diff --git a/nix/lib/mkNerdFont.nix b/nix/lib/mkNerdFont.nix
index 9753577a..f8694d72 100644
--- a/nix/lib/mkNerdFont.nix
+++ b/nix/lib/mkNerdFont.nix
@@ -29,9 +29,7 @@ stdenvNoCC.mkDerivation {
     let
       args =
         lib.optionals useDefaultsArgs [
-          "--careful"
           "--complete"
-          "--quiet"
           "--no-progressbars"
         ]
         ++ extraArgs;
diff --git a/nix/overlays/iosevka.nix b/nix/overlays/iosevka.nix
index 2239f2ae..1295191f 100644
--- a/nix/overlays/iosevka.nix
+++ b/nix/overlays/iosevka.nix
@@ -9,7 +9,7 @@ final: prev: rec {
         font = iosevka;
         extraArgs = [
           "--name {/.}-NFM"
-          "--use-single-width-glyphs"
+          "--mono"
         ];
       };
     };
@@ -49,9 +49,9 @@ final: prev: rec {
       };
 
       weights = {
-        Regular.shape = 500;
-        Regular.menu = 500;
-        Regular.css = 500;
+        Regular.shape = 580;
+        Regular.menu = 580;
+        Regular.css = 580;
         Bold.shape = 700;
         Bold.menu = 700;
         Bold.css = 700;