diff --git a/pkgs/development/compilers/vala/default.nix b/pkgs/development/compilers/vala/default.nix
index 72512a1202f2..3bb0f4c9a4bd 100644
--- a/pkgs/development/compilers/vala/default.nix
+++ b/pkgs/development/compilers/vala/default.nix
@@ -20,6 +20,8 @@ let
 
         "0.54" = ./disable-graphviz-0.46.1.patch;
 
+        "0.55" = ./disable-graphviz-0.46.1.patch;
+
       }.${lib.versions.majorMinor version} or (throw "no graphviz patch for this version of vala");
 
     disableGraphviz = lib.versionAtLeast version "0.38" && !withGraphviz;
@@ -68,7 +70,10 @@ let
 
     passthru = {
       updateScript = gnome.updateScript {
-        attrPath = "${pname}_${lib.versions.major version}_${lib.versions.minor version}";
+        attrPath =
+          let
+            roundUpToEven = num: num + lib.mod num 2;
+          in "${pname}_${lib.versions.major version}_${builtins.toString (roundUpToEven (lib.toInt (lib.versions.minor version)))}";
         packageName = pname;
         freeze = true;
       };
@@ -94,5 +99,10 @@ in rec {
     sha256 = "Ygecof8C5dF65yqppa3GGuav3P67DZ8GBjo2776soMc=";
   };
 
+  vala_0_56 = generic {
+    version = "0.55.3";
+    sha256 = "wWGF59HyF4NqfOvGSar+g1ULt7GS+9Mn7eOIzSwtUEk=";
+  };
+
   vala = vala_0_54;
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 729654a23f7a..4d6d51ed5fef 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -13604,6 +13604,7 @@ with pkgs;
   inherit (callPackage ../development/compilers/vala { })
     vala_0_48
     vala_0_54
+    vala_0_56
     vala;
 
   vyper = with python3Packages; toPythonApplication vyper;