diff --git a/pkgs/development/coq-modules/relation-algebra/default.nix b/pkgs/development/coq-modules/relation-algebra/default.nix
index 01cb7f63b71..204be2931a5 100644
--- a/pkgs/development/coq-modules/relation-algebra/default.nix
+++ b/pkgs/development/coq-modules/relation-algebra/default.nix
@@ -5,8 +5,13 @@ mkCoqDerivation {
   pname = "relation-algebra";
   owner = "damien-pous";
 
-  releaseRev = v: "v${v}";
+  releaseRev = v:
+    if versions.isGe "1.7.6" v
+    then "v.${v}"
+    else "v${v}";
 
+  release."1.7.7".sha256 = "sha256:1dff3id6nypl2alhk9rcifj3dab0j78dym05blc525lawsmc26l2";
+  release."1.7.6".sha256 = "sha256:02gsj06zcy9zgd0h1ibqspwfiwm36pkkgg9cz37k4bxzcapxcr6w";
   release."1.7.5".sha256 = "sha256-XdO8agoJmNXPv8Ho+KTlLCB4oRlQsb0w06aM9M16ZBU=";
   release."1.7.4".sha256 = "sha256-o+v2CIAa2+9tJ/V8DneDTf4k31KMHycgMBLaQ+A4ufM=";
   release."1.7.3".sha256 = "sha256-4feSNfi7h4Yhwn5L+9KP9K1S7HCPvsvaVWwoQSTFvos=";
@@ -15,6 +20,8 @@ mkCoqDerivation {
 
   inherit version;
   defaultVersion = with versions; switch coq.coq-version [
+    { case = isEq "8.15"; out = "1.7.7"; }
+    { case = isEq "8.14"; out = "1.7.6"; }
     { case = isEq "8.13"; out = "1.7.5"; }
     { case = isEq "8.12"; out = "1.7.4"; }
     { case = isEq "8.11"; out = "1.7.3"; }