diff --git a/packages/node-opcua-crypto-test/test/test_create_certificate_signing_request.ts b/packages/node-opcua-crypto-test/test/test_create_certificate_signing_request.ts
index 606f756..ea60049 100644
--- a/packages/node-opcua-crypto-test/test/test_create_certificate_signing_request.ts
+++ b/packages/node-opcua-crypto-test/test/test_create_certificate_signing_request.ts
@@ -21,9 +21,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import fs from "fs";
-import path from "path";
-import os from "os";
+import fs from "node:fs";
+import path from "node:path";
+import os from "node:os";
 
 import "should";
 
diff --git a/packages/node-opcua-crypto-test/test/test_create_key_pair.ts b/packages/node-opcua-crypto-test/test/test_create_key_pair.ts
index 2ebd00b..c1b88bc 100644
--- a/packages/node-opcua-crypto-test/test/test_create_key_pair.ts
+++ b/packages/node-opcua-crypto-test/test/test_create_key_pair.ts
@@ -21,9 +21,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import fs from "fs";
-import path from "path";
-import os from "os";
+import fs from "node:fs";
+import path from "node:path";
+import os from "node:os";
 import should from "should";
 
 import {
diff --git a/packages/node-opcua-crypto-test/test/test_create_self_signed_certificate.ts b/packages/node-opcua-crypto-test/test/test_create_self_signed_certificate.ts
index 8ae894c..1d2736a 100644
--- a/packages/node-opcua-crypto-test/test/test_create_self_signed_certificate.ts
+++ b/packages/node-opcua-crypto-test/test/test_create_self_signed_certificate.ts
@@ -21,10 +21,10 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import fs from "fs";
-import path from "path";
-import os from "os";
-import util from "util";
+import fs from "node:fs";
+import path from "node:path";
+import os from "node:os";
+import util from "node:util";
 import should from "should";
 import x509 from "@peculiar/x509";
 import {
diff --git a/packages/node-opcua-crypto-test/test/test_crypto.ts b/packages/node-opcua-crypto-test/test/test_crypto.ts
index 135b5f8..6565f76 100644
--- a/packages/node-opcua-crypto-test/test/test_crypto.ts
+++ b/packages/node-opcua-crypto-test/test/test_crypto.ts
@@ -22,6 +22,8 @@
 // ---------------------------------------------------------------------------------------------------------------------
 
 import assert from "assert";
+import fs from "node:fs";
+import path from "node:path";
 import {
     createHmac,
     createCipheriv,
@@ -32,9 +34,7 @@ import {
     publicEncrypt as publicEncrypt_fromCrypto,
     randomBytes,
     KeyObject,
-} from "crypto";
-import fs from "fs";
-import path from "path";
+} from "node:crypto";
 import should from "should";
 import * as loremIpsum1 from "lorem-ipsum";
 
diff --git a/packages/node-opcua-crypto-test/test/test_crypto_explore_certificate.ts b/packages/node-opcua-crypto-test/test/test_crypto_explore_certificate.ts
index c0d2f34..879c6e1 100644
--- a/packages/node-opcua-crypto-test/test/test_crypto_explore_certificate.ts
+++ b/packages/node-opcua-crypto-test/test/test_crypto_explore_certificate.ts
@@ -22,8 +22,8 @@
 // ---------------------------------------------------------------------------------------------------------------------
 
 import should from "should";
-import path from "path";
-import fs from "fs";
+import path from "node:path";
+import fs from "node:fs";
 
 import {
     readCertificate,
diff --git a/packages/node-opcua-crypto-test/test/test_crypto_utils.ts b/packages/node-opcua-crypto-test/test/test_crypto_utils.ts
index b545807..731d5e9 100644
--- a/packages/node-opcua-crypto-test/test/test_crypto_utils.ts
+++ b/packages/node-opcua-crypto-test/test/test_crypto_utils.ts
@@ -21,9 +21,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import fs from "fs";
-import os from "os";
-import path from "path";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
 
