diff --git a/build.gradle b/build.gradle
index 674903596..5f5caa23e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,6 +15,12 @@ allprojects {
         jcenter()
         maven { url "https://jitpack.io" }
     }
+
+    ext {
+        nanojsonVersion = "1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751"
+        spotbugsVersion = "4.2.3"
+        junitVersion = "4.13.2"
+    }
 }
 
 dependencies {
diff --git a/extractor/build.gradle b/extractor/build.gradle
index c1c11a05a..fb1186376 100644
--- a/extractor/build.gradle
+++ b/extractor/build.gradle
@@ -8,13 +8,13 @@ test {
 dependencies {
     implementation project(':timeago-parser')
 
-    implementation 'com.github.TeamNewPipe:nanojson:1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751'
+    implementation "com.github.TeamNewPipe:nanojson:$nanojsonVersion"
     implementation 'org.jsoup:jsoup:1.13.1'
     implementation 'org.mozilla:rhino:1.7.13'
-    implementation 'com.github.spotbugs:spotbugs-annotations:4.2.3'
+    implementation "com.github.spotbugs:spotbugs-annotations:$spotbugsVersion"
     implementation 'org.nibor.autolink:autolink:0.10.0'
 
-    testImplementation 'junit:junit:4.13.2'
+    testImplementation "junit:junit:$junitVersion"
     testImplementation "com.squareup.okhttp3:okhttp:3.12.13"
     testImplementation 'com.google.code.gson:gson:2.8.7'
 }
diff --git a/timeago-parser/build.gradle b/timeago-parser/build.gradle
index 1a5bc9719..2f761e579 100644
--- a/timeago-parser/build.gradle
+++ b/timeago-parser/build.gradle
@@ -1,6 +1,6 @@
 dependencies {
-    testImplementation 'junit:junit:4.13.1'
+    testImplementation "junit:junit:$junitVersion"
 
-    implementation 'com.github.TeamNewPipe:nanojson:1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751'
-    implementation 'com.github.spotbugs:spotbugs-annotations:4.2.3'
+    implementation "com.github.TeamNewPipe:nanojson:$nanojsonVersion"
+    implementation "com.github.spotbugs:spotbugs-annotations:$spotbugsVersion"
 }