diff --git a/ChangeLog b/ChangeLog
index b8d9059447..e6c546a01e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Mar 29 17:03:28 2016  Rei Odaira  <Rei.Odaira@gmail.com>
+
+	* test/-ext-/float/test_nextafter.rb: In AIX,
+	  nextafter(+0.0,-0.0)=+0.0, and nextafter(-0.0,+0.0)=-0.0,
+	  but they should return -0.0 and +0.0, respectively. This is
+	  a known bug in nextafter(3) on AIX, so skip related tests.
+
 Tue Mar 29 16:54:14 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (enc_succ_alnum_char): try to skip an invalid character
diff --git a/test/-ext-/float/test_nextafter.rb b/test/-ext-/float/test_nextafter.rb
index c131d1e413..636f803fac 100644
--- a/test/-ext-/float/test_nextafter.rb
+++ b/test/-ext-/float/test_nextafter.rb
@@ -46,9 +46,16 @@ class TestFloatExt < Test::Unit::TestCase
           if v1 == 0
             s1 = 1.0/v1 < 0 ? "negative-zero" : "positive-zero"
             s2 = 1.0/v2 < 0 ? "negative-zero" : "positive-zero"
-            assert_equal(s1, s2,
-            "Bug::Float.missing_nextafter(#{'%a' % n1}, #{'%a' % n2}) = #{'%a' % v1} != " +
-            "#{'%a' % v2} = Bug::Float.system_nextafter(#{'%a' % n1}, #{'%a' % n2})")
+            begin
+              assert_equal(s1, s2,
+              "Bug::Float.missing_nextafter(#{'%a' % n1}, #{'%a' % n2}) = #{'%a' % v1} != " +
+              "#{'%a' % v2} = Bug::Float.system_nextafter(#{'%a' % n1}, #{'%a' % n2})")
+            rescue Minitest::Assertion
+              if /aix/ =~ RUBY_PLATFORM
+                skip "Known bug in nextafter(3) on AIX"
+              end
+              raise $!
+            end
           end
         end
       }
diff --git a/version.h b/version.h
index f0f33594ac..96dd8ff8ca 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.3.0"
 #define RUBY_RELEASE_DATE "2016-03-29"
-#define RUBY_PATCHLEVEL 41
+#define RUBY_PATCHLEVEL 42
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 3