 import * as loremIpsum from "lorem-ipsum";
 import "should";
diff --git a/packages/node-opcua-crypto-test/test/test_explore_crl.ts b/packages/node-opcua-crypto-test/test/test_explore_crl.ts
index aa89d5f..f93df26 100644
--- a/packages/node-opcua-crypto-test/test/test_explore_crl.ts
+++ b/packages/node-opcua-crypto-test/test/test_explore_crl.ts
@@ -21,7 +21,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
+import path from "node:path";
 import {
     verifyCertificateRevocationListSignature,
     exploreCertificateRevocationList,
diff --git a/packages/node-opcua-crypto-test/test/test_explore_csr.ts b/packages/node-opcua-crypto-test/test/test_explore_csr.ts
index 882ed46..3b39d75 100644
--- a/packages/node-opcua-crypto-test/test/test_explore_csr.ts
+++ b/packages/node-opcua-crypto-test/test/test_explore_csr.ts
@@ -21,7 +21,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
+import path from "node:path";
 import { exploreCertificateSigningRequest } from "node-opcua-crypto";
 
 import { readCertificateSigningRequest } from "node-opcua-crypto";
diff --git a/packages/node-opcua-crypto-test/test/test_explore_private_key.ts b/packages/node-opcua-crypto-test/test/test_explore_private_key.ts
index b6fbf40..db63cc8 100644
--- a/packages/node-opcua-crypto-test/test/test_explore_private_key.ts
+++ b/packages/node-opcua-crypto-test/test/test_explore_private_key.ts
@@ -21,7 +21,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
+import path from "node:path";
 import { explorePrivateKey } from "node-opcua-crypto";
 import { readPrivateRsaKey, readPrivateKey } from "node-opcua-crypto";
 import "should";
diff --git a/packages/node-opcua-crypto-test/test/test_extKeyUsage.ts b/packages/node-opcua-crypto-test/test/test_extKeyUsage.ts
index 03b89e2..17cf8b2 100644
--- a/packages/node-opcua-crypto-test/test/test_extKeyUsage.ts
+++ b/packages/node-opcua-crypto-test/test/test_extKeyUsage.ts
@@ -21,9 +21,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
-import { exploreCertificate, readCertificate } from "node-opcua-crypto";
+import path from "node:path";
 import should from "should";
+import { exploreCertificate, readCertificate } from "node-opcua-crypto";
 
 describe("X509ExtKeyUsage", () => {
     it("should parse extKeyUsage 1", () => {
diff --git a/packages/node-opcua-crypto-test/test/test_makeThumprint.ts b/packages/node-opcua-crypto-test/test/test_makeThumprint.ts
index 08470ec..9529ec0 100644
--- a/packages/node-opcua-crypto-test/test/test_makeThumprint.ts
+++ b/packages/node-opcua-crypto-test/test/test_makeThumprint.ts
@@ -21,7 +21,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
+import path from "node:path";
 import { makeSHA1Thumbprint } from "node-opcua-crypto";
 import { readCertificate } from "node-opcua-crypto";
 
diff --git a/packages/node-opcua-crypto-test/test/test_make_private_key_from_pem.ts b/packages/node-opcua-crypto-test/test/test_make_private_key_from_pem.ts
index 9eea17c..152ea68 100644
--- a/packages/node-opcua-crypto-test/test/test_make_private_key_from_pem.ts
+++ b/packages/node-opcua-crypto-test/test/test_make_private_key_from_pem.ts
@@ -1,4 +1,4 @@
-import path from "path";
+import path from "node:path";
 import "should";
 import {
     makePrivateKeyFromPem,
diff --git a/packages/node-opcua-crypto-test/test/test_peculiar_edge_case.ts b/packages/node-opcua-crypto-test/test/test_peculiar_edge_case.ts
index aea41fc..746acc0 100644
--- a/packages/node-opcua-crypto-test/test/test_peculiar_edge_case.ts
+++ b/packages/node-opcua-crypto-test/test/test_peculiar_edge_case.ts
@@ -1,6 +1,6 @@
-import path from "path";
-import fs from "fs";
-import { tmpdir } from "os";
+import path from "node:path";
+import fs from "node:fs";
+import { tmpdir } from "node:os";
 import { Crypto as PeculiarWebCrypto } from "@peculiar/webcrypto";
 import * as x509 from "@peculiar/x509";
 import { AsnConvert, AsnUtf8StringConverter } from "@peculiar/asn1-schema";
@@ -116,7 +116,7 @@ declare const window: any;
 
