diff --git a/build.gradle b/build.gradle
index 47dd0d21..f06bb10d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,6 +33,11 @@ subprojects {
     mavenCentral()
   }
 
+  ext {
+    jacksonVersion = '2.9.6'
+    powermockVersion = '1.6.6'
+  }
+
   apply plugin: 'maven'
   apply plugin: 'maven-publish'
   apply plugin: 'java'
@@ -43,19 +48,18 @@ subprojects {
 
   //noinspection GroovyAssignabilityCheck
   dependencies {
-    compile 'com.fasterxml.jackson.core:jackson-core:2.4.2'
-    compile 'com.fasterxml.jackson.core:jackson-annotations:2.4.2'
-    compile 'com.fasterxml.jackson.core:jackson-databind:2.4.2'
-    compile 'com.google.guava:guava:17.0'
-    compile 'org.slf4j:slf4j-api:1.7.7'
-    compile 'commons-codec:commons-codec:1.9'
-    testCompile 'junit:junit:4.11'
-    testCompile 'org.powermock:powermock-module-junit4:1.6.6'
-    testCompile 'org.powermock:powermock-api-mockito:1.6.6'
+    compile "com.fasterxml.jackson.core:jackson-core:$jacksonVersion"
+    compile "com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion"
+    compile "com.fasterxml.jackson.core:jackson-databind:$jacksonVersion"
+    compile "com.google.guava:guava:17.0"
+    compile "org.slf4j:slf4j-api:1.7.25"
+    compile "commons-codec:commons-codec:1.9"
+    testCompile "junit:junit:4.12"
+    testCompile "org.powermock:powermock-module-junit4:$powermockVersion"
+    testCompile "org.powermock:powermock-api-mockito:$powermockVersion"
   }
 }
 
-
 task wrapper(type: Wrapper) {
   gradleVersion = '2.0'
 }