diff --git a/build.gradle b/build.gradle
index c986cd3f..edfcb2df 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ buildscript {
 		snapshotBuild = version.endsWith('SNAPSHOT')
 		milestoneBuild = !(releaseBuild || snapshotBuild)
 
-		springBootVersion = '2.5.5'
+		springBootVersion = '3.0.0-SNAPSHOT'
 	}
 
 	repositories {
diff --git a/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/java/sample/session/SessionDetailsFilter.java b/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/java/sample/session/SessionDetailsFilter.java
index 1aff9d74..fd599cc9 100644
--- a/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/java/sample/session/SessionDetailsFilter.java
+++ b/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/java/sample/session/SessionDetailsFilter.java
@@ -19,11 +19,11 @@ package sample.session;
 import java.io.IOException;
 import java.net.InetAddress;
 
-import javax.servlet.FilterChain;
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpSession;
 
 import com.maxmind.geoip2.DatabaseReader;
 import com.maxmind.geoip2.model.CityResponse;
diff --git a/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/resources/templates/index.html b/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/resources/templates/index.html
index 6d37087d..c950d816 100644
--- a/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/resources/templates/index.html
+++ b/spring-session-samples/spring-session-sample-boot-findbyusername/src/main/resources/templates/index.html
@@ -21,8 +21,8 @@
 			<tr th:each="sessionElement : ${sessions}" th:with="details=${sessionElement.getAttribute('SESSION_DETAILS')}">
 				<td th:text="${sessionElement.id.substring(30)}"></td>
 				<td th:text="${details?.location}"></td>
-				<td th:text="${#temporals.format(sessionElement.creationTime.atZone(T(java.time.ZoneId).systemDefault()),'dd/MMM/yyyy HH:mm:ss')}"></td>
-				<td th:text="${#temporals.format(sessionElement.lastAccessedTime.atZone(T(java.time.ZoneId).systemDefault()),'dd/MMM/yyyy HH:mm:ss')}"></td>
+				<td th:text="${#dates.format(sessionElement.creationTime,'dd/MMM/yyyy HH:mm:ss')}"></td>
+				<td th:text="${#dates.format(sessionElement.lastAccessedTime,'dd/MMM/yyyy HH:mm:ss')}"></td>
 				<td th:text="${details?.accessType}"></td>
 				<td>
 					<form th:action="@{'/sessions/' + ${sessionElement.id}}" th:method="post">
diff --git a/spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/application.yml b/spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/application.yml
index 5ff2265b..c412cf95 100644
--- a/spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/application.yml
+++ b/spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/application.yml
@@ -2,3 +2,7 @@ logging:
   level:
     org.springframework.data.mongodb: DEBUG
     org.springframework.session: DEBUG
+spring:
+  mongodb:
+    embedded:
+      version: 3.4.3
diff --git a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/spring-session-sample-boot-mongodb-traditional.gradle b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/spring-session-sample-boot-mongodb-traditional.gradle
index 79e19b78..090ad5d0 100644
--- a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/spring-session-sample-boot-mongodb-traditional.gradle
+++ b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/spring-session-sample-boot-mongodb-traditional.gradle
@@ -5,7 +5,7 @@ dependencies {
     implementation  "org.springframework.boot:spring-boot-starter-web"
     implementation  "org.springframework.boot:spring-boot-starter-thymeleaf"
     implementation  "nz.net.ultraq.thymeleaf:thymeleaf-layout-dialect"
-    implementation  "org.thymeleaf.extras:thymeleaf-extras-springsecurity5"
+    implementation  "org.thymeleaf.extras:thymeleaf-extras-springsecurity6"
     implementation "org.springframework.boot:spring-boot-starter-data-mongodb"
     implementation "org.springframework.boot:spring-boot-starter-security"
     implementation "de.flapdoodle.embed:de.flapdoodle.embed.mongo"
diff --git a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/application.properties b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/application.properties
index 51ab5db5..45d08779 100644
--- a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/application.properties
+++ b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/application.properties
@@ -1,3 +1,4 @@
 spring.thymeleaf.cache=false
 spring.template.cache=false
 spring.data.mongodb.port=0
+spring.mongodb.embedded.version=3.4.3
diff --git a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/index.html b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/index.html
index 4d653a1c..b9051413 100644
--- a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/index.html
+++ b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/index.html
@@ -1,4 +1,4 @@
-<html xmlns:layout="https://github.com/ultraq/thymeleaf-layout-dialect" layout:decorator="layout">
+<html xmlns:layout="https://github.com/ultraq/thymeleaf-layout-dialect" layout:decorate="layout">
 <head>
 	<title>Secured Content</title>
 </head>
diff --git a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/layout.html b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/layout.html
index 8f6a961c..e0c8f1db 100644
--- a/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/layout.html
+++ b/spring-session-samples/spring-session-sample-boot-mongodb-traditional/src/main/resources/templates/layout.html
@@ -3,7 +3,7 @@
 			xmlns:th="https://www.thymeleaf.org"
 			xmlns:layout="https://github.com/ultraq/thymeleaf-layout-dialect">
 	<head>
-		<title layout:title-pattern="$DECORATOR_TITLE - $CONTENT_TITLE">Spring Session Sample</title>
+		<title layout:title-pattern="$LAYOUT_TITLE - $CONTENT_TITLE">Spring Session Sample</title>
 		<link rel="icon" type="image/x-icon" th:href="@{/resources/img/favicon.ico}" href="../static/img/favicon.ico"/>
 		<link th:href="@{/webjars/bootstrap/css/bootstrap.min.css}" href="/webjars/bootstrap/css/bootstrap.min.css" rel="stylesheet"></link>
 		<style type="text/css">
diff --git a/spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/web/HomeController.java b/spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/web/HomeController.java
index 9fcdb335..81d14db1 100644
--- a/spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/web/HomeController.java
+++ b/spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/web/HomeController.java
@@ -16,7 +16,7 @@
 
 package sample.web;
 
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
 
 import org.springframework.stereotype.Controller;
 import org.springframework.util.ObjectUtils;
diff --git a/spring-session-samples/spring-session-sample-boot-websocket/src/main/java/sample/data/User.java b/spring-session-samples/spring-session-sample-boot-websocket/src/main/java/sample/data/User.java
index c4cb4bf2..0e4f6dee 100644
--- a/spring-session-samples/spring-session-sample-boot-websocket/src/main/java/sample/data/User.java
+++ b/spring-session-samples/spring-session-sample-boot-websocket/src/main/java/sample/data/User.java
@@ -18,13 +18,13 @@ package sample.data;
 
 import java.io.Serializable;
 
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
-import javax.persistence.Id;
-import javax.validation.constraints.Email;
-import javax.validation.constraints.NotEmpty;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotEmpty;
 
 import org.springframework.security.crypto.password.PasswordEncoder;