If you are using Spring Boot, you need just the following dependencies:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
 
<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-springsecurity4</artifactId>
    <version>2.1.2.RELEASE</version>
</dependency>

Also in your templates add spring-security namespace xmlns:sec="http://www.thymeleaf.org/extras/spring-security" and use hasRole instead of hasAuthority value in <sec:authorize> tag:

<div sec:authorize="hasRole('ROLE_ADMIN')">
    ...
</div>

If you use Spring Boot 2.0.0.RELEASE:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

you need just the following dependencies:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-springsecurity4</artifactId>
</dependency>

Version of thymeleaf-extras-springsecurity4 will be inherited from the spring-boot-starter-parent and would be 3.0.2.RELEASE.

Thanks to @yglodt for pointing this out.

Also in your templates add spring-security namespace xmlns:sec="http://www.thymeleaf.org/extras/spring-security" and use hasRole instead of hasAuthority value in <sec:authorize> tag:

<div sec:authorize="hasRole('ROLE_ADMIN')">
    ...
</div>