diff --git a/pkgs/development/compilers/sbcl/src-for-default.nix b/pkgs/development/compilers/sbcl/src-for-default.nix
index 87fbdf54e8c..5c10638805d 100644
--- a/pkgs/development/compilers/sbcl/src-for-default.nix
+++ b/pkgs/development/compilers/sbcl/src-for-default.nix
@@ -1,9 +1,9 @@
 rec {
-   version="1.0.49";
-   name="sbcl-1.0.49";
-   hash="1s3am56vh1rr91zkdc5ba4rirc8ydnla3sgk8yhh56sd101c7q0v";
-   url="http://downloads.sourceforge.net/project/sbcl/sbcl/1.0.49/sbcl-1.0.49-source.tar.bz2";
-   advertisedUrl="http://downloads.sourceforge.net/project/sbcl/sbcl/1.0.49/sbcl-1.0.49-source.tar.bz2";
+   version="1.0.50";
+   name="sbcl-1.0.50";
+   hash="1asbb43rmrp87ia2kq66ymdlgdx3jvihlz3dlgwhlz7syd9z3wc3";
+   url="http://downloads.sourceforge.net/project/sbcl/sbcl/1.0.50/sbcl-1.0.50-source.tar.bz2";
+   advertisedUrl="http://downloads.sourceforge.net/project/sbcl/sbcl/1.0.50/sbcl-1.0.50-source.tar.bz2";
   
   
 }