diff --git a/pom.xml b/pom.xml
index cf47f8aa6..863312c99 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,19 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xmlns="http://maven.apache.org/POM/4.0.0"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.samples</groupId>
   <artifactId>spring-petclinic</artifactId>
-  <version>3.2.0-SNAPSHOT</version>
+  <version>3.1.0-SNAPSHOT</version>
 
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.2.1</version>
+    <version>3.1.3</version>
   </parent>
   <name>petclinic</name>
 
+  <packaging>war</packaging>
+
   <properties>
 
     <!-- Generic properties -->
@@ -24,16 +24,16 @@
     <project.build.outputTimestamp>2023-05-10T07:42:50Z</project.build.outputTimestamp>
 
     <!-- Web dependencies -->
-    <webjars-bootstrap.version>5.3.2</webjars-bootstrap.version>
+    <webjars-bootstrap.version>5.2.3</webjars-bootstrap.version>
     <webjars-font-awesome.version>4.7.0</webjars-font-awesome.version>
 
-    <checkstyle.version>10.12.5</checkstyle.version>
-    <jacoco.version>0.8.11</jacoco.version>
+    <checkstyle.version>10.11.0</checkstyle.version>
+    <jacoco.version>0.8.10</jacoco.version>
     <libsass.version>0.2.29</libsass.version>
     <lifecycle-mapping>1.0.0</lifecycle-mapping>
-    <maven-checkstyle.version>3.3.1</maven-checkstyle.version>
+    <maven-checkstyle.version>3.2.2</maven-checkstyle.version>
     <nohttp-checkstyle.version>0.0.11</nohttp-checkstyle.version>
-    <spring-format.version>0.0.40</spring-format.version>
+    <spring-format.version>0.0.39</spring-format.version>
 
   </properties>
 
@@ -86,7 +86,7 @@
       <scope>runtime</scope>
     </dependency>
 
-    <!-- Caching -->
+    <!-- caching -->
     <dependency>
       <groupId>javax.cache</groupId>
       <artifactId>cache-api</artifactId>
@@ -96,7 +96,7 @@
       <artifactId>caffeine</artifactId>
     </dependency>
 
-    <!-- Webjars -->
+    <!-- webjars -->
     <dependency>
       <groupId>org.webjars.npm</groupId>
       <artifactId>bootstrap</artifactId>
@@ -107,6 +107,7 @@
       <artifactId>font-awesome</artifactId>
       <version>${webjars-font-awesome.version}</version>
     </dependency>
+    <!-- end of webjars -->
 
     <dependency>
       <groupId>org.springframework.boot</groupId>
@@ -141,6 +142,18 @@
 
   </dependencies>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.testcontainers</groupId>
+        <artifactId>testcontainers-bom</artifactId>
+        <version>${testcontainers.version}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <build>
     <plugins>
       <plugin>
@@ -198,12 +211,10 @@
             <phase>validate</phase>
             <configuration>
               <configLocation>src/checkstyle/nohttp-checkstyle.xml</configLocation>
+              <suppressionsLocation>src/checkstyle/nohttp-checkstyle-suppressions.xml</suppressionsLocation>
               <sourceDirectories>${basedir}</sourceDirectories>
               <includes>**/*</includes>
               <excludes>**/.git/**/*,**/.idea/**/*,**/target/**/,**/.flattened-pom.xml,**/*.class</excludes>
-              <propertyExpansion>
-                config_loc=${basedir}/src/checkstyle/
-              </propertyExpansion>
             </configuration>
             <goals>
               <goal>check</goal>
@@ -220,7 +231,7 @@
         <artifactId>spring-boot-maven-plugin</artifactId>
         <executions>
           <execution>
-            <!-- Spring Boot Actuator displays build-related information 
+            <!-- Spring Boot Actuator displays build-related information
               if a META-INF/build-info.properties file is present -->
             <goals>
               <goal>build-info</goal>
@@ -361,8 +372,7 @@
             <configuration>
               <inputPath>${basedir}/src/main/scss/</inputPath>
               <outputPath>${basedir}/src/main/resources/static/resources/css/</outputPath>
-              <includePath>
-                ${project.build.directory}/webjars/META-INF/resources/webjars/bootstrap/${webjars-bootstrap.version}/scss/</includePath>
+              <includePath>${project.build.directory}/webjars/META-INF/resources/webjars/bootstrap/${webjars-bootstrap.version}/scss/</includePath>
             </configuration>
           </plugin>
         </plugins>
@@ -378,8 +388,8 @@
       <build>
         <pluginManagement>
           <plugins>
-            <!-- This plugin's configuration is used to store Eclipse m2e settings 
-              only. It has no influence on the Maven build itself. -->
+            <!-- This plugin's configuration is used to store Eclipse m2e settings
+   only. It has no influence on the Maven build itself. -->
             <plugin>
               <groupId>org.eclipse.m2e</groupId>
               <artifactId>lifecycle-mapping</artifactId>
@@ -436,4 +446,4 @@
     </profile>
   </profiles>
 
-</project>
\ No newline at end of file
+</project>