diff --git a/.runConfigurations/Run refreshVersions.run.xml b/.runConfigurations/Run refreshVersions.run.xml
new file mode 100644
index 0000000..b1f7d9a
--- /dev/null
+++ b/.runConfigurations/Run refreshVersions.run.xml	
@@ -0,0 +1,23 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run refreshVersions" type="GradleRunConfiguration" factoryName="Gradle">
+    <ExternalSystemSettings>
+      <option name="executionName" />
+      <option name="externalProjectPath" value="$PROJECT_DIR$" />
+      <option name="externalSystemIdString" value="GRADLE" />
+      <option name="scriptParameters" value="--console=plain" />
+      <option name="taskDescriptions">
+        <list />
+      </option>
+      <option name="taskNames">
+        <list>
+          <option value="refreshVersions" />
+        </list>
+      </option>
+      <option name="vmOptions" value="" />
+    </ExternalSystemSettings>
+    <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
+    <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+    <DebugAllEnabled>false</DebugAllEnabled>
+    <method v="2" />
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 159d35c..c31cd40 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,8 +1,8 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.4.20"
-    kotlin("kapt") version "1.4.20-RC"
+    kotlin("jvm")
+    kotlin("kapt")
     id("minecraft-data-sources")
 }
 
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 9fe154b..9fa160d 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     `java-gradle-plugin`
-    kotlin("jvm") version "1.4.20"
+    kotlin("jvm")
 }
 
 repositories {
@@ -8,12 +8,12 @@ repositories {
 }
 
 dependencies {
-    implementation("org.jetbrains.kotlin:kotlin-reflect:1.4.20")
+    implementation("org.jetbrains.kotlin:kotlin-reflect:_")
 
-    implementation("com.squareup.okhttp3:okhttp:4.9.0")
-    implementation("com.jsoniter:jsoniter:0.9.23")
-    implementation("com.squareup:kotlinpoet:1.7.2")
-    implementation("com.google.guava:guava:30.0-jre")
+    implementation(Square.okHttp3.okHttp)
+    implementation("com.jsoniter:jsoniter:_")
+    implementation(Square.kotlinPoet)
+    implementation("com.google.guava:guava:_")
 }
 
 tasks {
diff --git a/buildSrc/settings.gradle.kts b/buildSrc/settings.gradle.kts
new file mode 100644
index 0000000..3ff9aab
--- /dev/null
+++ b/buildSrc/settings.gradle.kts
@@ -0,0 +1,8 @@
+import de.fayard.refreshVersions.bootstrapRefreshVersionsForBuildSrc
+
+buildscript {
+    repositories { gradlePluginPortal() }
+    dependencies.classpath("de.fayard.refreshVersions:refreshVersions:0.9.7")
+}
+
+bootstrapRefreshVersionsForBuildSrc()
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 4ab8634..dfcaba3 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,3 +1,5 @@
+import de.fayard.refreshVersions.bootstrapRefreshVersions
+
 pluginManagement {
     repositories {
         mavenCentral()
@@ -5,8 +7,15 @@ pluginManagement {
     }
 }
 
+buildscript {
+    repositories { gradlePluginPortal() }
+    dependencies.classpath("de.fayard.refreshVersions:refreshVersions:0.9.7")
+}
+
 rootProject.name = "uranos"
 
+bootstrapRefreshVersions()
+
 include(":uranos-api")
 include(":uranos-nbt")
 include(":uranos-packet-codecs")
diff --git a/test-plugin/build.gradle.kts b/test-plugin/build.gradle.kts
index 3606cc5..1ebdc45 100644
--- a/test-plugin/build.gradle.kts
+++ b/test-plugin/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     kotlin("jvm")
-    id("com.github.johnrengelman.shadow") version "6.1.0"
+    id("com.github.johnrengelman.shadow")
 }
 
 group = "space.uranos.testplugin"
diff --git a/uranos-api/build.gradle.kts b/uranos-api/build.gradle.kts
index dc147c7..54eb710 100644
--- a/uranos-api/build.gradle.kts
+++ b/uranos-api/build.gradle.kts
@@ -11,34 +11,26 @@ repositories {
     jcenter()
 }
 
-val kotlinVersion = properties["version.kotlin"].toString()
-val spekVersion = properties["version.spek"].toString()
-val moshiVersion = properties["version.moshi"].toString()
-val coroutinesVersion = properties["version.kotlinx-coroutines"].toString()
-val nettyVersion = properties["version.netty"].toString()
-val junitVersion = properties["version.junit"].toString()
-val striktVersion = properties["version.strikt"].toString()
-val guavaVersion = properties["version.guava"].toString()
 
 dependencies {
     // Kotlin
-    api("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion")
-    api("org.jetbrains.kotlinx:kotlinx-coroutines-core:${coroutinesVersion}")
+    api("org.jetbrains.kotlin:kotlin-reflect:_")
+    api(KotlinX.coroutines.core)
 
     // JSON
-    kapt("com.squareup.moshi:moshi-kotlin-codegen:${moshiVersion}")
-    api("com.squareup.moshi:moshi:${moshiVersion}")
+    kapt(Square.moshi.kotlinCodegen)
+    api(Square.moshi)
 
