diff --git a/pkgs/development/coq-modules/gappalib/default.nix b/pkgs/development/coq-modules/gappalib/default.nix
index ffdb5193ae36..83285d187f46 100644
--- a/pkgs/development/coq-modules/gappalib/default.nix
+++ b/pkgs/development/coq-modules/gappalib/default.nix
@@ -6,7 +6,8 @@ mkCoqDerivation {
   owner = "gappa";
   domain = "gitlab.inria.fr";
   inherit version;
-  defaultVersion = if lib.versions.range "8.8" "8.18" coq.coq-version then "1.5.4" else null;
+  defaultVersion = if lib.versions.range "8.8" "8.19" coq.coq-version then "1.5.5" else null;
+  release."1.5.5".sha256 = "sha256-qxi2Kg3N3o6+ncq7aPNEg98dBmQC5WCa86zROPJSDdo=";
   release."1.5.4".sha256 = "sha256-9PlkXqCu4rbFD7qnMF1GSpPCVmwJ3r593RfAvkJbbdA=";
   release."1.5.3".sha256 = "sha256-SuMopX5sm4jh2uBuE7zr6vhWhHYZYnab+epjqYJqg+s=";
   release."1.5.2".sha256 = "sha256-A021Bhqz5r2CZBayfjIiWrCIfUlejcQAfbTmOaf6QTM=";