diff --git a/core/src/main/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java b/core/src/main/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
index a8e201a97..285e9692c 100644
--- a/core/src/main/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
+++ b/core/src/main/java/google/registry/ui/server/registrar/RegistrarSettingsAction.java
@@ -240,11 +240,18 @@ public class RegistrarSettingsAction implements Runnable, JsonActionRunner.JsonA
             });
   }
 
-  private Map<String, Object> expandRegistrarWithContacts(Iterable<RegistrarContact> contacts,
-                                                          Registrar registrar) {
+  private Map<String, Object> expandRegistrarWithContacts(
+      Iterable<RegistrarContact> contacts, Registrar registrar) {
     ImmutableSet<Map<String, Object>> expandedContacts =
         Streams.stream(contacts)
             .map(RegistrarContact::toDiffableFieldMap)
+            // Note: per the javadoc, toDiffableFieldMap includes sensitive data but we don't want
+            // to display it here
+            .peek(
+                map -> {
+                  map.remove("registryLockPasswordHash");
+                  map.remove("registryLockPasswordSalt");
+                })
             .collect(toImmutableSet());
     // Use LinkedHashMap here to preserve ordering; null values mean we can't use ImmutableMap.
     LinkedHashMap<String, Object> result = new LinkedHashMap<>(registrar.toDiffableFieldMap());
diff --git a/core/src/test/resources/google/registry/ui/server/registrar/update_registrar_email.txt b/core/src/test/resources/google/registry/ui/server/registrar/update_registrar_email.txt
index 0fe61c218..e1b2cf009 100644
--- a/core/src/test/resources/google/registry/ui/server/registrar/update_registrar_email.txt
+++ b/core/src/test/resources/google/registry/ui/server/registrar/update_registrar_email.txt
@@ -11,9 +11,9 @@ emailAddress: the.registrar@example.com -> thase@the.registrar
 url: http://my.fake.url -> http://my.new.url
 contacts:
     ADDED:
-        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Extra Terrestrial, emailAddress=etphonehome@example.com, phoneNumber=+1.2345678901, faxNumber=null, types=[ADMIN, BILLING, TECH, WHOIS], gaeUserId=null, visibleInWhoisAsAdmin=true, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false, registryLockPasswordHash=null, registryLockPasswordSalt=null}
+        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Extra Terrestrial, emailAddress=etphonehome@example.com, phoneNumber=+1.2345678901, faxNumber=null, types=[ADMIN, BILLING, TECH, WHOIS], gaeUserId=null, visibleInWhoisAsAdmin=true, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false}
     REMOVED:
-        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=John Doe, emailAddress=johndoe@theregistrar.com, phoneNumber=+1.1234567890, faxNumber=null, types=[ADMIN], gaeUserId=31337, visibleInWhoisAsAdmin=false, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false, registryLockPasswordHash=null, registryLockPasswordSalt=null},
-        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Jian-Yang, emailAddress=jyang@bachman.accelerator, phoneNumber=+1.1234567890, faxNumber=null, types=[TECH], gaeUserId=null, visibleInWhoisAsAdmin=false, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false, registryLockPasswordHash=null, registryLockPasswordSalt=null}
+        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=John Doe, emailAddress=johndoe@theregistrar.com, phoneNumber=+1.1234567890, faxNumber=null, types=[ADMIN], gaeUserId=31337, visibleInWhoisAsAdmin=false, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false},
+        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Jian-Yang, emailAddress=jyang@bachman.accelerator, phoneNumber=+1.1234567890, faxNumber=null, types=[TECH], gaeUserId=null, visibleInWhoisAsAdmin=false, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false}
     FINAL CONTENTS:
-        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Extra Terrestrial, emailAddress=etphonehome@example.com, phoneNumber=+1.2345678901, faxNumber=null, types=[ADMIN, BILLING, TECH, WHOIS], gaeUserId=null, visibleInWhoisAsAdmin=true, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false, registryLockPasswordHash=null, registryLockPasswordSalt=null}
+        {parent=Key<?>(EntityGroupRoot("cross-tld")/Registrar("TheRegistrar")), name=Extra Terrestrial, emailAddress=etphonehome@example.com, phoneNumber=+1.2345678901, faxNumber=null, types=[ADMIN, BILLING, TECH, WHOIS], gaeUserId=null, visibleInWhoisAsAdmin=true, visibleInWhoisAsTech=false, visibleInDomainWhoisAsAbuse=false, allowedToSetRegistryLockPassword=false}