diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 54d9f48..2ddb633 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -19,7 +19,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ["3.0", "3.1", "3.2"]
+        ruby: ["3.0", "3.1", "3.2", "3.3"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/lib/live_ast/common.rb b/lib/live_ast/common.rb
index 9cea0fd..5807023 100644
--- a/lib/live_ast/common.rb
+++ b/lib/live_ast/common.rb
@@ -14,6 +14,8 @@ def arg_to_str(arg)
     end
 
     def arg_to_str2(arg)
+      return "" if arg.nil? && RUBY_VERSION >= "3.3.0"
+
       arg.to_str
     rescue NameError
       thing = arg&.class
@@ -47,8 +49,10 @@ def location_for_eval(bind, filename = nil, lineno = nil)
       if filename
         lineno ||= 1
         [filename, lineno]
+      elsif RUBY_VERSION >= "3.3.0"
+        file, line = bind.source_location
+        ["(eval at #{file}:#{line})", 1]
       else
-        bind.source_location
         ["(eval)", 1]
       end
     end
diff --git a/lib/live_ast/linker.rb b/lib/live_ast/linker.rb
index e79c5c5..0869cc2 100644
--- a/lib/live_ast/linker.rb
+++ b/lib/live_ast/linker.rb
@@ -74,6 +74,7 @@ def find_method_ast(klass, name, *location)
       def find_ast(*location)
         raise ASTNotFoundError unless location.size == 2
         raise RawEvalError if location.first == "(eval)"
+        raise RawEvalError if location.first.match?(/^\(eval at .*\)$/) # Ruby 3.3
         raise ASTNotFoundError if location.first == "<internal:prelude>"
 
         ast = fetch_from_cache(*location)
diff --git a/test/backtrace_test.rb b/test/backtrace_test.rb
index 31ba3f5..71d8caa 100644
--- a/test/backtrace_test.rb
+++ b/test/backtrace_test.rb
@@ -51,7 +51,14 @@ def test_raise_no_overrides
         RUBY
       end
 
-      assert_equal orig.first, live.first
+      if RUBY_VERSION >= "3.3.0"
+        expected = orig.first.sub(/:[0-9]+\)/, ":LINE)")
+        actual = live.first.sub(/:[0-9]+\)/, ":LINE)")
+
+        assert_equal expected, actual
+      else
+        assert_equal orig.first, live.first
+      end
     end
   end
 
diff --git a/test/caller_test.rb b/test/caller_test.rb
index a66448b..173713b 100644
--- a/test/caller_test.rb
+++ b/test/caller_test.rb
@@ -31,6 +31,9 @@ def raise_after_eval(code, will_succeed)
       foo
     RUBY
 
+    orig.shift if orig.first.start_with? "<internal"
+    live.shift if live.first.start_with? "<internal"
+
     orig_top = orig.first
     live_top = live.first
 
diff --git a/test/full/replace_eval_test.rb b/test/full/replace_eval_test.rb
index 1127677..b8652ca 100644
--- a/test/full/replace_eval_test.rb
+++ b/test/full/replace_eval_test.rb
@@ -173,6 +173,8 @@ def test_instance_eval_code_argument_type_error_no_block
   end
 
   def test_instance_eval_filename_argument_nil_type_error_no_block
+    skip "nil is an acceptable filename argument in Ruby 3.3" if RUBY_VERSION >= "3.3.0"
+
     orig = assert_raises TypeError do
       Object.new.live_ast_original_instance_eval("1", nil)
     end
@@ -184,6 +186,15 @@ def test_instance_eval_filename_argument_nil_type_error_no_block
     assert_equal orig.class, live.class
   end
 
+  def test_instance_eval_filename_argument_nil_ruby_3_3_no_block
+    unless RUBY_VERSION >= "3.3.0"
+      skip "nil is not an acceptable filename argument before Ruby 3.3"
+    end
+
+    assert_equal 1, Object.new.live_ast_original_instance_eval("1", nil)
+    assert_equal 1, Object.new.instance_eval("1", nil)
+  end
+
   def test_instance_eval_filename_argument_conversion_type_error_no_block
     orig = assert_raises TypeError do
       Object.new.live_ast_original_instance_eval("1", 23)
@@ -360,6 +371,7 @@ def test_module_eval_file_line
   def test_module_eval_to_str
     file = Minitest::Mock.new
     file.expect(:to_str, "zebra.rb")
+    file.expect(:nil?, false)
     Class.new.module_eval("33 + 44", file)
     file.verify
   end
@@ -404,33 +416,43 @@ def test_local_var_collision
   end
 
   def test_eval_location_without_binding
-    expected = ["(eval)", 2]
+    expected_file = if RUBY_VERSION >= "3.3.0"
+                      /^\(eval at #{__FILE__}:[0-9]+\)$/
+                    else
+                      /^\(eval\)$/
+                    end
 
-    assert_equal expected, live_ast_original_eval("\n[__FILE__, __LINE__]")
+    file, line = live_ast_original_eval("\n[__FILE__, __LINE__]")
 
-    unfixable do
-      assert_equal expected, eval("\n[__FILE__, __LINE__]")
-    end
+    assert_match expected_file, file
+    assert_equal 2, line
 
     file, line = eval("\n[__FILE__, __LINE__]")
-    file = LiveAST.strip_token file
+    adjusted_file = LiveAST.strip_token file
 
-    assert_equal expected, [file, line]
+    refute_match expected_file, file
+    assert_match expected_file, adjusted_file
+    assert_equal 2, line
   end
 
   def test_eval_location_with_binding
-    expected = ["(eval)", 2]
+    expected_file = if RUBY_VERSION >= "3.3.0"
+                      /^\(eval at #{__FILE__}:[0-9]+\)$/
+                    else
+                      /^\(eval\)$/
+                    end
 
-    assert_equal expected, live_ast_original_eval("\n[__FILE__, __LINE__]", binding)
+    file, line = live_ast_original_eval("\n[__FILE__, __LINE__]", binding)
 
-    unfixable do
-      assert_equal expected, eval("\n[__FILE__, __LINE__]", binding)
-    end
+    assert_match expected_file, file
+    assert_equal 2, line
 
     file, line = eval("\n[__FILE__, __LINE__]", binding)
-    file = LiveAST.strip_token file
+    adjusted_file = LiveAST.strip_token file
 
-    assert_equal expected, [file, line]
+    refute_match expected_file, file
+    assert_match expected_file, adjusted_file
+    assert_equal 2, line
   end
 
   DEFINE_BO_TEST = lambda do