diff --git a/packages/cosmwasm/src/cosmwasmclient.spec.ts b/packages/cosmwasm/src/cosmwasmclient.spec.ts
index f5783812..d456dc3b 100644
--- a/packages/cosmwasm/src/cosmwasmclient.spec.ts
+++ b/packages/cosmwasm/src/cosmwasmclient.spec.ts
@@ -94,7 +94,7 @@ describe("CosmWasmClient", () => {
 
       const height2 = await client.getHeight();
       expect(height2).toBeGreaterThan(0);
-      await sleep(blockTime);
+      await sleep(blockTime * 1.3); // tolerate chain being 30% slower than expected
       const height3 = await client.getHeight();
       expect(height3).toBeGreaterThanOrEqual(height2 + 1);
       expect(height3).toBeLessThanOrEqual(height2 + 2);
diff --git a/packages/sdk38/src/cosmosclient.spec.ts b/packages/sdk38/src/cosmosclient.spec.ts
index d3b97955..d5e00079 100644
--- a/packages/sdk38/src/cosmosclient.spec.ts
+++ b/packages/sdk38/src/cosmosclient.spec.ts
@@ -82,7 +82,7 @@ describe("CosmosClient", () => {
 
       const height2 = await client.getHeight();
       expect(height2).toBeGreaterThan(0);
-      await sleep(blockTime);
+      await sleep(blockTime * 1.3); // tolerate chain being 30% slower than expected
       const height3 = await client.getHeight();
       expect(height3).toBeGreaterThanOrEqual(height2 + 1);
       expect(height3).toBeLessThanOrEqual(height2 + 2);