 const ignoreCrypto = process.env.IGNORE_SUBTLE_FROM_CRYPTO;
 
-import nativeCrypto from "crypto";
+import nativeCrypto from "node:crypto";
 
 if (typeof window === "undefined") {
     _crypto = nativeCrypto as any;
diff --git a/packages/node-opcua-crypto-test/test/test_private_public_key_match.ts b/packages/node-opcua-crypto-test/test/test_private_public_key_match.ts
index 4250da1..04654b0 100644
--- a/packages/node-opcua-crypto-test/test/test_private_public_key_match.ts
+++ b/packages/node-opcua-crypto-test/test/test_private_public_key_match.ts
@@ -21,7 +21,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
+import path from "node:path";
 import { exploreCertificate, explorePrivateKey } from "node-opcua-crypto";
 import { publicKeyAndPrivateKeyMatches, certificateMatchesPrivateKey } from "node-opcua-crypto";
 import { readCertificate, readPrivateKey } from "node-opcua-crypto";
diff --git a/packages/node-opcua-crypto-test/test/test_rsaLengthPublicKey.ts b/packages/node-opcua-crypto-test/test/test_rsaLengthPublicKey.ts
index 9eae28f..9f1dc4b 100644
--- a/packages/node-opcua-crypto-test/test/test_rsaLengthPublicKey.ts
+++ b/packages/node-opcua-crypto-test/test/test_rsaLengthPublicKey.ts
@@ -21,8 +21,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import { createPublicKey } from "crypto";
-import path from "path";
+import { createPublicKey } from "node:crypto";
+import path from "node:path";
 import { rsaLengthPublicKey } from "node-opcua-crypto";
 import { readCertificate, readCertificatePEM } from "node-opcua-crypto";
 
diff --git a/packages/node-opcua-crypto-test/test/test_verifyCertificateChain.ts b/packages/node-opcua-crypto-test/test/test_verifyCertificateChain.ts
index 2f008b7..49b8713 100644
--- a/packages/node-opcua-crypto-test/test/test_verifyCertificateChain.ts
+++ b/packages/node-opcua-crypto-test/test/test_verifyCertificateChain.ts
@@ -21,9 +21,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
-import { verifyCertificateChain } from "node-opcua-crypto";
-import { readCertificate } from "node-opcua-crypto";
+import path from "node:path";
+import { verifyCertificateChain, readCertificate } from "node-opcua-crypto";
 
 describe("Test Certificate Chain", () => {
     it("DX should verify a certificate chain", async () => {
diff --git a/packages/node-opcua-crypto-test/test/test_verify_certificate_signature.ts b/packages/node-opcua-crypto-test/test/test_verify_certificate_signature.ts
index 0396afc..4f9ab34 100644
--- a/packages/node-opcua-crypto-test/test/test_verify_certificate_signature.ts
+++ b/packages/node-opcua-crypto-test/test/test_verify_certificate_signature.ts
@@ -21,8 +21,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // ---------------------------------------------------------------------------------------------------------------------
 
-import path from "path";
-import { SignPrivateKeyInput, constants, createSign } from "crypto";
+import path from "node:path";
+import { SignPrivateKeyInput, constants, createSign } from "node:crypto";
 import { verifyCertificateSignature, Certificate, toPem2, PrivateKey } from "node-opcua-crypto";
 import { asn1 } from "node-opcua-crypto";
 import { readCertificate, readPrivateKey } from "node-opcua-crypto";