diff --git a/.github/workflows/samples-kotlin-server-jdk17.yaml b/.github/workflows/samples-kotlin-server-jdk17.yaml
index 065f05f5818..32f1856207a 100644
--- a/.github/workflows/samples-kotlin-server-jdk17.yaml
+++ b/.github/workflows/samples-kotlin-server-jdk17.yaml
@@ -2,26 +2,28 @@ name: Samples Kotlin server (jdk17)
 
 on:
   push:
-    branches:
+    paths:
       - 'samples/server/petstore/kotlin-springboot-3*/**'
-      - 'samples/server/petstore/kotlin-server/javalin/**'
-      - 'samples/server/petstore/kotlin-server/javalin-6/**'
+      - 'samples/server/petstore/kotlin-server/**'
+      - 'samples/server/petstore/kotlin-server-modelMutable/**'
+      - 'samples/server/petstore/kotlin-springboot-*/**'
       # comment out due to gradle build failure
       # - samples/server/petstore/kotlin-spring-default/**
   pull_request:
     paths:
       - 'samples/server/petstore/kotlin-springboot-3*/**'
-      - 'samples/server/petstore/kotlin-server/javalin/**'
-      - 'samples/server/petstore/kotlin-server/javalin-6/**'
+      - 'samples/server/petstore/kotlin-server/**'
+      - 'samples/server/petstore/kotlin-server-modelMutable/**'
+      - 'samples/server/petstore/kotlin-springboot-*/**'
       # comment out due to gradle build failure
       # - samples/server/petstore/kotlin-spring-default/**
 
 env:
-  GRADLE_VERSION: 7.4
+  GRADLE_VERSION: '8.10'
 
 jobs:
   build:
-    name: Build Kotlin server
+    name: Build Kotlin server (jdk17)
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -31,8 +33,11 @@ jobs:
           - samples/server/petstore/kotlin-springboot-3
           - samples/server/petstore/kotlin-springboot-delegate-nodefaults
           - samples/server/petstore/kotlin-springboot-request-cookie
+          - samples/server/petstore/kotlin-server/jaxrs-spec
+          - samples/server/petstore/kotlin-server/jaxrs-spec-mutiny
           - samples/server/petstore/kotlin-server/javalin
           - samples/server/petstore/kotlin-server/javalin-6
+          - samples/server/petstore/kotlin-server/ktor
           # comment out due to gradle build failure
           # - samples/server/petstore/kotlin-spring-default/
     steps:
diff --git a/.github/workflows/samples-kotlin-server-jdk21.yaml b/.github/workflows/samples-kotlin-server-jdk21.yaml
index 98656961d16..18a2b82eeb9 100644
--- a/.github/workflows/samples-kotlin-server-jdk21.yaml
+++ b/.github/workflows/samples-kotlin-server-jdk21.yaml
@@ -2,24 +2,25 @@ name: Samples Kotlin server (jdk21)
 
 on:
   push:
-    branches:
-      - 'samples/server/petstore/kotlin-server/javalin-6/**'
+    paths:
+      - 'samples/server/petstore/kotlin-server/**'
   pull_request:
     paths:
-      - 'samples/server/petstore/kotlin-server/javalin-6/**'
+      - 'samples/server/petstore/kotlin-server/**'
 
 env:
-  GRADLE_VERSION: 8.8
+  GRADLE_VERSION: '8.10'
 
 jobs:
   build:
-    name: Build Kotlin server
+    name: Build Kotlin server (jdk21)
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         sample:
           - samples/server/petstore/kotlin-server/javalin-6
+          - samples/server/petstore/kotlin-server/ktor
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4
diff --git a/.github/workflows/samples-kotlin-server.yaml b/.github/workflows/samples-kotlin-server.yaml
index c22ea48860b..f46719f46b4 100644
--- a/.github/workflows/samples-kotlin-server.yaml
+++ b/.github/workflows/samples-kotlin-server.yaml
@@ -1,8 +1,8 @@
-name: Samples Kotlin server
+name: Samples Kotlin server (jdk8)
 
