diff --git a/lib/truffle/pathname.rb b/lib/truffle/pathname.rb
index 40d395d02f35..286d2df22953 100644
--- a/lib/truffle/pathname.rb
+++ b/lib/truffle/pathname.rb
@@ -806,26 +806,26 @@ class Pathname    # * IO *
   #
   # This method has existed since 1.8.1.
   #
-  def each_line(*args, **kw, &block) # :yield: line
-    IO.foreach(@path, *args, **kw, &block)
+  def each_line(...) # :yield: line
+    IO.foreach(@path, ...)
   end
 
   # See <tt>IO.read</tt>.  Returns all data from the file, or the first +N+ bytes
   # if specified.
-  def read(*args, **kw) IO.read(@path, *args, **kw) end
+  def read(...) IO.read(@path, ...) end
 
   # See <tt>IO.binread</tt>.  Returns all the bytes from the file, or the first +N+
   # if specified.
   def binread(*args) IO.binread(@path, *args) end
 
   # See <tt>IO.write</tt>.  Returns the number of bytes written to the file.
-  def write(*args, **kw) IO.write(@path, *args, **kw) end
+  def write(...) IO.write(@path, ...) end
 
   # See <tt>IO.binwrite</tt>.  Returns the number of bytes written to the file.
   def binwrite(*args) IO.binwrite(@path, *args) end
 
   # See <tt>IO.readlines</tt>.  Returns all the lines from the file.
-  def readlines(*args, **kw) IO.readlines(@path, *args, **kw) end
+  def readlines(...) IO.readlines(@path, ...) end
 
   # See <tt>IO.sysopen</tt>.
   def sysopen(*args) IO.sysopen(@path, *args) end
@@ -870,8 +870,8 @@ def ftype() File.ftype(@path) end
   def make_link(old) File.link(old, @path) end
 
   # See <tt>File.open</tt>.  Opens the file for reading or writing.
-  def open(*args, **kw, &block) # :yield: file
-    File.open(@path, *args, **kw, &block)
+  def open(...) # :yield: file
+    File.open(@path, ...)
   end
 
   # See <tt>File.readlink</tt>.  Read symbolic link.
diff --git a/spec/ruby/core/file/new_spec.rb b/spec/ruby/core/file/new_spec.rb
index 878c3b6df975..a1ca46979ed8 100644
--- a/spec/ruby/core/file/new_spec.rb
+++ b/spec/ruby/core/file/new_spec.rb
@@ -83,6 +83,7 @@
 
     -> { @fh.puts("test") }.should raise_error(IOError)
     @fh.read.should == ""
+    File.should.exist?(@file)
   end
 
   it "returns a new read-only File when mode is not specified but flags option is present" do
@@ -90,6 +91,7 @@
 
     -> { @fh.puts("test") }.should raise_error(IOError)
     @fh.read.should == ""
+    File.should.exist?(@file)
   end
 
   it "creates a new file when use File::EXCL mode" do
@@ -132,6 +134,26 @@
     File.should.exist?(@file)
   end
 
+  it "returns a new read-only File when use File::RDONLY|File::CREAT mode" do
+    @fh = File.new(@file, File::RDONLY|File::CREAT)
+    @fh.should be_kind_of(File)
+    File.should.exist?(@file)
+
+    # it's read-only
+    -> { @fh.puts("test") }.should raise_error(IOError)
+    @fh.read.should == ""
+  end
+
+  it "returns a new read-only File when use File::CREAT mode" do
+    @fh = File.new(@file, File::CREAT)
+    @fh.should be_kind_of(File)
+    File.should.exist?(@file)
+
+    # it's read-only
+    -> { @fh.puts("test") }.should raise_error(IOError)
+    @fh.read.should == ""
+  end
+
   it "coerces filename using to_str" do
     name = mock("file")
     name.should_receive(:to_str).and_return(@file)
@@ -146,13 +168,16 @@
     File.should.exist?(@file)
   end
 
-  it "accepts options as a keyword argument" do
-    @fh = File.new(@file, 'w', 0755, flags: @flags)
-    @fh.should be_kind_of(File)
+  ruby_version_is "3.0" do
+    it "accepts options as a keyword argument" do
+      @fh = File.new(@file, 'w', 0755, flags: @flags)
+      @fh.should be_kind_of(File)
+      @fh.close
 
-    -> {
-      @fh = File.new(@file, 'w', 0755, {flags: @flags})
-    }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+      -> {
+        @fh = File.new(@file, 'w', 0755, {flags: @flags})
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+    end
   end
 
   it "bitwise-ORs mode and flags option" do
diff --git a/spec/ruby/core/file/open_spec.rb b/spec/ruby/core/file/open_spec.rb
index 0346224b93fc..0c6d6cd19c32 100644
--- a/spec/ruby/core/file/open_spec.rb
+++ b/spec/ruby/core/file/open_spec.rb
@@ -565,13 +565,15 @@
     File.open(@file, 'wb+') {|f| f.external_encoding.should == Encoding::BINARY}
   end
 
