diff --git a/lib/tailwind_merge/config.rb b/lib/tailwind_merge/config.rb
index 30391ee..7090fff 100644
--- a/lib/tailwind_merge/config.rb
+++ b/lib/tailwind_merge/config.rb
@@ -769,8 +769,8 @@ module Config
           {
             "font" => [
               THEME_FONT_WEIGHT,
-              IS_ARBITRARY_VARIABLE,
-              IS_ARBITRARY_NUMBER,
+              IS_ARBITRARY_VARIABLE_WEIGHT,
+              IS_ARBITRARY_WEIGHT,
             ],
           },
         ],
@@ -799,7 +799,7 @@ module Config
         # Font Family
         # @see https://tailwindcss.com/docs/font-family
         ##
-        "font-family" => [{ "font" => [IS_ARBITRARY_VARIABLE_FAMILY_NAME, IS_ARBITRARY_VALUE, THEME_FONT] }],
+        "font-family" => [{ "font" => [IS_ARBITRARY_VARIABLE_FAMILY_NAME, IS_ARBITRARY_FAMILY_NAME, THEME_FONT] }],
         ##
         # Font Variant Numeric
         # @see https://tailwindcss.com/docs/font-variant-numeric
diff --git a/lib/tailwind_merge/validators.rb b/lib/tailwind_merge/validators.rb
index 8303be6..c37187e 100644
--- a/lib/tailwind_merge/validators.rb
+++ b/lib/tailwind_merge/validators.rb
@@ -102,6 +102,14 @@ def integer?(x)
       arbitrary_value?(value, IS_LABEL_NUMBER, IS_NUMBER)
     }
 
+    IS_ARBITRARY_WEIGHT = ->(value) {
+      arbitrary_value?(value, IS_LABEL_WEIGHT, IS_ANY)
+    }
+
+    IS_ARBITRARY_FAMILY_NAME = ->(value) {
+      arbitrary_value?(value, IS_LABEL_FAMILY_NAME, IS_NEVER)
+    }
+
     IS_ARBITRARY_POSITION = ->(value) {
       arbitrary_value?(value, IS_LABEL_POSITION, IS_NEVER)
     }
@@ -142,6 +150,10 @@ def integer?(x)
       arbitrary_variable?(value, IS_LABEL_SHADOW, should_match_no_label: true)
     }
 
+    IS_ARBITRARY_VARIABLE_WEIGHT = ->(value) {
+      arbitrary_variable?(value, IS_LABEL_WEIGHT, should_match_no_label: true)
+    }
+
     ############
     # Labels
     ############
@@ -170,6 +182,10 @@ def integer?(x)
       label == "family-name"
     }
 
+    IS_LABEL_WEIGHT = ->(label) {
+      label == "number" || label == "weight"
+    }
+
     IS_LABEL_SHADOW = ->(label) {
       label == "shadow"
     }
diff --git a/lib/tailwind_merge/version.rb b/lib/tailwind_merge/version.rb
index 26a6124..0c725bc 100644
--- a/lib/tailwind_merge/version.rb
+++ b/lib/tailwind_merge/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module TailwindMerge
-  VERSION = "1.3.2"
+  VERSION = "1.3.3"
 end
diff --git a/test/test_arbitrary_values.rb b/test/test_arbitrary_values.rb
index f6f491b..be159dd 100644
--- a/test/test_arbitrary_values.rb
+++ b/test/test_arbitrary_values.rb
@@ -52,10 +52,21 @@ def test_handles_ambiguous_arbitrary_values_correctly
     assert_equal("bg-[percentage:30%] bg-[length:200px_100px]", @merger.merge("bg-cover bg-[percentage:30%] bg-[size:200px_100px] bg-[length:200px_100px]"))
     assert_equal("bg-linear-to-r", @merger.merge("bg-none bg-[url(.)] bg-[image:.] bg-[url:.] bg-[linear-gradient(.)] bg-linear-to-r"))
     assert_equal("border-[color-mix(in_oklab,var(--background),var(--calendar-color)_30%)] border", @merger.merge("border-[color-mix(in_oklab,var(--background),var(--calendar-color)_30%)] border"))
+
+    assert_equal("font-[600]", @merger.merge("font-[400] font-[600]"))
+    assert_equal("font-[var(--b)]", @merger.merge("font-[var(--a)] font-[var(--b)]"))
+    assert_equal("font-[var(--b)]", @merger.merge("font-[weight:var(--a)] font-[var(--b)]"))
+    assert_equal("font-[weight:var(--b)]", @merger.merge("font-[400] font-[weight:var(--b)]"))
+    assert_equal("font-[weight:var(--b)]", @merger.merge("font-[weight:var(--a)] font-[weight:var(--b)]"))
+    assert_equal("font-[family-name:var(--a)] font-[var(--b)]", @merger.merge("font-[family-name:var(--a)] font-[var(--b)]"))
   end
 
