diff --git a/build.gradle b/build.gradle
index 50fdc92..1c08a8a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,12 +1,27 @@
+ext {
+    versions = [
+            json: '20230227', // org.json:json
+            snakeyaml: '1.20', // org.yaml:snakeyaml
+            okhttp: '3.8.1', // com.squareup.okhttp3:okhttp
+            socket: '1.0.2', // io.socket:socket.io-client
+            jline: '2.14.5', // jline:jline
+
+            junit: '5.9.2', // org.junit:junit-bom
+            jmh: '1.37' // org.openjdk.jmh:jmh-core
+    ]
+}
+
 allprojects {
     repositories {
         mavenCentral()
     }
 
     gradle.projectsEvaluated {
-        tasks.withType(JavaCompile) {
-            [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
-            options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
+        tasks.withType(JavaCompile).tap {
+            configureEach {
+                [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
+                options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
+            }
         }
     }
 }
diff --git a/modules/main/build.gradle b/modules/main/build.gradle
index f4e3e04..ac3fdd0 100644
--- a/modules/main/build.gradle
+++ b/modules/main/build.gradle
@@ -9,14 +9,14 @@ version = '2.0-SNAPSHOT'
 dependencies {
     api project(":ownlang-core")
 
-    implementation 'com.squareup.okhttp3:okhttp:3.8.1'
-    implementation ('io.socket:socket.io-client:1.0.2') {
+    implementation "com.squareup.okhttp3:okhttp:${versions.okhttp}"
+    implementation ("io.socket:socket.io-client:${versions.socket}") {
         exclude group: 'org.json', module: 'json'
     }
-    implementation 'org.json:json:20230227'
-    implementation 'org.yaml:snakeyaml:1.20'
+    implementation "org.json:json:${versions.json}"
+    implementation "org.yaml:snakeyaml:${versions.snakeyaml}"
 
-    testImplementation platform('org.junit:junit-bom:5.9.2')
+    testImplementation platform("org.junit:junit-bom:${versions.junit}")
     testImplementation 'org.junit.jupiter:junit-jupiter'
 }
 
diff --git a/ownlang-core/build.gradle b/ownlang-core/build.gradle
index af68609..96e8bfb 100644
--- a/ownlang-core/build.gradle
+++ b/ownlang-core/build.gradle
@@ -6,9 +6,9 @@ group = 'com.annimon'
 version = '2.0-SNAPSHOT'
 
 dependencies {
-    implementation 'org.json:json:20230227'
+    implementation "org.json:json:${versions.json}"
 
-    testImplementation platform('org.junit:junit-bom:5.9.2')
+    testImplementation platform("org.junit:junit-bom:${versions.junit}")
     testImplementation 'org.junit.jupiter:junit-jupiter'
 }
 
diff --git a/ownlang-desktop/build.gradle b/ownlang-desktop/build.gradle
index 93ff3a0..87751b5 100644
--- a/ownlang-desktop/build.gradle
+++ b/ownlang-desktop/build.gradle
@@ -1,4 +1,5 @@
 plugins {
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
     id 'java'
     id 'application'
 }
@@ -16,7 +17,7 @@ dependencies {
     implementation project(":ownlang-utils")
     implementation project(":modules:main")
 
-    testImplementation platform('org.junit:junit-bom:5.9.2')
+    testImplementation platform("org.junit:junit-bom:${versions.junit}")
     testImplementation 'org.junit.jupiter:junit-jupiter'
 }
 
diff --git a/ownlang-parser/build.gradle b/ownlang-parser/build.gradle
index b380dd7..5e06268 100644
--- a/ownlang-parser/build.gradle
+++ b/ownlang-parser/build.gradle
@@ -6,13 +6,14 @@ group = 'com.annimon'
 version = '2.0-SNAPSHOT'
 
 dependencies {
-    api project(":ownlang-core")
+    api project(':ownlang-core')
 
-    testImplementation platform('org.junit:junit-bom:5.9.2')
-    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.9.2'
+    testImplementation project(':modules:main')
+    testImplementation platform("org.junit:junit-bom:${versions.junit}")
+    testImplementation "org.junit.jupiter:junit-jupiter-params:${versions.junit}"
     testImplementation 'org.junit.jupiter:junit-jupiter'
-    testImplementation 'org.openjdk.jmh:jmh-core:1.37'
-    testImplementation 'org.openjdk.jmh:jmh-generator-annprocess:1.37'
+    testImplementation "org.openjdk.jmh:jmh-core:${versions.jmh}"
+    testImplementation "org.openjdk.jmh:jmh-generator-annprocess:${versions.jmh}"
 }
 
 test {
diff --git a/ownlang-utils/build.gradle b/ownlang-utils/build.gradle
index 389808e..8a12b43 100644
--- a/ownlang-utils/build.gradle
+++ b/ownlang-utils/build.gradle
@@ -7,11 +7,11 @@ version = '2.0-SNAPSHOT'
 
 dependencies {
     api project(":ownlang-parser")
-    implementation 'org.json:json:20230227'
-    implementation 'org.yaml:snakeyaml:1.20'
-    implementation 'jline:jline:2.14.5'
+    implementation "org.json:json:${versions.json}"
+    implementation "org.yaml:snakeyaml:${versions.snakeyaml}"
+    implementation "jline:jline:${versions.jline}"
 
-    testImplementation platform('org.junit:junit-bom:5.9.2')
+    testImplementation platform("org.junit:junit-bom:${versions.junit}")
     testImplementation 'org.junit.jupiter:junit-jupiter'
 }