diff --git a/modules/openapi-generator-core/pom.xml b/modules/openapi-generator-core/pom.xml
index 911c03c8573..bfd0c590831 100644
--- a/modules/openapi-generator-core/pom.xml
+++ b/modules/openapi-generator-core/pom.xml
@@ -6,7 +6,7 @@
     <artifactId>openapi-generator-project</artifactId>
     <groupId>org.openapitools</groupId>
     <!-- RELEASE_VERSION -->
-    <version>5.3.1</version>
+    <version>5.4.0-SNAPSHOT</version>
     <!-- /RELEASE_VERSION -->
     <relativePath>../..</relativePath>
   </parent>
diff --git a/modules/openapi-generator-gradle-plugin/gradle.properties b/modules/openapi-generator-gradle-plugin/gradle.properties
index c8fbf0f82a9..73b87d76810 100644
--- a/modules/openapi-generator-gradle-plugin/gradle.properties
+++ b/modules/openapi-generator-gradle-plugin/gradle.properties
@@ -1,5 +1,5 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=5.3.1
+openApiGeneratorVersion=5.4.0-SNAPSHOT
 # /RELEASE_VERSION
 
 # BEGIN placeholders
diff --git a/modules/openapi-generator-gradle-plugin/pom.xml b/modules/openapi-generator-gradle-plugin/pom.xml
index 6c6b9696d24..fdc1d34c6c2 100644
--- a/modules/openapi-generator-gradle-plugin/pom.xml
+++ b/modules/openapi-generator-gradle-plugin/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>5.3.1</version>
+        <version>5.4.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>
diff --git a/modules/openapi-generator-maven-plugin/examples/java-client.xml b/modules/openapi-generator-maven-plugin/examples/java-client.xml
index b82befe8268..aceecdeaecb 100644
--- a/modules/openapi-generator-maven-plugin/examples/java-client.xml
+++ b/modules/openapi-generator-maven-plugin/examples/java-client.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>5.3.1</version>
+                <version>5.4.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/kotlin.xml b/modules/openapi-generator-maven-plugin/examples/kotlin.xml
index 4960964cef4..c7681971d90 100644
--- a/modules/openapi-generator-maven-plugin/examples/kotlin.xml
+++ b/modules/openapi-generator-maven-plugin/examples/kotlin.xml
@@ -15,7 +15,7 @@
 				<groupId>org.openapitools</groupId>
 				<artifactId>openapi-generator-maven-plugin</artifactId>
 				<!-- RELEASE_VERSION -->
-				<version>5.3.1</version>
+				<version>5.4.0-SNAPSHOT</version>
 				<!-- /RELEASE_VERSION -->
 				<executions>
 					<execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml b/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
index f632bfc8826..d0edba77ea5 100644
--- a/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
+++ b/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
@@ -19,7 +19,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>5.3.1</version>
+                <version>5.4.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <dependencies>
                     <dependency>
diff --git a/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml b/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
index 4fc8acf7286..72559b55c7a 100644
--- a/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
+++ b/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>5.3.1</version>
+                <version>5.4.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/non-java.xml b/modules/openapi-generator-maven-plugin/examples/non-java.xml
index 1ccbb790eae..842e549e797 100644
--- a/modules/openapi-generator-maven-plugin/examples/non-java.xml
+++ b/modules/openapi-generator-maven-plugin/examples/non-java.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>5.3.1</version>
+                <version>5.4.0-SNAPSHOT</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/spring.xml b/modules/openapi-generator-maven-plugin/examples/spring.xml
index 3bb8d3a51ba..e1802203383 100644
--- a/modules/openapi-generator-maven-plugin/examples/spring.xml
+++ b/modules/openapi-generator-maven-plugin/examples/spring.xml
@@ -20,7 +20,7 @@
 				<groupId>org.openapitools</groupId>
 				<artifactId>openapi-generator-maven-plugin</artifactId>
 				<!-- RELEASE_VERSION -->
-				<version>5.3.1</version>
+				<version>5.4.0-SNAPSHOT</version>
 				<!-- /RELEASE_VERSION -->
 				<executions>
 					<execution>
diff --git a/modules/openapi-generator-maven-plugin/pom.xml b/modules/openapi-generator-maven-plugin/pom.xml
index 908c44da292..2589de28155 100644
--- a/modules/openapi-generator-maven-plugin/pom.xml
+++ b/modules/openapi-generator-maven-plugin/pom.xml
@@ -5,7 +5,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>5.3.1</version>
+        <version>5.4.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>
diff --git a/modules/openapi-generator-online/pom.xml b/modules/openapi-generator-online/pom.xml
index c8e77f5df36..be81d01ee26 100644
--- a/modules/openapi-generator-online/pom.xml
+++ b/modules/openapi-generator-online/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>5.3.1</version>
+        <version>5.4.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>
diff --git a/modules/openapi-generator/pom.xml b/modules/openapi-generator/pom.xml
index 15e0de2c602..2efa246d044 100644
--- a/modules/openapi-generator/pom.xml
+++ b/modules/openapi-generator/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>5.3.1</version>
+        <version>5.4.0-SNAPSHOT</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>
diff --git a/pom.xml b/pom.xml
index 3b27eb856d1..c77ae7240b4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
     <packaging>pom</packaging>
     <name>openapi-generator-project</name>
     <!-- RELEASE_VERSION -->
-    <version>5.3.1</version>
+    <version>5.4.0-SNAPSHOT</version>
     <!-- /RELEASE_VERSION -->
     <url>https://github.com/openapitools/openapi-generator</url>
     <scm>
diff --git a/samples/openapi3/client/petstore/dart-dio-next/dio_http_petstore_client_lib_fake/.openapi-generator/VERSION b/samples/openapi3/client/petstore/dart-dio-next/dio_http_petstore_client_lib_fake/.openapi-generator/VERSION
new file mode 100644
index 00000000000..0984c4c1ad2
--- /dev/null
+++ b/samples/openapi3/client/petstore/dart-dio-next/dio_http_petstore_client_lib_fake/.openapi-generator/VERSION
@@ -0,0 +1 @@
+5.4.0-SNAPSHOT
\ No newline at end of file