diff --git a/pkgs/development/coq-modules/tlc/default.nix b/pkgs/development/coq-modules/tlc/default.nix
index 1e212b44e72..e129e016edf 100644
--- a/pkgs/development/coq-modules/tlc/default.nix
+++ b/pkgs/development/coq-modules/tlc/default.nix
@@ -6,10 +6,12 @@ with lib; (mkCoqDerivation {
   inherit version;
   displayVersion = { tlc = false; };
   defaultVersion = with versions; switch coq.coq-version [
+    { case = range "8.13" "8.15"; out = "20211215"; }
     { case = range "8.12" "8.13"; out = "20210316"; }
     { case = range "8.10" "8.12"; out = "20200328"; }
     { case = range "8.6"  "8.12"; out = "20181116"; }
   ] null;
+  release."20211215".sha256 = "sha256:0m4d4jhdcyq8p2gpz9j3nd6jqzmz2bjmbpc0q06b38b8i550mamp";
   release."20210316".sha256 = "1hlavnx20lxpf2iydbbxqmim9p8wdwv4phzp9ypij93yivih0g4a";
   release."20200328".sha256 = "16vzild9gni8zhgb3qhmka47f8zagdh03k6nssif7drpim8233lx";
   release."20181116".sha256 = "032lrbkxqm9d3fhf6nv1kq2z0mqd3czv3ijlbsjwnfh12xck4vpl";