diff --git a/src/index.ts b/src/index.ts
index 8f7a06a..41f11ff 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -90,9 +90,9 @@ import { publicKeyToProtobuf } from '@libp2p/crypto/keys'
 import { logger } from '@libp2p/logger'
 import NanoDate from 'timestamp-nano'
 import { fromString as uint8ArrayFromString } from 'uint8arrays/from-string'
-import { SignatureCreationError } from './errors.js'
-import { IpnsEntry } from './pb/ipns.js'
-import { createCborData, ipnsRecordDataForV1Sig, ipnsRecordDataForV2Sig, normalizeValue } from './utils.js'
+import { SignatureCreationError } from './errors.ts'
+import { IpnsEntry } from './pb/ipns.ts'
+import { createCborData, ipnsRecordDataForV1Sig, ipnsRecordDataForV2Sig, normalizeValue } from './utils.ts'
 import type { PrivateKey, PublicKey } from '@libp2p/interface'
 import type { Key } from 'interface-datastore/key'
 import type { CID } from 'multiformats/cid'
@@ -339,11 +339,11 @@ const _create = async (privateKey: PrivateKey, value: CID | PublicKey | Multihas
   }
 }
 
-export { unmarshalIPNSRecord } from './utils.js'
-export { marshalIPNSRecord } from './utils.js'
-export { multihashToIPNSRoutingKey } from './utils.js'
-export { multihashFromIPNSRoutingKey } from './utils.js'
-export { extractPublicKeyFromIPNSRecord } from './utils.js'
+export { unmarshalIPNSRecord } from './utils.ts'
+export { marshalIPNSRecord } from './utils.ts'
+export { multihashToIPNSRoutingKey } from './utils.ts'
+export { multihashFromIPNSRoutingKey } from './utils.ts'
+export { extractPublicKeyFromIPNSRecord } from './utils.ts'
 
 /**
  * Sign ipns record data using the legacy V1 signature scheme
diff --git a/src/selector.ts b/src/selector.ts
index 5dcbb11..1e49ecb 100644
--- a/src/selector.ts
+++ b/src/selector.ts
@@ -1,6 +1,6 @@
 import NanoDate from 'timestamp-nano'
-import { IpnsEntry } from './pb/ipns.js'
-import { unmarshalIPNSRecord } from './utils.js'
+import { IpnsEntry } from './pb/ipns.ts'
+import { unmarshalIPNSRecord } from './utils.ts'
 
 /**
  * Selects the latest valid IPNS record from an array of marshalled IPNS records.
diff --git a/src/utils.ts b/src/utils.ts
index fe27d65..d7e3c36 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -9,9 +9,9 @@ import { concat as uint8ArrayConcat } from 'uint8arrays/concat'
 import { equals as uint8ArrayEquals } from 'uint8arrays/equals'
 import { fromString as uint8ArrayFromString } from 'uint8arrays/from-string'
 import { toString as uint8ArrayToString } from 'uint8arrays/to-string'
-import { InvalidRecordDataError, InvalidValueError, SignatureVerificationError, UnsupportedValidityError } from './errors.js'
-import { IpnsEntry } from './pb/ipns.js'
-import type { IPNSRecord, IPNSRecordV2, IPNSRecordData } from './index.js'
+import { InvalidRecordDataError, InvalidValueError, SignatureVerificationError, UnsupportedValidityError } from './errors.ts'
+import { IpnsEntry } from './pb/ipns.ts'
+import type { IPNSRecord, IPNSRecordV2, IPNSRecordData } from './index.ts'
 import type { PublicKey } from '@libp2p/interface'
 import type { MultihashDigest } from 'multiformats/cid'
 
diff --git a/src/validator.ts b/src/validator.ts
index bb1ca4e..840fdb2 100644
--- a/src/validator.ts
+++ b/src/validator.ts
@@ -2,10 +2,10 @@ import { publicKeyFromMultihash } from '@libp2p/crypto/keys'
 import { logger } from '@libp2p/logger'
 import NanoDate from 'timestamp-nano'
 import { equals as uint8ArrayEquals } from 'uint8arrays/equals'
-import { InvalidEmbeddedPublicKeyError, RecordExpiredError, RecordTooLargeError, SignatureVerificationError, UnsupportedValidityError } from './errors.js'
-import { IpnsEntry } from './pb/ipns.js'
-import { extractPublicKeyFromIPNSRecord, ipnsRecordDataForV2Sig, isCodec, multihashFromIPNSRoutingKey, multihashToIPNSRoutingKey, unmarshalIPNSRecord } from './utils.js'
-import type { IPNSRecord } from './index.js'
+import { InvalidEmbeddedPublicKeyError, RecordExpiredError, RecordTooLargeError, SignatureVerificationError, UnsupportedValidityError } from './errors.ts'
+import { IpnsEntry } from './pb/ipns.ts'
+import { extractPublicKeyFromIPNSRecord, ipnsRecordDataForV2Sig, isCodec, multihashFromIPNSRoutingKey, multihashToIPNSRoutingKey, unmarshalIPNSRecord } from './utils.ts'
+import type { IPNSRecord } from './index.ts'
 import type { PublicKey } from '@libp2p/interface'
 
 const log = logger('ipns:validator')
diff --git a/test/index.spec.ts b/test/index.spec.ts
index 9f3a89e..88c8879 100644
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -16,7 +16,7 @@ import { createIPNSRecord, createIPNSRecordWithExpiration } from '../src/index.j
 import { IpnsEntry } from '../src/pb/ipns.js'
 import { extractPublicKeyFromIPNSRecord, parseCborData, createCborData, ipnsRecordDataForV2Sig, marshalIPNSRecord, unmarshalIPNSRecord, multihashToIPNSRoutingKey, multihashFromIPNSRoutingKey } from '../src/utils.js'
 import { ipnsValidator } from '../src/validator.js'
-import { kuboRecord } from './fixtures/records.js'
+import { kuboRecord } from './fixtures/records.ts'
 import type { PrivateKey } from '@libp2p/interface'
 
 describe('ipns', function () {