diff --git a/TINetworking/Sources/Alamofire/FingerprintsTrustEvaluation/DefaultFingerprintsProvider.swift b/TINetworking/Sources/Alamofire/FingerprintsTrustEvaluation/DefaultFingerprintsProvider.swift
index e5877e29..f4a61d45 100644
--- a/TINetworking/Sources/Alamofire/FingerprintsTrustEvaluation/DefaultFingerprintsProvider.swift
+++ b/TINetworking/Sources/Alamofire/FingerprintsTrustEvaluation/DefaultFingerprintsProvider.swift
@@ -34,6 +34,10 @@ open class DefaultFingerprintsProvider: FingerprintsProvider {
         if settingsStorage.shouldResetFingerprints {
             self.secureStorage.knownPins = bundledFingerprints
             self.settingsStorage.shouldResetFingerprints = false
+        } else {
+            self.secureStorage.knownPins.merge(bundledFingerprints) { storedFingerprints, bundleFingerprints in
+                storedFingerprints.union(bundleFingerprints)
+            }
         }
     }