diff --git a/flake.lock b/flake.lock
index 4eb0d97..a70f62a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1611948132,
-        "narHash": "sha256-mH7hD1ps1FcRaVdP36jZWZFHdESVPY5rdTNJR16z7D4=",
+        "lastModified": 1612545171,
+        "narHash": "sha256-AZkSuO7H055eDD4KWBEDCX/R5fvw0vUMCErvQvYSEhA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "aa48e205a2e0516ff4b96c79eeb666aaaccd418c",
+        "rev": "536fe36e23ab0fc8b7f35c24603422eee9fc17a2",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 122e467..a6b38d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -154,7 +154,7 @@
         # upstream Genode source repositories
         forAllLocalSystems (system:
           let
-            pkgs = nixpkgsFor.${system};
+            pkgs = nixpkgs.legacyPackages.${system};
             fhs = pkgs.buildFHSUserEnv {
               name = "genode-env";
               targetPkgs = pkgs:
@@ -168,7 +168,10 @@
                   gnumake
                   libxml2
                   qemu
+                  rpcsvc-proto
+                  subversion
                   tcl
+                  wget
                   which
                   xorriso
                 ]);