diff --git a/pkgs/development/coq-modules/coqtail-math/default.nix b/pkgs/development/coq-modules/coqtail-math/default.nix
index c9c3915414c3..3491e6b21f2f 100644
--- a/pkgs/development/coq-modules/coqtail-math/default.nix
+++ b/pkgs/development/coq-modules/coqtail-math/default.nix
@@ -6,7 +6,12 @@ mkCoqDerivation {
   pname = "coqtail-math";
   owner = "coq-community";
   inherit version;
-  defaultVersion = if versions.range "8.11" "8.13" coq.coq-version then "20201124" else null;
+  defaultVersion = with versions; switch coq.coq-version [
+    { case = range "8.11" "8.15"; out = "8.14"; }
+    { case = range "8.11" "8.13"; out = "20201124"; }
+  ] null;
+
+  release."8.14".sha256 = "sha256:1k8f8idjnx0mf4z479vcx55iz42rjxrbplbznv80m2famxakq03c";
   release."20201124".rev    = "5c22c3d7dcd8cf4c47cf84a281780f5915488e9e";
   release."20201124".sha256 = "sha256-wd+Lh7dpAD4zfpyKuztDmSFEZo5ZiFrR8ti2jUCVvoQ=";