diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe889e4..8b38680 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Thermal Changelog
 
+## v0.2.1 - 2026-02-17
+
+- Stargraphic: Add support for MiniMagick 5+.
+- Stargraphic: Ensure font is used correctly.
+
 ## v0.2.0 - 2025-03-12
 
 - Initial release of new Thermal gem.
diff --git a/lib/thermal/db/device.rb b/lib/thermal/db/device.rb
index 8a13c9a..f0535c6 100644
--- a/lib/thermal/db/device.rb
+++ b/lib/thermal/db/device.rb
@@ -71,7 +71,8 @@ def codepage_index
     end
 
     def charset_index
-      @charset_index ||= charsets.values.map! { |c| ::Thermal::Util.index_with(c.u_codepoints, c.key) }
+      @charset_index ||= charsets.values
+                                 .map! { |c| ::Thermal::Util.index_with(c.u_codepoints, c.key) }
                                  .reverse.inject(&:merge).freeze
     end
   end
diff --git a/lib/thermal/escpos/buffer.rb b/lib/thermal/escpos/buffer.rb
index 4ac47d5..56faeb9 100644
--- a/lib/thermal/escpos/buffer.rb
+++ b/lib/thermal/escpos/buffer.rb
@@ -90,8 +90,8 @@ def init_buffer!
 
     def ascii?(codepoint, extended: false)
       (codepoint == 10) ||
-        (codepoint >= 32 && codepoint <= 126) ||
-        (extended && codepoint >= 128 && codepoint <= 255)
+        codepoint.between?(32, 126) ||
+        (extended && codepoint.between?(128, 255))
     end
 
     def set_charset(charset) # rubocop:disable Naming/AccessorMethodName
diff --git a/lib/thermal/profile.rb b/lib/thermal/profile.rb
index 24baec6..e9d4b6e 100644
--- a/lib/thermal/profile.rb
+++ b/lib/thermal/profile.rb
@@ -13,7 +13,7 @@ class Profile
     CODEPOINTS_CJK_SKIP = [
       "\u2500".."\u259F", # box drawing + block elements
       "\u2660".."\u2667"  # card suits
-    ].map(&:to_a).flatten.join.each_codepoint.to_a.freeze
+    ].map(&:to_a).join.each_codepoint.to_a.freeze
 
     # These characters exist in the Katakana codepage,
     # but should use CJK encoding if available.
diff --git a/lib/thermal/stargraphic/writer.rb b/lib/thermal/stargraphic/writer.rb
index d486441..ea0023b 100644
--- a/lib/thermal/stargraphic/writer.rb
+++ b/lib/thermal/stargraphic/writer.rb
@@ -216,8 +216,11 @@ def font
     def text_image(markup, width: @width, align: :left, font: 'Sans', delete: true)
       tmp_path = ::Thermal.tmp_path("#{SecureRandom.uuid}.png")
 
+      # TODO: Fix font loading
+      # font ||= self.class.font
+
       begin
-        ::MiniMagick::Tool::Convert.new do |i|
+        configure = proc do |i|
           i << '+antialias'
           i << '+dither'
           i.size width
@@ -232,6 +235,12 @@ def text_image(markup, width: @width, align: :left, font: 'Sans', delete: true)
           i.negate
           i << tmp_path
         end
+
+        if ::MiniMagick.respond_to?(:convert) # MiniMagick 5+
+          ::MiniMagick.convert(&configure)
+        else
+          ::MiniMagick::Tool::Convert.new(&configure)
+        end
       rescue StandardError => e
         Bugsnag.notify(e) do |r|
           r.add_metadata('data',
diff --git a/lib/thermal/version.rb b/lib/thermal/version.rb
index f6fefbc..e8c525c 100644
--- a/lib/thermal/version.rb
+++ b/lib/thermal/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Thermal
-  VERSION = '0.2.0'
+  VERSION = '0.2.1'
 end