diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ae52d9..860c47a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 ### Changed
+- Coroutines tests are applied only when explicit `useCoroutines` is used.
 
 ### Deprecated
 
@@ -29,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Atomicfu support inside the plugin
 
 ### Fixed
+- Rollback coroutines to 1.6.1
 
 ### Security
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 1566a36..690e4d3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     alias(libs.plugins.changelog)
     alias(libs.plugins.dokka)
-    //alias(libs.plugins.kotlin.jvm) apply false
+    alias(libs.plugins.kotlin.jvm)
     `java-gradle-plugin`
     `kotlin-dsl`
     `maven-publish`
@@ -32,7 +32,7 @@ dependencies {
     implementation(libs.changelog.gradle)
     implementation(libs.dokka.gradle)
     implementation(libs.kotlin.jupyter.gradle)
-    //implementation(libs.kotlin.serialization)
+    implementation(libs.kotlin.serialization)
     implementation(libs.kotlinx.html)
     implementation("org.tomlj:tomlj:1.0.0")
 //    // nexus publishing plugin
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 5da12c1..320fc4a 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -8,7 +8,7 @@ dokka = "1.6.21"
 kotlin-jupyter = "0.11.0-106"
 kotlinx-benchmark = "0.4.2"
 kotlinx-cli = "0.3.4"
-kotlinx-coroutines = "1.6.2"
+kotlinx-coroutines = "1.6.1"
 kotlinx-datetime = "0.3.3"
 kotlinx-html = "0.7.5"
 kotlinx-knit = "0.4.0"
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/KScienceExtension.kt b/src/main/kotlin/ru/mipt/npm/gradle/KScienceExtension.kt
index 4654e55..c255d4a 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/KScienceExtension.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/KScienceExtension.kt
@@ -50,11 +50,18 @@ public class KScienceExtension(public val project: Project) {
         version: String = KScienceVersions.coroutinesVersion,
         sourceSet: DependencySourceSet = DependencySourceSet.MAIN,
         configuration: DependencyConfiguration = DependencyConfiguration.API,
-    ): Unit = project.useCommonDependency(
-        "org.jetbrains.kotlinx:kotlinx-coroutines-core:$version",
-        dependencySourceSet = sourceSet,
-        dependencyConfiguration = configuration
-    )
+    ): Unit {
+        project.useCommonDependency(
+            "org.jetbrains.kotlinx:kotlinx-coroutines-core:$version",
+            dependencySourceSet = sourceSet,
+            dependencyConfiguration = configuration
+        )
+        project.useCommonDependency(
+            "org.jetbrains.kotlinx:kotlinx-coroutines-test:$version",
+            dependencySourceSet = DependencySourceSet.TEST,
+            dependencyConfiguration = DependencyConfiguration.IMPLEMENTATION
+        )
+    }
 
     /**
      * Use core serialization library and configure targets
diff --git a/src/main/kotlin/ru/mipt/npm/gradle/commonConfigurations.kt b/src/main/kotlin/ru/mipt/npm/gradle/commonConfigurations.kt
index b94d86d..e05df86 100644
--- a/src/main/kotlin/ru/mipt/npm/gradle/commonConfigurations.kt
+++ b/src/main/kotlin/ru/mipt/npm/gradle/commonConfigurations.kt
@@ -36,7 +36,6 @@ public fun Project.configureKScience(
                 dependencies {
                     implementation(kotlin("test-junit5"))
                     implementation("org.junit.jupiter:junit-jupiter:${KScienceVersions.junit}")
-                    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:${KScienceVersions.coroutinesVersion}")
                 }
             }
 
@@ -82,7 +81,6 @@ public fun Project.configureKScience(
             sourceSets["test"].apply {
                 dependencies {
                     implementation(kotlin("test-js"))
-                    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:${KScienceVersions.coroutinesVersion}")
                 }
             }
 
@@ -124,7 +122,6 @@ public fun Project.configureKScience(
                     dependencies {
                         implementation(kotlin("test-common"))
                         implementation(kotlin("test-annotations-common"))
-                        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:${KScienceVersions.coroutinesVersion}")
                     }
                 }
                 val jvmMain by getting