diff --git a/lib/fusesocLib.nix b/lib/fusesocLib.nix
index 96db7c1..8ef707e 100644
--- a/lib/fusesocLib.nix
+++ b/lib/fusesocLib.nix
@@ -209,15 +209,11 @@ rec {
           defaultCore.overrideAttrs (
             _: prevAttrs: {
               passthru =
-                (removeAttrs prev (
-                  builtins.filter (n: isNull (builtins.match "^[[:digit:]]+.*$" n)) (lib.attrNames prev)
-                ))
+                # copy previous core versions
+                (lib.filterAttrs (n: _: !(isNull (builtins.match "^[[:digit:]]+.*$" n))) prev)
                 // prevAttrs.passthru
                 // {
                   ${coreDrv.version} = coreDrv;
-                  list = builtins.sort (p: q: lib.versionOlder p.version q.version) (
-                    [ coreDrv ] ++ (prev.list or [ ])
-                  ); # descending
                 };
             }
           );
diff --git a/lib/importCore.nix b/lib/importCore.nix
index d9e9a67..33cb577 100644
--- a/lib/importCore.nix
+++ b/lib/importCore.nix
@@ -52,7 +52,7 @@ lib.extendMkDerivation {
           library
           name
         ]);
-      version = parsed.version;
+      inherit (finalAttrs.passthru.parsed) version;
       passthru = passthru // {
         withTools =
           toolList:
@@ -68,10 +68,17 @@ lib.extendMkDerivation {
           finalAttrs.finalPackage.overrideAttrs (
             final: prev: {
               passthru = prev.passthru // {
-                dependencies = prev.passthru.dependencies ++ (resolveDeps finalAttrs.finalPackage coreSet);
+                dependencies = resolveDeps finalAttrs.finalPackage coreSet;
               };
             }
           );
+        list = builtins.sort (p: q: lib.versionOlder p.version q.version) (
+          lib.mapAttrsToList (_: v: v) (
+            lib.filterAttrs (n: _: !(isNull (builtins.match "^[[:digit:]]+.*$" n))) (
+              { ${finalAttrs.passthru.parsed.version} = finalAttrs.finalPackage; } // finalAttrs.passthru
+            )
+          )
+        );
         inherit
           dependencies
           parsed