diff --git a/chapter01/pom.xml b/chapter01/pom.xml
index 581d6c07..a7dd32c4 100644
--- a/chapter01/pom.xml
+++ b/chapter01/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>                    <!--2-->
+        <version>2.2.6.RELEASE</version>                    <!--2-->
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter02/pom.xml b/chapter02/pom.xml
index 52f92cce..a2d10368 100644
--- a/chapter02/pom.xml
+++ b/chapter02/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>                    <!--2-->
+        <version>2.2.6.RELEASE</version>                    <!--2-->
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter03-jdbc/pom.xml b/chapter03-jdbc/pom.xml
index fd11cf0e..b52f333e 100644
--- a/chapter03-jdbc/pom.xml
+++ b/chapter03-jdbc/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE
+        <version>2.2.6.RELEASE
         </version> <!-- Sticking with 2.0.0.RELEASE for now. Problem with GeneratedKeyHolder in 2.0.1.RELEASE and higher. -->
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
diff --git a/chapter03-jpa/pom.xml b/chapter03-jpa/pom.xml
index 7765784b..e4f42dc5 100644
--- a/chapter03-jpa/pom.xml
+++ b/chapter03-jpa/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter04/pom.xml b/chapter04/pom.xml
index 97321a6f..5faa972e 100644
--- a/chapter04/pom.xml
+++ b/chapter04/pom.xml
@@ -11,7 +11,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter05/pom.xml b/chapter05/pom.xml
index e514ee4e..2d639735 100644
--- a/chapter05/pom.xml
+++ b/chapter05/pom.xml
@@ -11,7 +11,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter06/pom.xml b/chapter06/pom.xml
index 21c9abf3..95f971d8 100644
--- a/chapter06/pom.xml
+++ b/chapter06/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter07/pom.xml b/chapter07/pom.xml
index dd51594d..805768af 100644
--- a/chapter07/pom.xml
+++ b/chapter07/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter08/pom.xml b/chapter08/pom.xml
index 6967b15b..f3a867ea 100644
--- a/chapter08/pom.xml
+++ b/chapter08/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter09-flow/pom.xml b/chapter09-flow/pom.xml
index 914a25e1..42de92bd 100644
--- a/chapter09-flow/pom.xml
+++ b/chapter09-flow/pom.xml
@@ -15,7 +15,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter09/pom.xml b/chapter09/pom.xml
index f0d83d75..6210b4b3 100644
--- a/chapter09/pom.xml
+++ b/chapter09/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter10/pom.xml b/chapter10/pom.xml
index d18cf1bc..9641c9cb 100644
--- a/chapter10/pom.xml
+++ b/chapter10/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter11-12-cassandra/pom.xml b/chapter11-12-cassandra/pom.xml
index 2f206438..65a2adae 100644
--- a/chapter11-12-cassandra/pom.xml
+++ b/chapter11-12-cassandra/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter11-12-mongodb/pom.xml b/chapter11-12-mongodb/pom.xml
index eb4ecab2..e51c9570 100644
--- a/chapter11-12-mongodb/pom.xml
+++ b/chapter11-12-mongodb/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/>
     </parent>
 
diff --git a/chapter13/pom.xml b/chapter13/pom.xml
index 7a863024..c8fb34cd 100644
--- a/chapter13/pom.xml
+++ b/chapter13/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter14-greettings/pom.xml b/chapter14-greettings/pom.xml
index 30464616..6d1c257e 100644
--- a/chapter14-greettings/pom.xml
+++ b/chapter14-greettings/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter14/pom.xml b/chapter14/pom.xml
index bfad66c2..1bd5414e 100644
--- a/chapter14/pom.xml
+++ b/chapter14/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter15/pom.xml b/chapter15/pom.xml
index 0972ec7f..88614ebc 100644
--- a/chapter15/pom.xml
+++ b/chapter15/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter16/pom.xml b/chapter16/pom.xml
index fd1eb60d..006a7f61 100644
--- a/chapter16/pom.xml
+++ b/chapter16/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter17/pom.xml b/chapter17/pom.xml
index aabf1898..f69f0f3d 100644
--- a/chapter17/pom.xml
+++ b/chapter17/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter18/pom.xml b/chapter18/pom.xml
index ed5db836..d51db6b9 100644
--- a/chapter18/pom.xml
+++ b/chapter18/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
diff --git a/chapter19/pom.xml b/chapter19/pom.xml
index c1f0fc8c..77c70fb3 100644
--- a/chapter19/pom.xml
+++ b/chapter19/pom.xml
@@ -12,7 +12,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.4.RELEASE</version>
+        <version>2.2.6.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>