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 b0ec5db2396a966050cf542da3e61974af1c00f1..5ad150af7fbc4a797c6b9c6002e44540ebbe1b06 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/PetRepository.java
@@ -23,7 +23,7 @@ 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 here: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.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 20863ce767bc0e952c2180c48130a2851085152d..c3594feeec395f65b1171ace8648a940477703db 100644
--- a/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/vet/VetRepository.java
@@ -24,7 +24,7 @@ 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 here: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.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 c7853d170f3694fd4895fe298bab0be0b3f92170..25a117e9422061fd23422f9b71522de6948c76e6 100644
--- a/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java
+++ b/src/main/java/org/springframework/samples/petclinic/visit/VisitRepository.java
@@ -23,7 +23,7 @@ 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 here: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/jpa.repositories.html#jpa.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 2b40d7f98fd2b2e79d023713c1315704cd4b12bf..b9026690ec0fd176d039c541d3b6a0d8dff27d83 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 ca22d9de16417ca63b26b650dcf51e8167185b44..c835f8ccbe87e607c6f4c6be7b0464872fab98cc 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 982be5e81401e88eaa0fa4a9edefc0b4739bdfc5..134e687fd2cf5ceb1af24136432615008990224d 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 ed89462b339675c679f1d4f18036e7c4ddfd3121..fa2b71ee90de936f82d39cec31da32352e2054b1 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 478b37e5d6be3f72cfdff4686a389438341f62b4..acf7e02d09a81e6af3b6948527d53f8102a8168f 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 a0c182aa5362c859db44da16812adf4b05d7e7f2..af87f387622d125cf3bc034285bf4ee721908e8f 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 609a735f98c71b431dbf2f37200a6e834a3f0deb..d7589c3bc16e50d3b163475594eef443f2fab06d 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 1961ad40565ef2d6e81da77afdc78e59ac99483a..4fc9617930b1a18d80123350606a0a4730da32e1 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 6b4ff048062d6548b18de491ab251d5539c2a180..4fa1cd32855abf8f2e6797eb407c8a6446e1cd9b 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>