diff --git a/packages/cosmwasm/src/cosmwasmclient.spec.ts b/packages/cosmwasm/src/cosmwasmclient.spec.ts
index 1898982e..398cfc32 100644
--- a/packages/cosmwasm/src/cosmwasmclient.spec.ts
+++ b/packages/cosmwasm/src/cosmwasmclient.spec.ts
@@ -72,7 +72,7 @@ describe("CosmWasmClient", () => {
 
       const height1 = await client.getHeight();
       expect(height1).toBeGreaterThan(0);
-      await sleep(blockTime * 1.3); // tolerate chain being 30% slower than expected
+      await sleep(blockTime * 1.4); // tolerate chain being 40% slower than expected
       const height2 = await client.getHeight();
       expect(height2).toBeGreaterThanOrEqual(height1 + 1);
       expect(height2).toBeLessThanOrEqual(height1 + 2);
diff --git a/packages/sdk38/src/cosmosclient.spec.ts b/packages/sdk38/src/cosmosclient.spec.ts
index 47433ee9..8cf1c1e4 100644
--- a/packages/sdk38/src/cosmosclient.spec.ts
+++ b/packages/sdk38/src/cosmosclient.spec.ts
@@ -60,7 +60,7 @@ describe("CosmosClient", () => {
 
       const height1 = await client.getHeight();
       expect(height1).toBeGreaterThan(0);
-      await sleep(blockTime * 1.3); // tolerate chain being 30% slower than expected
+      await sleep(blockTime * 1.4); // tolerate chain being 40% slower than expected
       const height2 = await client.getHeight();
       expect(height2).toBeGreaterThanOrEqual(height1 + 1);
       expect(height2).toBeLessThanOrEqual(height1 + 2);