diff --git a/pkgs/servers/firebird/default.nix b/pkgs/servers/firebird/default.nix
index 2fc31f9e49c9..abd40fef2139 100644
--- a/pkgs/servers/firebird/default.nix
+++ b/pkgs/servers/firebird/default.nix
@@ -70,13 +70,13 @@ let base = {
   });
 
   firebird_4 = stdenv.mkDerivation (base // rec {
-    version = "4.0.2";
+    version = "4.0.5";
 
     src = fetchFromGitHub {
       owner = "FirebirdSQL";
       repo = "firebird";
       rev = "v${version}";
-      sha256 = "sha256-hddW/cozboGw693q4k5f4+x9ccQFWFytXPUaBVkFnL4=";
+      hash = "sha256-OxkPpmnYTl65ns+hKHJd5IAPUiMj0g3HUpyRpwDNut8=";
     };
 
     buildInputs = base.buildInputs ++ [ zlib unzip libtommath libtomcrypt ];