diff --git a/nix/configurations/vanadium/home/dev.nix b/nix/configurations/vanadium/home/dev.nix
index 9a83b6d6..5d3b2068 100644
--- a/nix/configurations/vanadium/home/dev.nix
+++ b/nix/configurations/vanadium/home/dev.nix
@@ -97,6 +97,11 @@
           path = "ghc/ghc.git";
           contents = blameIgnore;
         }
+        {
+          url = "github.com";
+          path = "haskell/cabal.git";
+          contents = blameIgnore;
+        }
       ];
   };
 
@@ -112,15 +117,17 @@
 
   nix = {
     settings = {
-      # extra-substituters = [
-      #   "https://ghc-nix.cachix.org"
-      #   "https://haskell-language-server.cachix.org"
-      #   "https://helix.cachix.org"
-      # ];
+      extra-substituters = [
+        "https://ghc-nix.cachix.org"
+        "https://haskell-language-server.cachix.org"
+        "https://helix.cachix.org"
+        "https://cache.iog.io"
+      ];
       extra-trusted-public-keys = [
         "ghc-nix.cachix.org-1:ziC/I4BPqeA4VbtOFpFpu6D1t6ymFvRWke/lc2+qjcg="
         "haskell-language-server.cachix.org-1:juFfHrwkOxqIOZShtC4YC1uT1bBcq2RSvC7OMKx0Nz8="
         "helix.cachix.org-1:ejp9KQpR1FBI2onstMQ34yogDm4OgU2ru6lIwPvuCVs="
+        "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
       ];
     };
   };
diff --git a/nix/homeModules/common/user-nixconf.nix b/nix/homeModules/common/user-nixconf.nix
index c5096654..574a939e 100644
--- a/nix/homeModules/common/user-nixconf.nix
+++ b/nix/homeModules/common/user-nixconf.nix
@@ -8,7 +8,6 @@
     package = lib.mkDefault (nixosConfig.nix.package or pkgs.nix);
 
     settings = {
-      allow-import-from-derivation = "true";
       extra-substituters = [
         "https://nix-community.cachix.org"
         "https://leana8959.cachix.org"
@@ -25,14 +24,11 @@
         "nix-command"
         "flakes"
       ];
-      keep-outputs = true; # Build time derivations and sources
-    };
+      allow-import-from-derivation = true;
+      keep-outputs = false; # Build time derivations and sources
 
-    registry.flakies = {
-      from.id = "flakies";
-      from.type = "indirect";
-      to.type = "git";
-      to.url = "https://git.confusedcompiler.org/leana8959/flakies";
+      http-connections = 50; # default: 25
+      max-substitution-jobs = 32; # default: 16
     };
   };
 }
diff --git a/nix/packages/by-name/ruler/package.nix b/nix/packages/by-name/ruler/package.nix
index eae02c50..e9e58d14 100644
--- a/nix/packages/by-name/ruler/package.nix
+++ b/nix/packages/by-name/ruler/package.nix
@@ -12,8 +12,8 @@
       domain = "git.confusedcompiler.org";
       owner = "leana8959";
       repo = "ruler";
-      rev = "03f7b0bb545a59ddc031c08879eaf7e08dea1bef";
-      hash = "sha256-ZNE2IR9f9zDS1t10bHqabXQiAq9aibfeQOo1pJtKUn0=";
+      rev = "bb254a5a42f2f0a9e9c35230cc6a4ea4ad07ba8b";
+      hash = "sha256-LjVC54HepbZUfGzQXMEowSrD63LqyN4q7aszr9sUZvc=";
     })
     {};