   def test_handles_arbitrary_custom_properties_correctly
     assert_equal("bg-(--other-red) bg-(position:-my-pos)", @merger.merge("bg-red bg-(--other-red) bg-bottom bg-(position:-my-pos)"))
     assert_equal("shadow-(--some-other-shadow) shadow-(color:--some-color)", @merger.merge("shadow-xs shadow-(shadow:--something) shadow-red shadow-(--some-other-shadow) shadow-(color:--some-color)"))
+
+    assert_equal("font-(--b)", @merger.merge("font-(--a) font-(--b)"))
+    assert_equal("font-(--b)", @merger.merge("font-(weight:--a) font-(--b)"))
+    assert_equal("font-(family-name:--a) font-(--b)", @merger.merge("font-(family-name:--a) font-(--b)"))
   end
 end
diff --git a/test/test_validators.rb b/test/test_validators.rb
index 3a75bdd..6511305 100644
--- a/test/test_validators.rb
+++ b/test/test_validators.rb
@@ -25,6 +25,17 @@ def test_is_any_non_arbitrary
     refute(IS_ANY_NON_ARBITRARY.call("(label:test)"))
   end
 
+  def test_is_arbitrary_family_name
+    assert(IS_ARBITRARY_FAMILY_NAME.call("[family-name:Open_Sans]"))
+    assert(IS_ARBITRARY_FAMILY_NAME.call("[family-name:var(--my-font)]"))
+
+    refute(IS_ARBITRARY_FAMILY_NAME.call("[Open_Sans]"))
+    refute(IS_ARBITRARY_FAMILY_NAME.call("[number:400]"))
+    refute(IS_ARBITRARY_FAMILY_NAME.call("[weight:400]"))
+    refute(IS_ARBITRARY_FAMILY_NAME.call("family-name:test"))
+    refute(IS_ARBITRARY_FAMILY_NAME.call("(family-name:test)"))
+  end
+
   def test_is_arbitrary_image
     assert(IS_ARBITRARY_IMAGE.call("[url:var(--my-url)]"))
     assert(IS_ARBITRARY_IMAGE.call("[url(something)]"))
@@ -94,6 +105,19 @@ def test_is_arbitrary_shadow
     refute(IS_ARBITRARY_SHADOW.call("[something-else]"))
   end
 
+  def test_is_arbitrary_weight
+    assert(IS_ARBITRARY_WEIGHT.call("[weight:400]"))
+    assert(IS_ARBITRARY_WEIGHT.call("[weight:bold]"))
+    assert(IS_ARBITRARY_WEIGHT.call("[number:400]"))
+    assert(IS_ARBITRARY_WEIGHT.call("[number:var(--my-weight)]"))
+    assert(IS_ARBITRARY_WEIGHT.call("[400]"))
+    assert(IS_ARBITRARY_WEIGHT.call("[bold]"))
+
+    refute(IS_ARBITRARY_WEIGHT.call("[family-name:test]"))
+    refute(IS_ARBITRARY_WEIGHT.call("weight:400"))
+    refute(IS_ARBITRARY_WEIGHT.call("(weight:400)"))
+  end
+
   def test_is_arbitrary_size
     assert(IS_ARBITRARY_SIZE.call("[size:2px]"))
     assert(IS_ARBITRARY_SIZE.call("[size:bla]"))
@@ -186,6 +210,16 @@ def test_is_arbitrary_variable_size
     refute(IS_ARBITRARY_VARIABLE_SIZE.call("percentage:test"))
   end
 
+  def test_is_arbitrary_variable_weight
+    assert(IS_ARBITRARY_VARIABLE_WEIGHT.call("(weight:test)"))
+    assert(IS_ARBITRARY_VARIABLE_WEIGHT.call("(number:test)"))
+    assert(IS_ARBITRARY_VARIABLE_WEIGHT.call("(--my-weight)"))
+
+    refute(IS_ARBITRARY_VARIABLE_WEIGHT.call("(other:test)"))
+    refute(IS_ARBITRARY_VARIABLE_WEIGHT.call("weight:test"))
+    refute(IS_ARBITRARY_VARIABLE_WEIGHT.call("[weight:test]"))
+  end
+
   def test_is_fraction
     assert(IS_FRACTION.call("1/2"))
     assert(IS_FRACTION.call("123/209"))