diff --git a/src/control.ts b/src/control.ts
index a45163b..09fc763 100644
--- a/src/control.ts
+++ b/src/control.ts
@@ -7,7 +7,7 @@
  */
 import { decodeTicket } from './decoder';
 import { verifyLevel1Signature, verifyLevel2Signature } from './verifier';
-import { getIssuingTime, getEndOfValidityTime, getDynamicContentTime } from './time-helpers';
+import { getEndOfValidityTime, getDynamicContentTime } from './time-helpers';
 import type {
   UicBarcodeTicket,
   UicRailTicketData,
diff --git a/src/decoder.ts b/src/decoder.ts
index 4cbb6ae..8c0f28e 100644
--- a/src/decoder.ts
+++ b/src/decoder.ts
@@ -27,7 +27,6 @@ import type {
   Level1Data,
   DataSequenceEntry,
   Level2Data,
-  ExtensionData,
 } from './types';
 
 // ---------------------------------------------------------------------------
diff --git a/src/signed-data.ts b/src/signed-data.ts
index 8cc1457..a0901f1 100644
--- a/src/signed-data.ts
+++ b/src/signed-data.ts
@@ -8,11 +8,9 @@ import {
   SchemaCodec,
   SchemaBuilder,
   BitBuffer,
-  stripMetadata,
   type SchemaNode,
   type DecodedNode,
 } from 'asn1-per-ts';
-import type { Codec } from 'asn1-per-ts';
 import { HEADER_SCHEMAS } from './schemas';
 
 // ---------------------------------------------------------------------------
diff --git a/src/verifier.ts b/src/verifier.ts
index 39886b5..7e02cf7 100644
--- a/src/verifier.ts
+++ b/src/verifier.ts
@@ -10,7 +10,7 @@
 import { p256, p384, p521 } from '@noble/curves/nist.js';
 
 import { extractSignedData } from './signed-data';
-import { getSigningAlgorithm, getKeyAlgorithm, curveComponentLength } from './oids';
+import { getSigningAlgorithm, getKeyAlgorithm } from './oids';
 import { derToRaw, extractEcPublicKeyPoint } from './signature-utils';
 import type {
   SignatureVerificationResult,
diff --git a/tests/verifier.test.ts b/tests/verifier.test.ts
index 0ddce3f..8a7b4f9 100644
--- a/tests/verifier.test.ts
+++ b/tests/verifier.test.ts
@@ -1,6 +1,5 @@
 import {
   verifyLevel2Signature,
-  verifyLevel1Signature,
   verifySignatures,
   extractSignedData,
   decodeTicket,