diff --git a/lib/prism/ffi.rb b/lib/prism/ffi.rb
index a0da0b6195..35b91e41b2 100644
--- a/lib/prism/ffi.rb
+++ b/lib/prism/ffi.rb
@@ -7,10 +7,6 @@
 require "rbconfig"
 require "ffi"
 
-# We want to eagerly load this file if there are Ractors so that it does not get
-# autoloaded from within a non-main Ractor.
-require "prism/serialize" if defined?(Ractor)
-
 module Prism
   module LibRubyParser # :nodoc:
     extend FFI::Library
@@ -163,9 +159,6 @@ module Prism
     class PrismString # :nodoc:
       SIZEOF = LibRubyParser.pm_string_sizeof
 
-      PLATFORM_EXPECTS_UTF8 =
-        RbConfig::CONFIG["host_os"].match?(/bccwin|cygwin|djgpp|mingw|mswin|wince|darwin/i)
-
       attr_reader :pointer, :length
 
       def initialize(pointer, length, from_string)
@@ -200,7 +193,8 @@ module Prism
         # On Windows and Mac, it's expected that filepaths will be encoded in
         # UTF-8. If they are not, we need to convert them to UTF-8 before
         # passing them into pm_string_mapped_init.
-        if PLATFORM_EXPECTS_UTF8 && (encoding = filepath.encoding) != Encoding::ASCII_8BIT && encoding != Encoding::UTF_8
+        if RbConfig::CONFIG["host_os"].match?(/bccwin|cygwin|djgpp|mingw|mswin|wince|darwin/i) &&
+           (encoding = filepath.encoding) != Encoding::ASCII_8BIT && encoding != Encoding::UTF_8
           filepath = filepath.encode(Encoding::UTF_8)
         end
 
@@ -229,7 +223,7 @@ module Prism
   private_constant :LibRubyParser
 
   # The version constant is set by reading the result of calling pm_version.
-  VERSION = LibRubyParser.pm_version.read_string.freeze
+  VERSION = LibRubyParser.pm_version.read_string
 
   class << self
     # Mirror the Prism.dump API by using the serialization API.
diff --git a/prism/extension.c b/prism/extension.c
index 1533ca7bb3..dca2ee67a1 100644
--- a/prism/extension.c
+++ b/prism/extension.c
@@ -1331,11 +1331,6 @@ Init_prism(void) {
         );
     }
 
-#ifdef HAVE_RB_EXT_RACTOR_SAFE
-    // Mark this extension as Ractor-safe.
-    rb_ext_ractor_safe(true);
-#endif
-
     // Grab up references to all of the constants that we're going to need to
     // reference throughout this extension.
     rb_cPrism = rb_define_module("Prism");
diff --git a/prism/templates/lib/prism/serialize.rb.erb b/prism/templates/lib/prism/serialize.rb.erb
index bc32e2fd4e..52821e0f7d 100644
--- a/prism/templates/lib/prism/serialize.rb.erb
+++ b/prism/templates/lib/prism/serialize.rb.erb
@@ -592,7 +592,7 @@ module Prism
       <%- tokens.each do |token| -%>
       <%= token.name.to_sym.inspect %>,
       <%- end -%>
-    ].freeze
+    ]
 
     private_constant :MAJOR_VERSION, :MINOR_VERSION, :PATCH_VERSION
     private_constant :ConstantPool, :FastStringIO, :Loader, :TOKEN_TYPES
diff --git a/test/prism/ractor_test.rb b/test/prism/ractor_test.rb
deleted file mode 100644
index e55a9e8c47..0000000000
--- a/test/prism/ractor_test.rb
+++ /dev/null
@@ -1,61 +0,0 @@
-# frozen_string_literal: true
-
-return unless defined?(Ractor)
-
-require_relative "test_helper"
-
-module Prism
-  class RactorTest < TestCase
-    def test_version
-      refute_nil(with_ractor { Prism::VERSION })
-    end
-
-    def test_parse_file
-      assert_kind_of(Prism::Result, with_ractor(__FILE__) { |filepath| Prism.parse_file(filepath) })
-    end
-
-    def test_lex_file
-      assert_kind_of(Prism::Result, with_ractor(__FILE__) { |filepath| Prism.lex_file(filepath) })
-    end
-
-    def test_parse_file_comments
-      assert_kind_of(Array, with_ractor(__FILE__) { |filepath| Prism.parse_file_comments(filepath) })
-    end
-
-    def test_parse_lex_file
-      assert_kind_of(Prism::Result, with_ractor(__FILE__) { |filepath| Prism.parse_lex_file(filepath) })
-    end
-
-    def test_parse_success
-      assert(with_ractor("1 + 1") { |source| Prism.parse_success?(source) })
-    end
-
-    def test_parse_failure
-      assert(with_ractor("1 +") { |source| Prism.parse_failure?(source) })
-    end
-
-    def test_string_query_local
-      assert(with_ractor("foo") { |source| StringQuery.local?(source) })
-    end
-
-    def test_string_query_constant
-      assert(with_ractor("FOO") { |source| StringQuery.constant?(source) })
-    end
-
-    def test_string_query_method_name
-      assert(with_ractor("foo?") { |source| StringQuery.method_name?(source) })
-    end
-
-    if !ENV["PRISM_BUILD_MINIMAL"]
-      def test_dump_file
-        assert_kind_of(String, with_ractor(__FILE__) { |filepath| Prism.dump_file(filepath) })
-      end
-    end
-
-    private
-
-    def with_ractor(*arguments, &block)
-      ignore_warnings { Ractor.new(*arguments, &block) }.take
-    end
-  end
-end