diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bbddd251d4..47e5f94eab 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -79,6 +79,7 @@ jobs:
           make test
 
           # run versiondb tests
+          nix registry add nixpkgs github:NixOS/nixpkgs/23.05
           nix profile install nixpkgs#rocksdb
           export PKG_CONFIG_PATH=$HOME/.nix-profile/lib/pkgconfig
           export CGO_CFLAGS="$(pkg-config --cflags rocksdb)" CGO_LDFLAGS="$(pkg-config --libs rocksdb)"
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index e718d73a32..5d45f84a24 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -41,6 +41,7 @@ jobs:
             *.sum
       - name: run golangci-lint
         run: |
+          nix registry add nixpkgs github:NixOS/nixpkgs/23.05
           nix profile install nixpkgs#rocksdb nixpkgs#golangci-lint
           export PKG_CONFIG_PATH=$HOME/.nix-profile/lib/pkgconfig
           export CGO_CFLAGS="$(pkg-config --cflags rocksdb)" CGO_LDFLAGS="$(pkg-config --libs rocksdb)"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 337a17ec86..ef9697674f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@
 - [#1073](https://github.com/crypto-org-chain/cronos/pull/1073) memiavl automatically truncate corrupted wal tail.
 - [#1087](https://github.com/crypto-org-chain/cronos/pull/1087) memiavl fix LastCommitID when memiavl db not loaded.
 - [#1088](https://github.com/crypto-org-chain/cronos/pull/1088) memiavl fix empty value in write-ahead-log replaying.
+- [#1102](https://github.com/crypto-org-chain/cronos/pull/1102) avoid duplicate cache events emitted from ibc and gravity hook.
 
 ### Features
 
diff --git a/integration_tests/test_gravity.py b/integration_tests/test_gravity.py
index 59f2262307..faf832b030 100644
--- a/integration_tests/test_gravity.py
+++ b/integration_tests/test_gravity.py
@@ -1,9 +1,11 @@
 import json
 
 import pytest
+import requests
 from eth_account.account import Account
 from eth_utils import abi
 from hexbytes import HexBytes
+from pystarport import ports
 from web3.exceptions import BadFunctionCallOutput
 
 from .gravity_utils import prepare_gravity, setup_cosmos_erc20_contract
@@ -295,6 +297,17 @@ def check():
 
     wait_for_fn("check balance on cronos", check)
 
+    # check duplicate end_block_events
+    height = cli.block_height()
+    port = ports.rpc_port(gravity.cronos.base_port(0))
+    url = f"http://127.0.0.1:{port}/block_results?height={height}"
+    res = requests.get(url).json().get("result")
+    if res:
+        events = res["end_block_events"]
+        target = "ethereum_send_to_cosmos_handled"
+        count = sum(1 for evt in events if evt["type"] == target)
+        assert count <= 2, f"duplicate {target}"
+
 
 def test_direct_token_mapping(gravity):
     """
diff --git a/integration_tests/test_ibc.py b/integration_tests/test_ibc.py
index 30ebe17bf3..ff5a4dceea 100644
--- a/integration_tests/test_ibc.py
+++ b/integration_tests/test_ibc.py
@@ -37,6 +37,21 @@ def get_balances(chain, addr):
     return chain.cosmos_cli().balances(addr)
 
 
+def find_duplicate(attributes):
+    res = set()
+    key = attributes[0]["key"]
+    for attribute in attributes:
+        if attribute["key"] == key:
+            value0 = attribute["value"]
+        elif attribute["key"] == "amount":
+            amount = attribute["value"]
+            value_pair = f"{value0}:{amount}"
+            if value_pair in res:
+                return value_pair
+            res.add(value_pair)
+    return None
+
+
 def test_ibc_transfer_with_hermes(ibc):
     """
     test ibc transfer tokens with hermes cli
@@ -68,6 +83,14 @@ def check_balance_change():
     # rather than the normal gas price
     assert fee == gas * 1000000
 
+    # check duplicate OnRecvPacket events
+    criteria = "message.action=/ibc.core.channel.v1.MsgRecvPacket"
+    tx = cli.tx_search(criteria)["txs"][0]
+    events = tx["logs"][1]["events"]
+    for event in events:
+        dup = find_duplicate(event["attributes"])
+        assert not dup, f"duplicate {dup} in {event['type']}"
+
 
 def test_ibc_incentivized_transfer(ibc):
     if not ibc.incentivized:
diff --git a/x/cronos/keeper/gravity_hooks.go b/x/cronos/keeper/gravity_hooks.go
index 139430554d..610d347f28 100644
--- a/x/cronos/keeper/gravity_hooks.go
+++ b/x/cronos/keeper/gravity_hooks.go
@@ -44,7 +44,6 @@ func (k Keeper) AfterSendToCosmosEvent(ctx sdk.Context, event gravitytypes.SendT
 	err := k.doAfterSendToCosmosEvent(cacheCtx, event)
 	if err == nil {
 		commit()
-		ctx.EventManager().EmitEvents(cacheCtx.EventManager().Events())
 	} else {
 		k.Logger(ctx).Error("AfterSendToCosmosEvent hook failed", "error", err)
 	}
diff --git a/x/cronos/keeper/keeper.go b/x/cronos/keeper/keeper.go
index ab3767031c..c7541eae0c 100644
--- a/x/cronos/keeper/keeper.go
+++ b/x/cronos/keeper/keeper.go
@@ -202,7 +202,6 @@ func (k Keeper) OnRecvVouchers(
 	err := k.ConvertVouchersToEvmCoins(cacheCtx, receiver, tokens)
 	if err == nil {
 		commit()
-		ctx.EventManager().EmitEvents(cacheCtx.EventManager().Events())
 	} else {
 		k.Logger(ctx).Error(
 			fmt.Sprintf("Failed to convert vouchers to evm tokens for receiver %s, coins %s. Receive error %s",