     // Netty
-    api("io.netty:netty-buffer:${nettyVersion}")
+    api("io.netty:netty-buffer:_")
 
     // Other
-    api("com.google.guava:guava:$guavaVersion")
+    api("com.google.guava:guava:_")
 
     // Testing
-    testImplementation("io.strikt:strikt-core:${striktVersion}")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:${junitVersion}")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:${junitVersion}")
+    testImplementation(Testing.Strikt.core)
+    testImplementation(Testing.junit.api)
+    testRuntimeOnly(Testing.junit.engine)
 }
 
 kotlin {
diff --git a/uranos-nbt/build.gradle.kts b/uranos-nbt/build.gradle.kts
index 2c07e8b..a203a5d 100644
--- a/uranos-nbt/build.gradle.kts
+++ b/uranos-nbt/build.gradle.kts
@@ -10,18 +10,14 @@ repositories {
     jcenter()
 }
 
-val nettyVersion = properties["version.netty"].toString()
-val junitVersion = properties["version.junit"].toString()
-val striktVersion = properties["version.strikt"].toString()
-
 dependencies {
     // Netty
-    api("io.netty:netty-buffer:${nettyVersion}")
+    api("io.netty:netty-buffer:_")
 
     // Testing
-    testImplementation("io.strikt:strikt-core:${striktVersion}")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:${junitVersion}")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:${junitVersion}")
+    testImplementation(Testing.Strikt.core)
+    testImplementation(Testing.junit.api)
+    testRuntimeOnly(Testing.junit.engine)
 }
 
 tasks {
diff --git a/uranos-packet-codecs/build.gradle.kts b/uranos-packet-codecs/build.gradle.kts
index edc0ae6..8e7a9a3 100644
--- a/uranos-packet-codecs/build.gradle.kts
+++ b/uranos-packet-codecs/build.gradle.kts
@@ -10,25 +10,20 @@ repositories {
     jcenter()
 }
 
-val nettyVersion = properties["version.netty"].toString()
-val junitVersion = properties["version.junit"].toString()
-val striktVersion = properties["version.strikt"].toString()
-val guavaVersion = properties["version.guava"].toString()
-
 dependencies {
     api(project(":uranos-packets"))
     api(project(":uranos-nbt"))
 
     // Netty
-    api("io.netty:netty-buffer:${nettyVersion}")
+    api("io.netty:netty-buffer:_")
 
     // Other
-    api("com.google.guava:guava:$guavaVersion")
+    api("com.google.guava:guava:_")
 
     // Testing
-    testImplementation("io.strikt:strikt-core:${striktVersion}")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:${junitVersion}")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:${junitVersion}")
+    testImplementation(Testing.Strikt.core)
+    testImplementation(Testing.junit.api)
+    testRuntimeOnly(Testing.junit.engine)
 }
 
 tasks {
diff --git a/uranos-server/build.gradle.kts b/uranos-server/build.gradle.kts
index 7cdf849..3a59555 100644
--- a/uranos-server/build.gradle.kts
+++ b/uranos-server/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     kotlin("jvm")
     kotlin("kapt")
-    id("com.github.johnrengelman.shadow") version "6.1.0"
+    id("com.github.johnrengelman.shadow")
 }
 
 group = rootProject.group
@@ -13,17 +13,10 @@ repositories {
     maven("https://jitpack.io")
 }
 
-val coroutinesVersion = properties["version.kotlinx-coroutines"].toString()
-val slf4jVersion = properties["version.slf4j"].toString()
-val nettyVersion = properties["version.netty"].toString()
-val moshiVersion = properties["version.moshi"].toString()
-val junitVersion = properties["version.junit"].toString()
-val striktVersion = properties["version.strikt"].toString()
-
 dependencies {
     // Kotlin
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:${coroutinesVersion}")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:${coroutinesVersion}")
+    implementation(KotlinX.coroutines.core)
+    implementation(KotlinX.coroutines.jdk8) // TODO: What is jdk9?
 
     // Uranos
     implementation(project(":uranos-api"))
@@ -32,36 +25,33 @@ dependencies {
     implementation(project(":uranos-nbt"))
 
     // Logging
-    implementation("org.slf4j:slf4j-api:${slf4jVersion}")
-    implementation("ch.qos.logback:logback-classic:1.2.3")
-    implementation("de.moritzruth:khalk:1.0.0-fix")
+    implementation("org.slf4j:slf4j-api:_")
+    implementation("ch.qos.logback:logback-classic:_")
+    implementation("de.moritzruth:khalk:_")
 
     // Netty
-    implementation("io.netty:netty-handler:${nettyVersion}")
-    implementation("io.netty:netty-buffer:${nettyVersion}")
-    implementation("io.netty:netty-codec:${nettyVersion}")
-    implementation("io.netty:netty-transport:${nettyVersion}")
-    implementation("io.netty:netty-transport-native-epoll:${nettyVersion}")
-    implementation("io.netty:netty-transport-native-kqueue:${nettyVersion}")
+    implementation("io.netty:netty-handler:_")
+    implementation("io.netty:netty-buffer:_")
+    implementation("io.netty:netty-codec:_")
+    implementation("io.netty:netty-transport:_")
+    implementation("io.netty:netty-transport-native-epoll:_")
+    implementation("io.netty:netty-transport-native-kqueue:_")
 