-  it "accepts options as a keyword argument" do
-    @fh = File.open(@file, 'w', 0755, flags: File::CREAT)
-    @fh.should be_an_instance_of(File)
+  ruby_version_is "3.0" do
+    it "accepts options as a keyword argument" do
+      @fh = File.open(@file, 'w', 0755, flags: File::CREAT)
+      @fh.should be_an_instance_of(File)
 
-    -> {
-      File.open(@file, 'w', 0755, {flags: File::CREAT})
-    }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+      -> {
+        File.open(@file, 'w', 0755, {flags: File::CREAT})
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+    end
   end
 
   it "uses the second argument as an options Hash" do
diff --git a/spec/ruby/core/io/initialize_spec.rb b/spec/ruby/core/io/initialize_spec.rb
index 026252a13d16..28fd7af7ab43 100644
--- a/spec/ruby/core/io/initialize_spec.rb
+++ b/spec/ruby/core/io/initialize_spec.rb
@@ -27,15 +27,17 @@
     @io.fileno.should == fd
   end
 
-  it "accepts options as keyword arguments" do
-    fd = new_fd @name, "w:utf-8"
+  ruby_version_is "3.0" do
+    it "accepts options as keyword arguments" do
+      fd = new_fd @name, "w:utf-8"
 
-    @io.send(:initialize, fd, "w", flags: File::CREAT)
-    @io.fileno.should == fd
+      @io.send(:initialize, fd, "w", flags: File::CREAT)
+      @io.fileno.should == fd
 
-    -> {
-      @io.send(:initialize, fd, "w", {flags: File::CREAT})
-    }.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 1..2)")
+      -> {
+        @io.send(:initialize, fd, "w", {flags: File::CREAT})
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 1..2)")
+    end
   end
 
   it "raises a TypeError when passed an IO" do
diff --git a/spec/ruby/core/io/read_spec.rb b/spec/ruby/core/io/read_spec.rb
index c5a370f10524..4294988351bc 100644
--- a/spec/ruby/core/io/read_spec.rb
+++ b/spec/ruby/core/io/read_spec.rb
@@ -23,12 +23,15 @@
     IO.read(p)
   end
 
-  it "accepts options as keyword arguments" do
-    IO.read(@fname, 3, 0, mode: "r+").should == @contents[0, 3]
+  ruby_version_is "3.0" do
+    # https://bugs.ruby-lang.org/issues/19354
+    it "accepts options as keyword arguments" do
+      IO.read(@fname, 3, 0, mode: "r+").should == @contents[0, 3]
 
-    -> {
-      IO.read(@fname, 3, 0, {mode: "r+"})
-    }.should raise_error(ArgumentError, /wrong number of arguments/)
+      -> {
+        IO.read(@fname, 3, 0, {mode: "r+"})
+      }.should raise_error(ArgumentError, /wrong number of arguments/)
+    end
   end
 
   it "accepts an empty options Hash" do
diff --git a/spec/ruby/core/io/shared/new.rb b/spec/ruby/core/io/shared/new.rb
index 6780c236cba0..da4c0af7a979 100644
--- a/spec/ruby/core/io/shared/new.rb
+++ b/spec/ruby/core/io/shared/new.rb
@@ -64,13 +64,15 @@
     @io.should be_an_instance_of(IO)
   end
 
-  it "accepts options as keyword arguments" do
-    @io = IO.send(@method, @fd, "w", flags: File::CREAT)
-    @io.write("foo").should == 3
+  ruby_version_is "3.0" do
+    it "accepts options as keyword arguments" do
+      @io = IO.send(@method, @fd, "w", flags: File::CREAT)
+      @io.write("foo").should == 3
 
-    -> {
-      IO.send(@method, @fd, "w", {flags: File::CREAT})
-    }.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 1..2)")
+      -> {
+        IO.send(@method, @fd, "w", {flags: File::CREAT})
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 1..2)")
+    end
   end
 
   it "accepts a :mode option" do
diff --git a/spec/ruby/core/kernel/open_spec.rb b/spec/ruby/core/kernel/open_spec.rb
index 8a02fc56debc..bad2ae9d2cd7 100644
--- a/spec/ruby/core/kernel/open_spec.rb
+++ b/spec/ruby/core/kernel/open_spec.rb
@@ -72,13 +72,15 @@
     -> { open }.should raise_error(ArgumentError)
   end
 
-  it "accepts options as keyword arguments" do
-    @file = open(@name, "r", 0666, flags: File::CREAT)
-    @file.should be_kind_of(File)
+  ruby_version_is "3.0" do
+    it "accepts options as keyword arguments" do
+      @file = open(@name, "r", 0666, flags: File::CREAT)
+      @file.should be_kind_of(File)
 
-    -> {
-      open(@name, "r", 0666, {flags: File::CREAT})
-    }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+      -> {
+        open(@name, "r", 0666, {flags: File::CREAT})
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 4, expected 1..3)")
+    end
   end
 
   describe "when given an object that responds to to_open" do