diff --git a/Userland/Libraries/LibWeb/CSS/Serialize.cpp b/Userland/Libraries/LibWeb/CSS/Serialize.cpp
index fee6e61de4..22d6d9e512 100644
--- a/Userland/Libraries/LibWeb/CSS/Serialize.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Serialize.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -131,7 +131,7 @@ void serialize_a_local(StringBuilder& builder, StringView path)
 void serialize_unicode_ranges(StringBuilder& builder, Vector<UnicodeRange> const& unicode_ranges)
 {
     serialize_a_comma_separated_list(builder, unicode_ranges, [&](UnicodeRange unicode_range) {
-        serialize_a_string(builder, unicode_range.to_deprecated_string());
+        serialize_a_string(builder, unicode_range.to_string().release_value_but_fixme_should_propagate_errors());
     });
 }
 
diff --git a/Userland/Libraries/LibWeb/CSS/UnicodeRange.h b/Userland/Libraries/LibWeb/CSS/UnicodeRange.h
index 4443e3d6cb..76c829eae2 100644
--- a/Userland/Libraries/LibWeb/CSS/UnicodeRange.h
+++ b/Userland/Libraries/LibWeb/CSS/UnicodeRange.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -7,7 +7,7 @@
 #pragma once
 
 #include <AK/Assertions.h>
-#include <AK/DeprecatedString.h>
+#include <AK/String.h>
 
 namespace Web::CSS {
 
@@ -29,11 +29,11 @@ public:
         return m_min_code_point <= code_point && code_point <= m_max_code_point;
     }
 
-    DeprecatedString to_deprecated_string() const
+    ErrorOr<String> to_string() const
     {
         if (m_min_code_point == m_max_code_point)
-            return DeprecatedString::formatted("U+{:x}", m_min_code_point);
-        return DeprecatedString::formatted("U+{:x}-{:x}", m_min_code_point, m_max_code_point);
+            return String::formatted("U+{:x}", m_min_code_point);
+        return String::formatted("U+{:x}-{:x}", m_min_code_point, m_max_code_point);
     }
 
 private:
diff --git a/Userland/Libraries/LibWeb/Dump.cpp b/Userland/Libraries/LibWeb/Dump.cpp
index 4f02ccc9ef..518178c7c6 100644
--- a/Userland/Libraries/LibWeb/Dump.cpp
+++ b/Userland/Libraries/LibWeb/Dump.cpp
@@ -606,7 +606,7 @@ void dump_font_face_rule(StringBuilder& builder, CSS::CSSFontFaceRule const& rul
     builder.append("unicode-ranges:\n"sv);
     for (auto const& unicode_range : font_face.unicode_ranges()) {
         indent(builder, indent_levels + 2);
-        builder.appendff("{}\n", unicode_range.to_deprecated_string());
+        builder.appendff("{}\n", unicode_range.to_string().release_value_but_fixme_should_propagate_errors());
     }
 }