diff --git a/build.gradle.kts b/build.gradle.kts
index b5fb094fc..177eab417 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -14,7 +14,7 @@ allprojects {
 		plugin("io.spring.dependency-management")
 	}
 
-	version = "0.4.0-SNAPSHOT"
+	version = "0.4.0"
 	group = "org.springframework.fu"
 
 	dependencyManagement {
diff --git a/jafu/README.adoc b/jafu/README.adoc
index 431b56477..3d4b9fdcb 100644
--- a/jafu/README.adoc
+++ b/jafu/README.adoc
@@ -1,4 +1,4 @@
-:spring-fu-version: 0.3.2
+:spring-fu-version: 0.4.0
 :jafu-javadoc-url: http://repo.spring.io/milestone/org/springframework/fu/spring-fu-jafu/{spring-fu-version}/spring-fu-jafu-{spring-fu-version}-javadoc.jar!
 :framework-javadoc-url: https://docs.spring.io/spring-framework/docs/5.3.x/javadoc-api
 
@@ -18,7 +18,7 @@ Be aware that a few static imports will be needed.
 
 === Getting started
 
- * Create a Spring `2.3.x.RELEASE` project on https://start.spring.io/[start.spring.io]
+ * Create a Spring `2.4.x.RELEASE` project on https://start.spring.io/[start.spring.io]
  * Add the Spring milestone repository `https://repo.spring.io/milestone`
  * Select the "Web" starter
  * Add the `org.springframework.fu:spring-fu-jafu:{spring-fu-version}` dependency
diff --git a/kofu/README.adoc b/kofu/README.adoc
index 1f71c3ed0..587bf8214 100644
--- a/kofu/README.adoc
+++ b/kofu/README.adoc
@@ -1,4 +1,4 @@
-:spring-fu-version: 0.3.2
+:spring-fu-version: 0.4.0
 :kofu-kdoc-url: http://repo.spring.io/milestone/org/springframework/fu/spring-fu-kofu/{spring-fu-version}/spring-fu-kofu-{spring-fu-version}-javadoc.jar!
 :framework-kdoc-url: https://docs.spring.io/spring-framework/docs/5.2.x/kdoc-api
 
@@ -70,7 +70,7 @@ To use WebFlux.fn instead
 === Getting started
 
 * Go to https://start.spring.io/#!type=gradle-project&language=kotlin[start.spring.io]
-* Select the latest Spring Boot `2.3.x.RELEASE` release
+* Select the latest Spring Boot `2.4.x.RELEASE` release
 * Add the Spring milestone repository `https://repo.spring.io/milestone`
 * Select the "Web" starter
 * Add the `org.springframework.fu:spring-fu-kofu:{spring-fu-version}` dependency
diff --git a/samples/jafu-reactive-minimal/build.gradle.kts b/samples/jafu-reactive-minimal/build.gradle.kts
index 8d3ae1396..18bf9b6ba 100644
--- a/samples/jafu-reactive-minimal/build.gradle.kts
+++ b/samples/jafu-reactive-minimal/build.gradle.kts
@@ -10,7 +10,7 @@ java {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-jafu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-jafu:0.4.0")
 
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 
diff --git a/samples/jafu-reactive-mongodb/build.gradle.kts b/samples/jafu-reactive-mongodb/build.gradle.kts
index 893b8d7b9..b3cf5ea14 100644
--- a/samples/jafu-reactive-mongodb/build.gradle.kts
+++ b/samples/jafu-reactive-mongodb/build.gradle.kts
@@ -10,7 +10,7 @@ java {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-jafu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-jafu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
diff --git a/samples/jafu-reactive-r2dbc/build.gradle.kts b/samples/jafu-reactive-r2dbc/build.gradle.kts
index a75f7a984..65bf8e60a 100644
--- a/samples/jafu-reactive-r2dbc/build.gradle.kts
+++ b/samples/jafu-reactive-r2dbc/build.gradle.kts
@@ -10,7 +10,7 @@ java {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-jafu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-jafu:0.4.0")
 
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
diff --git a/samples/jafu-servlet-minimal/build.gradle.kts b/samples/jafu-servlet-minimal/build.gradle.kts
index da80909ee..19d480ea2 100644
--- a/samples/jafu-servlet-minimal/build.gradle.kts
+++ b/samples/jafu-servlet-minimal/build.gradle.kts
@@ -10,7 +10,7 @@ java {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-jafu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-jafu:0.4.0")
 
 	implementation("org.springframework.boot:spring-boot-starter-web")
 
