diff --git a/buildSrc/src/main/kotlin/intellijUtils.kt b/buildSrc/src/main/kotlin/intellijUtils.kt
index 13fd77402..ba9b37640 100644
--- a/buildSrc/src/main/kotlin/intellijUtils.kt
+++ b/buildSrc/src/main/kotlin/intellijUtils.kt
@@ -3,6 +3,7 @@ import org.gradle.process.JavaForkOptions
 import org.jetbrains.intellij.platform.gradle.IntelliJPlatformType
 import org.jetbrains.intellij.platform.gradle.TestFrameworkType
 import org.jetbrains.intellij.platform.gradle.extensions.IntelliJPlatformDependenciesExtension
+import org.jetbrains.intellij.platform.gradle.extensions.IntelliJPlatformExtension
 import kotlin.reflect.KProperty
 
 const val VERIFY_CLASSES_TASK_NAME = "verifyClasses"
@@ -157,6 +158,14 @@ fun IntelliJPlatformDependenciesExtension.intellijIde(versionWithCode: String) {
   jetbrainsRuntime()
 }
 
+fun IntelliJPlatformExtension.PluginVerification.Ides.intellijIde(versionWithCode: String) {
+  val (type, version) = versionWithCode.toTypeWithVersion()
+  create(type, version) {
+    useInstaller.set(false)
+    useCache.set(true)
+  }
+}
+
 fun IntelliJPlatformDependenciesExtension.intellijPlugins(vararg notations: String) {
   for (notation in notations) {
     when {
diff --git a/gradle-261.properties b/gradle-261.properties
index 9e9b685fe..3074b83cb 100644
--- a/gradle-261.properties
+++ b/gradle-261.properties
@@ -4,8 +4,7 @@ customUntilBuild=261.*
 # Existent IDE versions can be found in the following repos:
 # https://www.jetbrains.com/intellij-repository/releases/
 # https://www.jetbrains.com/intellij-repository/snapshots/
-#261.22158.234
-ideaVersion=IU-261.23567.71-EAP-CANDIDATE
-clionVersion=CL-261.23567-EAP-CANDIDATE-SNAPSHOT
-pycharmVersion=PC-261.23567.80-EAP-SNAPSHOT
-riderVersion=RD-2026.1-RC1-SNAPSHOT
+ideaVersion=IU-2026.1.1
+clionVersion=CL-2026.1.1
+pycharmVersion=PC-2026.1
+riderVersion=RD-2026.1.0.1
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index c46a1627f..d2b39c48f 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,9 +1,9 @@
 [versions]
 educational-ml-library = "1.0.65"
-jackson = "2.17.2"
-kotlin = "2.3.0"
-okhttp = "4.12.0"
-retrofit = "2.9.0"
+jackson = "2.21.2"
+kotlin = "2.3.21"
+okhttp = "5.3.2"
+retrofit = "3.0.0"
 
 [libraries]
 annotations = { group = "org.jetbrains", name = "annotations", version = "23.0.0" }
@@ -15,7 +15,7 @@ jackson-dataformat-yaml = { group = "com.fasterxml.jackson.dataformat", name = "
 jackson-datatype-jsr310 = { group = "com.fasterxml.jackson.datatype", name = "jackson-datatype-jsr310", version.ref = "jackson" }
 jackson-module-kotlin = { group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin", version.ref = "jackson" }
 jsoup = { group = "org.jsoup", name = "jsoup", version = "1.17.2" }
-kotlin-css-jvm = { group = "org.jetbrains.kotlin-wrappers", name = "kotlin-css-jvm", version = "2025.5.11" }
+kotlin-css-jvm = { group = "org.jetbrains.kotlin-wrappers", name = "kotlin-css-jvm", version = "2026.4.12" }
 kotlin-stdlib = { group = "org.jetbrains.kotlin", name = "kotlin-stdlib", version.ref = "kotlin" }
 kotlinx-serialization = { group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-json", version = "1.8.0" }
 logging-interceptor = { group = "com.squareup.okhttp3", name = "logging-interceptor", version.ref = "okhttp" }
@@ -32,8 +32,8 @@ openTest4J = { group = "org.opentest4j", name = "opentest4j", version = "1.3.0"
 hamcrest = { group = "org.hamcrest", name = "hamcrest", version="2.2" }
 
 [plugins]
-intelliJPlatformPlugin = { id = "org.jetbrains.intellij.platform", version = "2.10.5" }
+intelliJPlatformPlugin = { id = "org.jetbrains.intellij.platform", version = "2.15.0" }
 kotlinPlugin = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlinSerializationPlugin = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
-propertiesPlugin = { id = "net.saliman.properties", version = "1.5.2" }
-testRetryPlugin = { id = "org.gradle.test-retry", version = "1.6.2" }
+propertiesPlugin = { id = "net.saliman.properties", version = "1.6.0" }
+testRetryPlugin = { id = "org.gradle.test-retry", version = "1.6.4" }
diff --git a/intellij-plugin/build.gradle.kts b/intellij-plugin/build.gradle.kts
index 0d196f161..21200b939 100644
--- a/intellij-plugin/build.gradle.kts
+++ b/intellij-plugin/build.gradle.kts
@@ -43,7 +43,7 @@ intellijPlatform {
 
   pluginVerification {
     ides {
-      ide(IntellijIdeaUltimate, ideaVersion.toTypeWithVersion().version)
+      intellijIde(ideaVersion)
     }
   }
 
diff --git a/intellij-plugin/hs-core/branches/261/src/org/hyperskill/academy/platform/OpenProjectTaskCompat.kt b/intellij-plugin/hs-core/branches/261/src/org/hyperskill/academy/platform/OpenProjectTaskCompat.kt
index cd432b7c4..28cc744d0 100644
--- a/intellij-plugin/hs-core/branches/261/src/org/hyperskill/academy/platform/OpenProjectTaskCompat.kt
+++ b/intellij-plugin/hs-core/branches/261/src/org/hyperskill/academy/platform/OpenProjectTaskCompat.kt
@@ -3,7 +3,6 @@ package org.hyperskill.academy.platform
 import com.intellij.ide.impl.OpenProjectTask
 import com.intellij.openapi.module.Module
 import com.intellij.openapi.project.Project
-import java.nio.file.Path
 
 /**
  * Compatibility helper to construct OpenProjectTask for 253+.