diff --git a/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java b/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java
index b0ec5db23..15d6d8e4f 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,8 @@ import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Repository class for <code>Pet</code> domain objects All method names are compliant with Spring Data naming
- * conventions so this interface can easily be extended for Spring Data See here: http://static.springsource.org/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.query-methods.query-creation
+ * conventions so this interface can easily be extended for Spring Data.
+ * See: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-creation
  *
  * @author Ken Krebs
  * @author Juergen Hoeller
diff --git a/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java b/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java
index 20863ce76..c598e5f3d 100644
--- a/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,7 +24,8 @@ import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Repository class for <code>Vet</code> domain objects All method names are compliant with Spring Data naming
- * conventions so this interface can easily be extended for Spring Data See here: http://static.springsource.org/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.query-methods.query-creation
+ * conventions so this interface can easily be extended for Spring Data.
+ * See: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-creation
  *
  * @author Ken Krebs
  * @author Juergen Hoeller
diff --git a/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java b/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java
index c7853d170..0a37796b7 100644
--- a/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,8 @@ import org.springframework.samples.petclinic.model.BaseEntity;
 
 /**
  * Repository class for <code>Visit</code> domain objects All method names are compliant with Spring Data naming
- * conventions so this interface can easily be extended for Spring Data See here: http://static.springsource.org/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.query-methods.query-creation
+ * conventions so this interface can easily be extended for Spring Data.
+ * See: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-creation
  *
  * @author Ken Krebs
  * @author Juergen Hoeller
diff --git a/src/main/resources/templates/error.html b/src/main/resources/templates/error.html
index 2b40d7f98..b9026690e 100644
--- a/src/main/resources/templates/error.html
+++ b/src/main/resources/templates/error.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<html xmlns:th="http://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'error')}">
+<html xmlns:th="https://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'error')}">
 
   <body>
     <img src="../static/resources/images/pets.png" th:src="@{/resources/images/pets.png}"/>
diff --git a/src/main/resources/templates/owners/createOrUpdateOwnerForm.html b/src/main/resources/templates/owners/createOrUpdateOwnerForm.html
index ca22d9de1..c835f8ccb 100644
--- a/src/main/resources/templates/owners/createOrUpdateOwnerForm.html
+++ b/src/main/resources/templates/owners/createOrUpdateOwnerForm.html
@@ -1,4 +1,4 @@
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
 <body>
diff --git a/src/main/resources/templates/owners/findOwners.html b/src/main/resources/templates/owners/findOwners.html
index 982be5e81..134e687fd 100644
--- a/src/main/resources/templates/owners/findOwners.html
+++ b/src/main/resources/templates/owners/findOwners.html
@@ -1,4 +1,4 @@
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
 <body>
diff --git a/src/main/resources/templates/owners/ownerDetails.html b/src/main/resources/templates/owners/ownerDetails.html
index ed89462b3..fa2b71ee9 100644
--- a/src/main/resources/templates/owners/ownerDetails.html
+++ b/src/main/resources/templates/owners/ownerDetails.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
   <body>
diff --git a/src/main/resources/templates/owners/ownersList.html b/src/main/resources/templates/owners/ownersList.html
index 478b37e5d..acf7e02d0 100644
--- a/src/main/resources/templates/owners/ownersList.html
+++ b/src/main/resources/templates/owners/ownersList.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<html xmlns:th="http://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
+<html xmlns:th="https://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
   <body>
 
diff --git a/src/main/resources/templates/pets/createOrUpdatePetForm.html b/src/main/resources/templates/pets/createOrUpdatePetForm.html
index a0c182aa5..af87f3876 100644
--- a/src/main/resources/templates/pets/createOrUpdatePetForm.html
+++ b/src/main/resources/templates/pets/createOrUpdatePetForm.html
@@ -1,4 +1,4 @@
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
 <body>
diff --git a/src/main/resources/templates/pets/createOrUpdateVisitForm.html b/src/main/resources/templates/pets/createOrUpdateVisitForm.html
index 609a735f9..d7589c3bc 100644
--- a/src/main/resources/templates/pets/createOrUpdateVisitForm.html
+++ b/src/main/resources/templates/pets/createOrUpdateVisitForm.html
@@ -1,4 +1,4 @@
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'owners')}">
 
 <body>
diff --git a/src/main/resources/templates/vets/vetList.html b/src/main/resources/templates/vets/vetList.html
index 1961ad405..4fc961793 100644
--- a/src/main/resources/templates/vets/vetList.html
+++ b/src/main/resources/templates/vets/vetList.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<html xmlns:th="http://www.thymeleaf.org"
+<html xmlns:th="https://www.thymeleaf.org"
   th:replace="~{fragments/layout :: layout (~{::body},'vets')}">
 
 <body>
diff --git a/src/main/resources/templates/welcome.html b/src/main/resources/templates/welcome.html
index 6b4ff0480..4fa1cd328 100644
--- a/src/main/resources/templates/welcome.html
+++ b/src/main/resources/templates/welcome.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 
-<html xmlns:th="http://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'home')}">
+<html xmlns:th="https://www.thymeleaf.org" th:replace="~{fragments/layout :: layout (~{::body},'home')}">
 
   <body>