diff --git a/Sources/tart/OCI/Registry.swift b/Sources/tart/OCI/Registry.swift
index 083ea52..4a9ebe0 100644
--- a/Sources/tart/OCI/Registry.swift
+++ b/Sources/tart/OCI/Registry.swift
@@ -69,12 +69,15 @@ struct TokenResponse: Decodable, Authentication {
     let dateFormatter = ISO8601DateFormatter()
     dateFormatter.formatOptions = [.withInternetDateTime]
     dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
+    let fractionalDateFormatter = ISO8601DateFormatter()
+    fractionalDateFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+    fractionalDateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
 
     decoder.dateDecodingStrategy = .custom { decoder in
       let container = try decoder.singleValueContainer()
       let dateString = try container.decode(String.self)
 
-      return dateFormatter.date(from: dateString) ?? Date()
+      return dateFormatter.date(from: dateString) ?? fractionalDateFormatter.date(from: dateString) ?? Date()
     }
 
     var response = try decoder.decode(TokenResponse.self, from: fromData)
diff --git a/Tests/TartTests/TokenResponseTests.swift b/Tests/TartTests/TokenResponseTests.swift
index 6eb5ae2..91326b6 100644
--- a/Tests/TartTests/TokenResponseTests.swift
+++ b/Tests/TartTests/TokenResponseTests.swift
@@ -2,6 +2,17 @@ import XCTest
 @testable import tart
 
 final class TokenResponseTests: XCTestCase {
+  func testFractionalIssuedAt() throws {
+    for timestamp in ["1970-01-01T00:00:00.125Z", "1970-01-01T01:30:00.125+01:30", "1970-01-01T00:00:00.125000000Z"] {
+      let data = Data("{\"token\":\"test-token\",\"expires_in\":3600,\"issued_at\":\"\(timestamp)\"}".utf8)
+      let response = try TokenResponse.parse(fromData: data)
+
+      XCTAssertEqual(response.issuedAt!.timeIntervalSince1970, 0.125, accuracy: 0.0001)
+      XCTAssertEqual(response.tokenExpiresAt.timeIntervalSince1970, 3600.125, accuracy: 0.0001)
+      XCTAssertFalse(response.isValid())
+    }
+  }
+
   func testBasic() throws {
     var expectedTokenExpiresAtRange = DateInterval()
     let tokenResponseRaw = Data("{\"token\":\"some token\"}".utf8)