diff --git a/samples/server/others/kotlin-server/jaxrs-spec/build.gradle b/samples/server/others/kotlin-server/jaxrs-spec/build.gradle
index 08b7d334129..0200843b4be 100644
--- a/samples/server/others/kotlin-server/jaxrs-spec/build.gradle
+++ b/samples/server/others/kotlin-server/jaxrs-spec/build.gradle
@@ -2,7 +2,7 @@ group "org.openapitools"
 version "1.0.0"
 
 wrapper {
-    gradleVersion = "6.9"
+    gradleVersion = '6.9'
     distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
 }
 
@@ -48,4 +48,4 @@ dependencies {
     implementation("com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:$jackson_version")
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:$jackson_version")
     testImplementation("junit:junit:4.13.2")
-}
\ No newline at end of file
+}
diff --git a/samples/server/petstore/kotlin-server/jaxrs-spec-mutiny/build.gradle b/samples/server/petstore/kotlin-server/jaxrs-spec-mutiny/build.gradle
index 8ce9368aac9..d6fac3df1d3 100644
--- a/samples/server/petstore/kotlin-server/jaxrs-spec-mutiny/build.gradle
+++ b/samples/server/petstore/kotlin-server/jaxrs-spec-mutiny/build.gradle
@@ -2,7 +2,7 @@ group "org.openapitools"
 version "1.0.0"
 
 wrapper {
-    gradleVersion = "6.9"
+    gradleVersion = '6.9'
     distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
 }
 
@@ -51,4 +51,4 @@ dependencies {
     implementation("io.smallrye.reactive:mutiny:$mutiny_version")
     implementation("io.smallrye.reactive:mutiny-kotlin:$mutiny_version")
     testImplementation("junit:junit:4.13.2")
-}
\ No newline at end of file
+}
diff --git a/samples/server/petstore/kotlin-server/jaxrs-spec/build.gradle b/samples/server/petstore/kotlin-server/jaxrs-spec/build.gradle
index 08b7d334129..0200843b4be 100644
--- a/samples/server/petstore/kotlin-server/jaxrs-spec/build.gradle
+++ b/samples/server/petstore/kotlin-server/jaxrs-spec/build.gradle
@@ -2,7 +2,7 @@ group "org.openapitools"
 version "1.0.0"
 
 wrapper {
-    gradleVersion = "6.9"
+    gradleVersion = '6.9'
     distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
 }
 
@@ -48,4 +48,4 @@ dependencies {
     implementation("com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:$jackson_version")
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:$jackson_version")
     testImplementation("junit:junit:4.13.2")
-}
\ No newline at end of file
+}
diff --git a/samples/server/petstore/kotlin-server/ktor/build.gradle b/samples/server/petstore/kotlin-server/ktor/build.gradle
index 2edfc7bdbc1..bd883dc2291 100644
--- a/samples/server/petstore/kotlin-server/ktor/build.gradle
+++ b/samples/server/petstore/kotlin-server/ktor/build.gradle
@@ -2,7 +2,7 @@ group "org.openapitools"
 version "1.0.0"
 
 wrapper {
-    gradleVersion = '7.5'
+    gradleVersion = "7.4.2"
     distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
 }