field is an empty list for chains running Cosmos SDK < 0.46.
    */
   readonly msgResponses: Array<{ readonly typeUrl: string; readonly value: Uint8Array }>;
-  readonly gasUsed: number;
-  readonly gasWanted: number;
+  readonly gasUsed: bigint;
+  readonly gasWanted: bigint;
 }
 
 export function isDeliverTxFailure(result: DeliverTxResponse): boolean {
diff --git a/packages/tendermint-rpc/src/comet38/adaptor/responses.ts b/packages/tendermint-rpc/src/comet38/adaptor/responses.ts
index 0791539f40..6bec2343b7 100644
--- a/packages/tendermint-rpc/src/comet38/adaptor/responses.ts
+++ b/packages/tendermint-rpc/src/comet38/adaptor/responses.ts
@@ -159,8 +159,8 @@ function decodeTxData(data: RpcTxData): responses.TxData {
     log: data.log,
     data: may(fromBase64, data.data),
     events: data.events ? decodeEvents(data.events) : [],
-    gasWanted: apiToSmallInt(data.gas_wanted ?? "0"),
-    gasUsed: apiToSmallInt(data.gas_used ?? "0"),
+    gasWanted: apiToBigInt(data.gas_wanted ?? "0"),
+    gasUsed: apiToBigInt(data.gas_used ?? "0"),
   };
 }
 
diff --git a/packages/tendermint-rpc/src/comet38/responses.ts b/packages/tendermint-rpc/src/comet38/responses.ts
index 5d7f83f1c5..3477ba6bf8 100644
--- a/packages/tendermint-rpc/src/comet38/responses.ts
+++ b/packages/tendermint-rpc/src/comet38/responses.ts
@@ -203,8 +203,8 @@ export interface TxData {
   readonly log?: string;
   readonly data?: Uint8Array;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 export interface TxProof {
diff --git a/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts b/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
index bc8d2051b3..b3546dd914 100644
--- a/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
@@ -158,8 +158,8 @@ function decodeTxData(data: RpcTxData): responses.TxData {
     log: data.log,
     data: may(fromBase64, data.data),
     events: data.events ? decodeEvents(data.events) : [],
-    gasWanted: apiToSmallInt(data.gas_wanted ?? "0"),
-    gasUsed: apiToSmallInt(data.gas_used ?? "0"),
+    gasWanted: apiToBigInt(data.gas_wanted ?? "0"),
+    gasUsed: apiToBigInt(data.gas_used ?? "0"),
   };
 }
 
diff --git a/packages/tendermint-rpc/src/tendermint34/responses.ts b/packages/tendermint-rpc/src/tendermint34/responses.ts
index 4dec9c5df1..77b3aee64f 100644
--- a/packages/tendermint-rpc/src/tendermint34/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint34/responses.ts
@@ -196,8 +196,8 @@ export interface TxData {
   readonly log?: string;
   readonly data?: Uint8Array;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 export interface TxProof {
diff --git a/packages/tendermint-rpc/src/tendermint37/adaptor/responses.ts b/packages/tendermint-rpc/src/tendermint37/adaptor/responses.ts
index 8db6e3cb38..f0614ed49f 100644
--- a/packages/tendermint-rpc/src/tendermint37/adaptor/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint37/adaptor/responses.ts
@@ -159,8 +159,8 @@ function decodeTxData(data: RpcTxData): responses.TxData {
     log: data.log,
     data: may(fromBase64, data.data),
     events: data.events ? decodeEvents(data.events) : [],
-    gasWanted: apiToSmallInt(data.gas_wanted ?? "0"),
-    gasUsed: apiToSmallInt(data.gas_used ?? "0"),
+    gasWanted: apiToBigInt(data.gas_wanted ?? "0"),
+    gasUsed: apiToBigInt(data.gas_used ?? "0"),
   };
 }
 
diff --git a/packages/tendermint-rpc/src/tendermint37/responses.ts b/packages/tendermint-rpc/src/tendermint37/responses.ts
index 0b8d547009..70081e2e31 100644
--- a/packages/tendermint-rpc/src/tendermint37/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint37/responses.ts
@@ -201,8 +201,8 @@ export interface TxData {
   readonly log?: string;
   readonly data?: Uint8Array;
   readonly events: readonly Event[];
-  readonly gasWanted: number;
-  readonly gasUsed: number;
+  readonly gasWanted: bigint;
+  readonly gasUsed: bigint;
 }
 
 export interface TxProof {