     // Other
-    implementation("com.squareup.okhttp3:okhttp:4.9.0")
-    implementation("com.sksamuel.hoplite:hoplite-core:1.3.9")
-    implementation("com.sksamuel.hoplite:hoplite-yaml:1.3.9")
-    kapt("com.squareup.moshi:moshi-kotlin-codegen:${moshiVersion}")
+    implementation(Square.okHttp3.okHttp)
+    implementation("com.sksamuel.hoplite:hoplite-core:_")
+    implementation("com.sksamuel.hoplite:hoplite-yaml:_")
+    kapt(Square.moshi.kotlinCodegen)
 
     // Testing
-    testImplementation("io.strikt:strikt-core:${striktVersion}")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:${junitVersion}")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:${junitVersion}")
+    testImplementation(Testing.Strikt.core)
+    testImplementation(Testing.junit.api)
+    testRuntimeOnly(Testing.junit.engine)
 }
 
 tasks {
     compileKotlin {
-        kotlinOptions.freeCompilerArgs = listOf(
-            "-Xopt-in=kotlin.RequiresOptIn",
-            "-progressive"
-        )
+        kotlinOptions.freeCompilerArgs += "-Xopt-in=kotlin.RequiresOptIn"
     }
 
     test {
diff --git a/versions.properties b/versions.properties
new file mode 100644
index 0000000..5644df8
--- /dev/null
+++ b/versions.properties
@@ -0,0 +1,85 @@
+## suppress inspection "SpellCheckingInspection" for whole file
+## suppress inspection "UnusedProperty" for whole file
+##
+## Dependencies and Plugin versions with their available updates
+## Generated by $ ./gradlew refreshVersions
+## Please, don't put extra comments in that file yet, keeping them is not supported yet.
+
+plugin.com.github.johnrengelman.shadow=6.1.0
+plugin.org.jetbrains.kotlin.kapt.gradle.plugin=1.4.20-RC
+plugin.org.jetbrains.kotlin.jvm=1.4.20
+
+version.ch.qos.logback..logback-classic=1.2.3
+##                          # available=1.3.0-alpha0
+##                          # available=1.3.0-alpha1
+##                          # available=1.3.0-alpha2
+##                          # available=1.3.0-alpha3
+##                          # available=1.3.0-alpha4
+##                          # available=1.3.0-alpha5
+
+version.com.google.guava..guava=30.0-jre
+##                  # available=30.1-android
+##                  # available=30.1-jre
+
+version.com.jsoniter..jsoniter=0.9.23
+
+version.com.sksamuel.hoplite..hoplite-core=1.3.13
+
+version.com.sksamuel.hoplite..hoplite-yaml=1.3.13
+
+version.de.moritzruth..khalk=1.0.0-fix
+
+version.io.netty..netty-buffer=4.1.54.Final
+##                 # available=4.1.55.Final
+##                 # available=4.1.56.Final
+##                 # available=5.0.0.Alpha1
+##                 # available=5.0.0.Alpha2
+
+version.io.netty..netty-codec=4.1.56.Final
+##                # available=5.0.0.Alpha1
+##                # available=5.0.0.Alpha2
+
+version.io.netty..netty-handler=4.1.56.Final
+##                  # available=5.0.0.Alpha1
+##                  # available=5.0.0.Alpha2
+
+version.io.netty..netty-transport=4.1.56.Final
+##                    # available=5.0.0.Alpha1
+##                    # available=5.0.0.Alpha2
+
+version.io.netty..netty-transport-native-epoll=4.1.56.Final
+##                                 # available=5.0.0.Alpha2
+
+version.io.netty..netty-transport-native-kqueue=4.1.56.Final
+
+version.io.strikt..strikt-core=0.28.0
+##                 # available=0.28.1
+
+version.kotlin=1.4.20
+## # available=1.4.21
+## # available=1.4.21-2
+## # available=1.4.30-M1
+
+version.kotlinpoet=1.7.2
+
+version.kotlinx.coroutines=1.4.2
+
+version.moshi=1.11.0
+
+version.okhttp3=4.9.0
+##  # available=4.10.0-RC1
+
+version.org.junit.jupiter..junit-jupiter-api=5.7.0
+
+version.org.junit.jupiter..junit-jupiter-engine=5.7.0
+
+version.org.slf4j..slf4j-api=1.7.30
+##               # available=1.8.0-alpha0
+##               # available=1.8.0-alpha1
+##               # available=1.8.0-alpha2
+##               # available=1.8.0-beta0
+##               # available=1.8.0-beta1
+##               # available=1.8.0-beta2
+##               # available=1.8.0-beta4
+##               # available=2.0.0-alpha0
+##               # available=2.0.0-alpha1