diff --git a/lib/BUCK b/lib/BUCK
index 6867754..33b6d50 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -312,19 +312,19 @@
 
 remote_jar (
   name = 'guava',
-  out = 'guava-20.0.jar',
-  url = 'mvn:com.google.guava:guava:jar:20.0',
-  sha1 = '89507701249388e1ed5ddcf8c41f4ce1be7831ef',
-  maven_coords = 'com.google.guava:guava:20.0',
+  out = 'guava-21.0.jar',
+  url = 'mvn:com.google.guava:guava:jar:21.0',
+  sha1 = '3a3d111be1be1b745edfa7d91678a12d7ed38709',
+  maven_coords = 'com.google.guava:guava:21.0',
   visibility = [ 'PUBLIC' ],
 )
 
 remote_jar (
   name = 'guava-testlib',
-  out = 'guava-testlib-20.0.jar',
-  url = 'mvn:com.google.guava:guava-testlib:jar:20.0',
-  sha1 = 'e3666edd0d7b10ddfa5242b998efd831e4b264ff',
-  maven_coords = 'com.google.guava:guava-testlib:jar:NON-OSGI:20.0',
+  out = 'guava-testlib-21.0.jar',
+  url = 'mvn:com.google.guava:guava-testlib:jar:21.0',
+  sha1 = '1ec77c45666cf17da76cd80725194148a8ffc440',
+  maven_coords = 'com.google.guava:guava-testlib:jar:NON-OSGI:21.0',
   visibility = [ 'PUBLIC' ],
 )
 
@@ -1279,3 +1279,4 @@
   maven_coords = 'org.apache.sshd:sshd-core:1.4.0',
   visibility = [ 'PUBLIC' ],
 )
+