diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3eaac579..7b39c428 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,7 +39,8 @@ and this project adheres to
   `WebsocketClient` constructors ([#897]).
 - all: Upgrade cosmjs-types to 0.4. This includes the types of the Cosmos SDK
   0.44 modules x/authz and x/feegrant. It causes a few breaking changes by
-  adding fields to interfaces. ([#928])
+  adding fields to interfaces as well as changing `Date` to a `Timestamp`
+  object. ([#928])
 - @cosmjs/stargate and @cosmjs/cosmwasm-stargate: Add simulation support
   ([#931]).
 - @cosmjs/tendermint-rpc: Remove `Tendermint33Client` and related symbols.
diff --git a/packages/stargate/src/queries/gov.spec.ts b/packages/stargate/src/queries/gov.spec.ts
index fc917a7d..cae143ff 100644
--- a/packages/stargate/src/queries/gov.spec.ts
+++ b/packages/stargate/src/queries/gov.spec.ts
@@ -235,11 +235,11 @@ describe("GovExtension", () => {
         proposalId: longify(proposalId),
         status: ProposalStatus.PROPOSAL_STATUS_VOTING_PERIOD,
         finalTallyResult: { yes: "0", abstain: "0", no: "0", noWithVeto: "0" },
-        submitTime: jasmine.any(Date),
-        depositEndTime: jasmine.any(Date),
+        submitTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
+        depositEndTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
         totalDeposit: initialDeposit,
-        votingStartTime: jasmine.any(Date),
-        votingEndTime: jasmine.any(Date),
+        votingStartTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
+        votingEndTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
       });
 
       tmClient.disconnect();
@@ -261,11 +261,11 @@ describe("GovExtension", () => {
         proposalId: longify(proposalId),
         status: ProposalStatus.PROPOSAL_STATUS_VOTING_PERIOD,
         finalTallyResult: { yes: "0", abstain: "0", no: "0", noWithVeto: "0" },
-        submitTime: jasmine.any(Date),
-        depositEndTime: jasmine.any(Date),
+        submitTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
+        depositEndTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
         totalDeposit: initialDeposit,
-        votingStartTime: jasmine.any(Date),
-        votingEndTime: jasmine.any(Date),
+        votingStartTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
+        votingEndTime: { seconds: jasmine.any(Long), nanos: jasmine.any(Number) },
       });
 
       tmClient.disconnect();