diff --git a/giraph-block-app/pom.xml b/giraph-block-app/pom.xml
index 21ce0a6..ae3d445 100644
--- a/giraph-block-app/pom.xml
+++ b/giraph-block-app/pom.xml
@@ -103,10 +103,6 @@
       <artifactId>guava</artifactId>
     </dependency>
     <dependency>
-      <groupId>org.python</groupId>
-      <artifactId>jython</artifactId>
-    </dependency>
-    <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
     </dependency>
diff --git a/giraph-block-app/src/main/java/org/apache/giraph/block_app/framework/internal/BlockMasterLogic.java b/giraph-block-app/src/main/java/org/apache/giraph/block_app/framework/internal/BlockMasterLogic.java
index b6167d9..423929e 100644
--- a/giraph-block-app/src/main/java/org/apache/giraph/block_app/framework/internal/BlockMasterLogic.java
+++ b/giraph-block-app/src/main/java/org/apache/giraph/block_app/framework/internal/BlockMasterLogic.java
@@ -36,7 +36,7 @@
 import org.apache.giraph.function.Consumer;
 import org.apache.giraph.writable.tuple.IntLongWritable;
 import org.apache.log4j.Logger;
-import org.python.google.common.base.Preconditions;
+import com.google.common.base.Preconditions;
 
 /**
  * Block execution logic on master, iterating over Pieces of the
diff --git a/giraph-block-app/src/test/java/org/apache/giraph/block_app/framework/BlockExecutionTest.java b/giraph-block-app/src/test/java/org/apache/giraph/block_app/framework/BlockExecutionTest.java
index 00c5fb1..4913749 100644
--- a/giraph-block-app/src/test/java/org/apache/giraph/block_app/framework/BlockExecutionTest.java
+++ b/giraph-block-app/src/test/java/org/apache/giraph/block_app/framework/BlockExecutionTest.java
@@ -46,7 +46,7 @@
 import org.apache.hadoop.io.WritableComparable;
 import org.junit.Assert;
 import org.junit.Test;
-import org.python.google.common.collect.Iterables;
+import com.google.common.collect.Iterables;
 
 /**
  * Test of barebones of Blocks Framework.
diff --git a/giraph-core/src/main/java/org/apache/giraph/conf/DefaultMessageClasses.java b/giraph-core/src/main/java/org/apache/giraph/conf/DefaultMessageClasses.java
index a2ddf0e..c402059 100644
--- a/giraph-core/src/main/java/org/apache/giraph/conf/DefaultMessageClasses.java
+++ b/giraph-core/src/main/java/org/apache/giraph/conf/DefaultMessageClasses.java
@@ -29,7 +29,7 @@
 import org.apache.giraph.utils.WritableUtils;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.WritableComparable;
-import org.python.google.common.base.Preconditions;
+import com.google.common.base.Preconditions;
 
 /**
  * Default implementation of MessageClasses
diff --git a/giraph-core/src/main/java/org/apache/giraph/master/SuperstepClasses.java b/giraph-core/src/main/java/org/apache/giraph/master/SuperstepClasses.java
index 8653c96..8b521c7 100644
--- a/giraph-core/src/main/java/org/apache/giraph/master/SuperstepClasses.java
+++ b/giraph-core/src/main/java/org/apache/giraph/master/SuperstepClasses.java
@@ -37,7 +37,7 @@
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.WritableComparable;
 import org.apache.log4j.Logger;
-import org.python.google.common.base.Preconditions;
+import com.google.common.base.Preconditions;
 
 /**
  * Holds Computation and MessageCombiner class.
diff --git a/giraph-core/src/main/java/org/apache/giraph/reducers/impl/PairReduce.java b/giraph-core/src/main/java/org/apache/giraph/reducers/impl/PairReduce.java
index 1aea293..f9e57ca 100644
--- a/giraph-core/src/main/java/org/apache/giraph/reducers/impl/PairReduce.java
+++ b/giraph-core/src/main/java/org/apache/giraph/reducers/impl/PairReduce.java
@@ -26,7 +26,7 @@
 import org.apache.giraph.utils.WritableUtils;
 import org.apache.giraph.writable.tuple.PairWritable;
 import org.apache.hadoop.io.Writable;
-import org.python.google.common.base.Preconditions;
+import com.google.common.base.Preconditions;
 
 /**
  * Combines two individual reducers, to create a single reducer of pairs that
diff --git a/giraph-core/src/main/java/org/apache/giraph/worker/AllWorkersInfo.java b/giraph-core/src/main/java/org/apache/giraph/worker/AllWorkersInfo.java
index 0112134..32cc8c5 100644
--- a/giraph-core/src/main/java/org/apache/giraph/worker/AllWorkersInfo.java
+++ b/giraph-core/src/main/java/org/apache/giraph/worker/AllWorkersInfo.java
@@ -20,7 +20,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-import org.python.google.common.base.Preconditions;
+import com.google.common.base.Preconditions;
 
 import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;