diff --git a/samples/kofu-coroutines-mongodb/build.gradle.kts b/samples/kofu-coroutines-mongodb/build.gradle.kts
index bd86ef15f..75be9f108 100644
--- a/samples/kofu-coroutines-mongodb/build.gradle.kts
+++ b/samples/kofu-coroutines-mongodb/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
diff --git a/samples/kofu-coroutines-r2dbc/build.gradle.kts b/samples/kofu-coroutines-r2dbc/build.gradle.kts
index 20d469f1c..8422ccfb9 100644
--- a/samples/kofu-coroutines-r2dbc/build.gradle.kts
+++ b/samples/kofu-coroutines-r2dbc/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-r2dbc")
diff --git a/samples/kofu-coroutines-validation/build.gradle.kts b/samples/kofu-coroutines-validation/build.gradle.kts
index 805a86bd9..356cfa42b 100644
--- a/samples/kofu-coroutines-validation/build.gradle.kts
+++ b/samples/kofu-coroutines-validation/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
 	implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core")
diff --git a/samples/kofu-petclinic-jdbc/pom.xml b/samples/kofu-petclinic-jdbc/pom.xml
index f739b08df..c46b931fe 100644
--- a/samples/kofu-petclinic-jdbc/pom.xml
+++ b/samples/kofu-petclinic-jdbc/pom.xml
@@ -34,7 +34,7 @@
         <dependency>
             <groupId>org.springframework.fu</groupId>
             <artifactId>spring-fu-kofu</artifactId>
-            <version>0.4.0-SNAPSHOT</version>
+            <version>0.4.0</version>
         </dependency>
 
         <!-- Spring and Spring Boot dependencies -->
diff --git a/samples/kofu-reactive-cassandra/build.gradle.kts b/samples/kofu-reactive-cassandra/build.gradle.kts
index 3eee28a03..48d16d35b 100644
--- a/samples/kofu-reactive-cassandra/build.gradle.kts
+++ b/samples/kofu-reactive-cassandra/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-cassandra-reactive")
diff --git a/samples/kofu-reactive-minimal/build.gradle.kts b/samples/kofu-reactive-minimal/build.gradle.kts
index f36c7fdd5..973b0eea5 100644
--- a/samples/kofu-reactive-minimal/build.gradle.kts
+++ b/samples/kofu-reactive-minimal/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 
 	testImplementation("org.springframework.boot:spring-boot-starter-test")
diff --git a/samples/kofu-reactive-mongodb/build.gradle.kts b/samples/kofu-reactive-mongodb/build.gradle.kts
index 2eae3a7e8..16b0477a3 100644
--- a/samples/kofu-reactive-mongodb/build.gradle.kts
+++ b/samples/kofu-reactive-mongodb/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
diff --git a/samples/kofu-reactive-r2dbc/build.gradle.kts b/samples/kofu-reactive-r2dbc/build.gradle.kts
index e584f52c7..cfb21c43a 100644
--- a/samples/kofu-reactive-r2dbc/build.gradle.kts
+++ b/samples/kofu-reactive-r2dbc/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
diff --git a/samples/kofu-reactive-redis/build.gradle.kts b/samples/kofu-reactive-redis/build.gradle.kts
index 1891c4b05..98cb92d16 100644
--- a/samples/kofu-reactive-redis/build.gradle.kts
+++ b/samples/kofu-reactive-redis/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("org.springframework.boot:spring-boot-starter-mustache")
 	implementation("org.springframework.boot:spring-boot-starter-data-redis")
diff --git a/samples/kofu-reactive-validation/build.gradle.kts b/samples/kofu-reactive-validation/build.gradle.kts
index 3cec8d294..176e6ac04 100644
--- a/samples/kofu-reactive-validation/build.gradle.kts
+++ b/samples/kofu-reactive-validation/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-webflux")
 	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
 	implementation("am.ik.yavi:yavi:0.4.0")
diff --git a/samples/kofu-servlet-minimal/build.gradle.kts b/samples/kofu-servlet-minimal/build.gradle.kts
index f45aba2da..f5888a9e1 100644
--- a/samples/kofu-servlet-minimal/build.gradle.kts
+++ b/samples/kofu-servlet-minimal/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-web")
 
 	testImplementation("org.springframework.boot:spring-boot-starter-test")
diff --git a/samples/kofu-servlet-validation/build.gradle.kts b/samples/kofu-servlet-validation/build.gradle.kts
index fcb4c84ac..c06b52348 100644
--- a/samples/kofu-servlet-validation/build.gradle.kts
+++ b/samples/kofu-servlet-validation/build.gradle.kts
@@ -7,7 +7,7 @@ plugins {
 }
 
 dependencies {
-	implementation("org.springframework.fu:spring-fu-kofu:0.4.0-SNAPSHOT")
+	implementation("org.springframework.fu:spring-fu-kofu:0.4.0")
 	implementation("org.springframework.boot:spring-boot-starter-web")
 	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
 	implementation("am.ik.yavi:yavi:0.4.0")