 on:
   push:
-    branches:
+    paths:
       - samples/server/others/kotlin-server/jaxrs-spec/**
       - 'samples/server/petstore/kotlin*/**'
       - 'samples/server/others/kotlin-server/jaxrs-spec-array-response/**'
@@ -21,7 +21,7 @@ env:
 
 jobs:
   build:
-    name: Build Kotlin server
+    name: Build Kotlin server (jdk8)
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
diff --git a/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin5/build.gradle.kts.mustache b/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin5/build.gradle.kts.mustache
index b3ca461c6b0..f3f984587b0 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin5/build.gradle.kts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin5/build.gradle.kts.mustache
@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.9.21"
+    kotlin("jvm") version "1.9.25"
 }
 
 group = "{{groupId}}"
diff --git a/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin6/build.gradle.kts.mustache b/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin6/build.gradle.kts.mustache
index e7ca78dba68..215e6537e6e 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin6/build.gradle.kts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-server/libraries/javalin6/build.gradle.kts.mustache
@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm") version "2.0.0"
+    kotlin("jvm") version "2.0.21"
 }
 
 group = "{{groupId}}"
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradle-sb3-Kts.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradle-sb3-Kts.mustache
index ba86597af34..1cca74ad1ed 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradle-sb3-Kts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradle-sb3-Kts.mustache
@@ -20,7 +20,7 @@ tasks.bootJar {
 
 {{/interfaceOnly}}
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradleKts.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradleKts.mustache
index fd53cebadea..e7059406f3d 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradleKts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-boot/buildGradleKts.mustache
@@ -27,7 +27,7 @@ tasks.bootJar {
 
 {{/interfaceOnly}}
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradle-sb3-Kts.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradle-sb3-Kts.mustache
index 3c1fb53f506..1217abd6690 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradle-sb3-Kts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradle-sb3-Kts.mustache
@@ -14,7 +14,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradleKts.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradleKts.mustache
index c362c3ac6cb..19beb047167 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradleKts.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradleKts.mustache
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-server/javalin-6/build.gradle.kts b/samples/server/petstore/kotlin-server/javalin-6/build.gradle.kts
index e2d7db33382..220ec0c53ac 100644
--- a/samples/server/petstore/kotlin-server/javalin-6/build.gradle.kts
+++ b/samples/server/petstore/kotlin-server/javalin-6/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm") version "2.0.0"
+    kotlin("jvm") version "2.0.21"
 }
 
 group = "org.openapitools"
diff --git a/samples/server/petstore/kotlin-server/javalin/build.gradle.kts b/samples/server/petstore/kotlin-server/javalin/build.gradle.kts
index fcee6e70403..ff8243e3002 100644
--- a/samples/server/petstore/kotlin-server/javalin/build.gradle.kts
+++ b/samples/server/petstore/kotlin-server/javalin/build.gradle.kts
@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.9.21"
+    kotlin("jvm") version "1.9.25"
 }
 
