diff --git a/pkgs/development/compilers/sbcl/default.nix b/pkgs/development/compilers/sbcl/default.nix
index 73d3cc08df88..78938c21cfc9 100644
--- a/pkgs/development/compilers/sbcl/default.nix
+++ b/pkgs/development/compilers/sbcl/default.nix
@@ -30,8 +30,8 @@ let
     "2.4.10".sha256 = "sha256-zus5a2nSkT7uBIQcKva+ylw0LOFGTD/j5FPy3hDF4vg=";
     # By unofficial and very loose convention we keep the latest version of
     # SBCL, and the previous one in case someone quickly needs to roll back.
-    "2.6.4".sha256 = "sha256-O6U+ZUtg/rfE9QRmGZ1tUmDyZhxxG6ItS3cLZVQA1Xs=";
     "2.6.5".sha256 = "sha256-kex19kclLtbmrq6bGhP0fHxs/ZtoSI3Gnxpv6lrMtEA=";
+    "2.6.6".sha256 = "sha256-plp6MIEqr1SSXRGSubnoEPUnx5kRxgALdUgQWu99o0s=";
   };
   # Collection of pre-built SBCL binaries for platforms that need them for
   # bootstrapping. Ideally these are to be avoided.  If ECL (or any other
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 63838e08073a..985a71a778cd 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7537,14 +7537,6 @@ with pkgs;
     ];
   };
 
-  sbcl_2_6_4 = wrapLisp {
-    pkg = callPackage ../development/compilers/sbcl { version = "2.6.4"; };
-    faslExt = "fasl";
-    flags = [
-      "--dynamic-space-size"
-      "3000"
-    ];
-  };
   sbcl_2_6_5 = wrapLisp {
     pkg = callPackage ../development/compilers/sbcl { version = "2.6.5"; };
     faslExt = "fasl";
@@ -7553,7 +7545,15 @@ with pkgs;
       "3000"
     ];
   };
-  sbcl = sbcl_2_6_5;
+  sbcl_2_6_6 = wrapLisp {
+    pkg = callPackage ../development/compilers/sbcl { version = "2.6.6"; };
+    faslExt = "fasl";
+    flags = [
+      "--dynamic-space-size"
+      "3000"
+    ];
+  };
+  sbcl = sbcl_2_6_6;
 
   sbclPackages = recurseIntoAttrs sbcl.pkgs;