diff --git a/.gitignore b/.gitignore
index 864d907..8eda4f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,4 @@
 /eigen-3.2.9.tar.bz2
 /eigen-3.2.10.tar.bz2
 /3.3.0.tar.bz2
+/3.3.1.tar.bz2
diff --git a/sources b/sources
index 1fdbf72..e8e83be 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-fd1ecefaacc9223958b6a66f9a348424  3.3.0.tar.bz2
+SHA512 (3.3.1.tar.bz2) = d679bc04279bad351a35caeb04c4a95ebdd7d69153209573603e0c4c1d15b0c4d23d74f8651928ad04d7f03ad132fa7184d662801be75f58be38fd78802c7724