 group = "org.openapitools"
diff --git a/samples/server/petstore/kotlin-spring-cloud/build.gradle.kts b/samples/server/petstore/kotlin-spring-cloud/build.gradle.kts
index fd3524ba760..ac2381f20ab 100644
--- a/samples/server/petstore/kotlin-spring-cloud/build.gradle.kts
+++ b/samples/server/petstore/kotlin-spring-cloud/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-spring-default/build.gradle.kts b/samples/server/petstore/kotlin-spring-default/build.gradle.kts
index a1401036300..87318fc5e13 100644
--- a/samples/server/petstore/kotlin-spring-default/build.gradle.kts
+++ b/samples/server/petstore/kotlin-spring-default/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-3/build.gradle.kts b/samples/server/petstore/kotlin-springboot-3/build.gradle.kts
index 845c13cc4e7..473c0162e0f 100644
--- a/samples/server/petstore/kotlin-springboot-3/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-3/build.gradle.kts
@@ -14,7 +14,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-bigdecimal-default/build.gradle.kts b/samples/server/petstore/kotlin-springboot-bigdecimal-default/build.gradle.kts
index a1401036300..87318fc5e13 100644
--- a/samples/server/petstore/kotlin-springboot-bigdecimal-default/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-bigdecimal-default/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-delegate-nodefaults/build.gradle.kts b/samples/server/petstore/kotlin-springboot-delegate-nodefaults/build.gradle.kts
index aed068708de..8a3d16c5fad 100644
--- a/samples/server/petstore/kotlin-springboot-delegate-nodefaults/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-delegate-nodefaults/build.gradle.kts
@@ -14,7 +14,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-delegate/build.gradle.kts b/samples/server/petstore/kotlin-springboot-delegate/build.gradle.kts
index a1401036300..87318fc5e13 100644
--- a/samples/server/petstore/kotlin-springboot-delegate/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-delegate/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-integer-enum/build.gradle.kts b/samples/server/petstore/kotlin-springboot-integer-enum/build.gradle.kts
index 02857aa8582..0caea597c84 100644
--- a/samples/server/petstore/kotlin-springboot-integer-enum/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-integer-enum/build.gradle.kts
@@ -18,7 +18,7 @@ tasks.bootJar {
 }
 
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-modelMutable/build.gradle.kts b/samples/server/petstore/kotlin-springboot-modelMutable/build.gradle.kts
index a1401036300..87318fc5e13 100644
--- a/samples/server/petstore/kotlin-springboot-modelMutable/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-modelMutable/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts b/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts
index a1401036300..87318fc5e13 100644
--- a/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-reactive/build.gradle.kts b/samples/server/petstore/kotlin-springboot-reactive/build.gradle.kts
index 1dfacb1d8cd..568be3488b1 100644
--- a/samples/server/petstore/kotlin-springboot-reactive/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-reactive/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-request-cookie/build.gradle.kts b/samples/server/petstore/kotlin-springboot-request-cookie/build.gradle.kts
index 1b194e84db1..ebeee8407bc 100644
--- a/samples/server/petstore/kotlin-springboot-request-cookie/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-request-cookie/build.gradle.kts
@@ -18,7 +18,7 @@ tasks.bootJar {
 }
 
 plugins {
-    val kotlinVersion = "1.7.10"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-source-swagger1/build.gradle.kts b/samples/server/petstore/kotlin-springboot-source-swagger1/build.gradle.kts
index ff68504160e..6a425af8a35 100644
--- a/samples/server/petstore/kotlin-springboot-source-swagger1/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-source-swagger1/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-source-swagger2/build.gradle.kts b/samples/server/petstore/kotlin-springboot-source-swagger2/build.gradle.kts
index 06603d0c674..02dda8ee6d2 100644
--- a/samples/server/petstore/kotlin-springboot-source-swagger2/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-source-swagger2/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot-springfox/build.gradle.kts b/samples/server/petstore/kotlin-springboot-springfox/build.gradle.kts
index b2e2e533e29..4a927dcde67 100644
--- a/samples/server/petstore/kotlin-springboot-springfox/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot-springfox/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
diff --git a/samples/server/petstore/kotlin-springboot/build.gradle.kts b/samples/server/petstore/kotlin-springboot/build.gradle.kts
index 0708b52b6d4..2af5e54061e 100644
--- a/samples/server/petstore/kotlin-springboot/build.gradle.kts
+++ b/samples/server/petstore/kotlin-springboot/build.gradle.kts
@@ -21,7 +21,7 @@ tasks.withType<KotlinCompile> {
 }
 
 plugins {
-    val kotlinVersion = "1.6.21"
+    val kotlinVersion = "1.9.25"
     id("org.jetbrains.kotlin.jvm") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion