diff --git a/pkgs/applications/science/math/msieve/default.nix b/pkgs/applications/science/math/msieve/default.nix
index bda3e5b3a040..a5af9e844eca 100644
--- a/pkgs/applications/science/math/msieve/default.nix
+++ b/pkgs/applications/science/math/msieve/default.nix
@@ -2,12 +2,12 @@
 
 stdenv.mkDerivation rec {
   pname = "msieve";
-  version = "r1050";
+  version = "1056";
 
   src = fetchsvn {
     url = "svn://svn.code.sf.net/p/msieve/code/trunk";
-    rev = "1050";
-    hash = "sha256-cn6OhE4zhrpB7BFrRdOnucjATbfo5mLkK7O0Usx1quE=";
+    rev = version;
+    hash = "sha256-6ErVn4pYPMG5VFjOQURLsHNpN0pGdp55+rjY8988onU=";
   };
 
   buildInputs = [ zlib gmp ecm ];