diff --git a/pet-sitter/12-ps-remoting-solution/pom.xml b/pet-sitter/12-ps-remoting-solution/pom.xml
index e13bb9de..b6fc6fd7 100644
--- a/pet-sitter/12-ps-remoting-solution/pom.xml
+++ b/pet-sitter/12-ps-remoting-solution/pom.xml
@@ -10,7 +10,7 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <spring.version>4.2.4.RELEASE</spring.version>
+        <spring.version>5.3.18</spring.version>
     </properties>
 
     <dependencies>
diff --git a/pet-sitter/pom.xml b/pet-sitter/pom.xml
index 0d19f333..5f909c03 100644
--- a/pet-sitter/pom.xml
+++ b/pet-sitter/pom.xml
@@ -12,7 +12,7 @@
     <properties>
         <hibernate.version>5.2.10.Final</hibernate.version>
         <javaee.version>7.0</javaee.version>
-        <spring.version>4.3.6.RELEASE</spring.version>
+        <spring.version>5.3.18</spring.version>
         <spring.security.version>4.1.3.RELEASE</spring.security.version>
         <spring.data.version>1.10.3.RELEASE</spring.data.version>
         <spring.mongodb.version>1.9.2.RELEASE</spring.mongodb.version>