diff --git a/.nix/coq-nix-toolbox.nix b/.nix/coq-nix-toolbox.nix
index 71ff6cb..f315508 100644
--- a/.nix/coq-nix-toolbox.nix
+++ b/.nix/coq-nix-toolbox.nix
@@ -1 +1 @@
-"f0c74efcec0d8657e1d5bcc6fd431b7caee1e43d"
+"42df08846e50cc096c17af59110df547068557dc"
diff --git a/.nix/rocq-overlays/odd-order/default.nix b/.nix/rocq-overlays/odd-order/default.nix
deleted file mode 100644
index c906843..0000000
--- a/.nix/rocq-overlays/odd-order/default.nix
+++ /dev/null
@@ -1,59 +0,0 @@
-{
-  lib,
-  coq,
-  mkRocqDerivation,
-  mathcomp-group-representation,
-  version ? null,
-}:
-
-mkRocqDerivation {
-  pname = "odd-order";
-  owner = "math-comp";
-
-  release."2.4.0".hash = "sha256-8U3xFKe/gBSapwNRix3i2+jbyTja5xXGnQwtiTiF+9w=";
-  release."2.3.0".hash = "sha256-53FG8I9O+tsIlmaa9qy6VYyJNwWfGmhavKhbZ0VqAGc=";
-  release."2.2.0".hash = "sha256-z0C7+wtY8NpoT8wYqHiy8mB2HPYAeJndzDmf7Bb0mg8=";
-  release."2.1.0".hash = "sha256-TPlaQbO0yXEpUgy3rlCx/w1MSLECJk5tdU26fAGe48Q=";
-  release."1.14.0".hash = "sha256:0iln70npkvixqyz469l6nry545a15jlaix532i1l7pzfkqqn6v68";
-  release."1.13.0".hash = "sha256-EzNKR/JzM8T17sMhPhgZNs14e50X4dY3OwFi133IsT0=";
-  release."1.12.0".hash = "sha256-omsfdc294CxKAHNMMeqJCcVimvyRCHgxcQ4NJOWSfNM=";
-  releaseRev = v: "mathcomp-odd-order.${v}";
-
-  inherit version;
-  defaultVersion =
-    let
-      case = coq: mc: out: {
-        cases = [
-          coq
-          mc
-        ];
-        inherit out;
-      };
-    in
-    with lib.versions;
-    lib.switch
-      [ coq.coq-version mathcomp-group-representation.version ]
-      [
-        (case (range "9.1" "9.3") (range "2.5" "2.6") "2.4.0")
-        (case (range "9.0" "9.1") (range "2.5" "2.5") "2.3.0")
-        (case (range "8.16" "9.1") (range "2.2.0" "2.4.0") "2.2.0")
-        (case (range "8.16" "9.0") (range "2.1.0" "2.3.0") "2.1.0")
-        (case (range "8.11" "8.16") (range "1.13.0" "1.15.0") "1.14.0")
-        (case (range "8.10" "8.15") (range "1.12.0" "1.14.0") "1.13.0")
-        (case (range "8.10" "8.14") (range "1.10.0" "1.12.0") "1.12.0")
-      ]
-      null;
-
-  useCoqifVersion = v: v != null && v != "dev" && lib.versions.isLe "2.4.0" v;
-
-  propagatedBuildInputs = [
-    mathcomp-group-representation
-  ];
-
-  meta = {
-    description = "Formal proof of the Odd Order Theorem";
-    maintainers = with lib.maintainers; [ siraben ];
-    license = lib.licenses.cecill-b;
-    platforms = lib.platforms.unix;
-  };
-}