diff --git a/NEWS.md b/NEWS.md
index 3468f479596293..24a36475360569 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -213,7 +213,7 @@ The following bundled gems are promoted from default gems.
 * pstore 0.2.0
 * benchmark 0.5.0
 * logger 1.7.0
-* rdoc 6.16.1
+* rdoc 6.17.0
 * win32ole 1.9.2
 * irb 1.15.3
 * reline 0.6.3
diff --git a/gc.c b/gc.c
index c660d1491f3a6d..5e3e44e726704d 100644
--- a/gc.c
+++ b/gc.c
@@ -4841,11 +4841,11 @@ rb_raw_obj_info_buitin_type(char *const buff, const size_t buff_size, const VALU
                         APPEND_F("(too_complex) len:%zu", hash_len);
                     }
                     else {
-                        APPEND_F("(embed) len:%d", ROBJECT_FIELDS_CAPACITY(obj));
+                        APPEND_F("(embed) len:%d capa:%d", RSHAPE_LEN(RBASIC_SHAPE_ID(obj)), ROBJECT_FIELDS_CAPACITY(obj));
                     }
                 }
                 else {
-                    APPEND_F("len:%d ptr:%p", ROBJECT_FIELDS_CAPACITY(obj), (void *)ROBJECT_FIELDS(obj));
+                    APPEND_F("len:%d capa:%d ptr:%p", RSHAPE_LEN(RBASIC_SHAPE_ID(obj)), ROBJECT_FIELDS_CAPACITY(obj), (void *)ROBJECT_FIELDS(obj));
                 }
             }
             break;
diff --git a/gems/bundled_gems b/gems/bundled_gems
index 180e1dffcd4dae..bdda3311d0eb07 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -39,7 +39,7 @@ ostruct             0.6.3   https://github.com/ruby/ostruct
 pstore              0.2.0   https://github.com/ruby/pstore
 benchmark           0.5.0   https://github.com/ruby/benchmark
 logger              1.7.0   https://github.com/ruby/logger
-rdoc                6.16.1  https://github.com/ruby/rdoc
+rdoc                6.17.0  https://github.com/ruby/rdoc
 win32ole            1.9.2   https://github.com/ruby/win32ole
 irb                 1.15.3  https://github.com/ruby/irb
 reline              0.6.3   https://github.com/ruby/reline
diff --git a/pathname_builtin.rb b/pathname_builtin.rb
index 3d78619c9e4041..878603d4d69cd0 100644
--- a/pathname_builtin.rb
+++ b/pathname_builtin.rb
@@ -195,14 +195,12 @@ class Pathname
 
   # :stopdoc:
 
-  SAME_PATHS = if File::FNM_SYSCASE.nonzero?
+  if File::FNM_SYSCASE.nonzero?
     # Avoid #zero? here because #casecmp can return nil.
-    proc {|a, b| a.casecmp(b) == 0}
+    private def same_paths?(a, b) a.casecmp(b) == 0 end
   else
-    proc {|a, b| a == b}
+    private def same_paths?(a, b) a == b end
   end
-  SAME_PATHS.freeze
-  private_constant :SAME_PATHS
 
   attr_reader :path
   protected :path
@@ -215,8 +213,13 @@ class Pathname
   #
   def initialize(path)
     @path = File.path(path).dup
+  rescue TypeError => e
+    raise e.class, "Pathname.new requires a String, #to_path or #to_str", cause: nil
   end
 
+  #
+  # Freze self.
+  #
   def freeze
     super
     @path.freeze
@@ -836,12 +839,12 @@ def relative_path_from(base_directory)
       base_prefix, basename = r
       base_names.unshift basename if basename != '.'
     end
-    unless SAME_PATHS[dest_prefix, base_prefix]
+    unless same_paths?(dest_prefix, base_prefix)
       raise ArgumentError, "different prefix: #{dest_prefix.inspect} and #{base_directory.inspect}"
     end
     while !dest_names.empty? &&
           !base_names.empty? &&
-          SAME_PATHS[dest_names.first, base_names.first]
+          same_paths?(dest_names.first, base_names.first)
       dest_names.shift
       base_names.shift
     end
diff --git a/prism/srcs.mk b/prism/srcs.mk
index 167aa4dbe07e89..022662a00b5f30 100644
--- a/prism/srcs.mk
+++ b/prism/srcs.mk
@@ -14,7 +14,7 @@ prism/$(HAVE_BASERUBY:yes=.srcs.mk.time): \
 
 distclean-prism-srcs::
 	$(RM) prism/.srcs.mk.time
-	$(RMDIR) prism
+	$(RMDIRS) prism || $(NULLCMD)
 
 distclean-srcs-local:: distclean-prism-srcs
 
diff --git a/prism/srcs.mk.in b/prism/srcs.mk.in
index b67ce993709ac3..cc263fd1b4ef3f 100644
--- a/prism/srcs.mk.in
+++ b/prism/srcs.mk.in
@@ -22,7 +22,7 @@ prism/$(HAVE_BASERUBY:yes=.srcs.mk.time): \
 
 distclean-prism-srcs::
 	$(RM) prism/.srcs.mk.time
-	$(RMDIR) prism
+	$(RMDIRS) prism || $(NULLCMD)
 
 distclean-srcs-local:: distclean-prism-srcs
 
diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index e2d6a09fb2f0c0..3114d1458d229d 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -485,6 +485,13 @@ def test_initialize
     p2 = Pathname.new(p1)
     assert_equal(p1, p2)
 
+    obj = Object.new
+    assert_raise_with_message(TypeError, /#to_path or #to_str/) { Pathname.new(obj) }
+
+    obj = Object.new
+    def obj.to_path; "a/path"; end
+    assert_equal("a/path", Pathname.new(obj).to_s)
+
     obj = Object.new
     def obj.to_str; "a/b"; end
     assert_equal("a/b", Pathname.new(obj).to_s)
@@ -494,6 +501,10 @@ def test_initialize_nul
     assert_raise(ArgumentError) { Pathname.new("a\0") }
   end
 
+  def test_initialize_encoding
+    assert_raise(Encoding::CompatibilityError) { Pathname.new("a".encode(Encoding::UTF_32BE)) }
+  end
+
   def test_global_constructor
     p = Pathname.new('a')
     assert_equal(p, Pathname('a'))
diff --git a/test/pathname/test_ractor.rb b/test/pathname/test_ractor.rb
index f06b7501f3448b..737e4a4111d65c 100644
--- a/test/pathname/test_ractor.rb
+++ b/test/pathname/test_ractor.rb
@@ -20,6 +20,11 @@ class Ractor
         x.join(Pathname("b"), Pathname("c"))
       end
       assert_equal(Pathname("a/b/c"), r.value)
+
+      r = Ractor.new Pathname("a") do |a|
+        Pathname("b").relative_path_from(a)
+      end
+      assert_equal(Pathname("../b"), r.value)
     end;
   end
 end