diff --git a/array.c b/array.c
index 8becdbbc91..5824345cc9 100644
--- a/array.c
+++ b/array.c
@@ -3469,8 +3469,8 @@ rb_ary_bsearch_index(VALUE ary)
 	    const VALUE zero = INT2FIX(0);
 	    switch (rb_cmpint(rb_funcallv(v, id_cmp, 1, &zero), v, zero)) {
 	      case 0: return INT2FIX(mid);
-	      case 1: smaller = 1; break;
-	      case -1: smaller = 0;
+	      case 1: smaller = 0; break;
+	      case -1: smaller = 1;
 	    }
 	}
 	else {
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index ccbe85877f..0ed8ada95c 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -3218,6 +3218,8 @@ class TestArray < Test::Unit::TestCase
     assert_equal(nil, a.bsearch {|x|   1  * (2**100) })
     assert_equal(nil, a.bsearch {|x| (-1) * (2**100) })
 
+    assert_equal(4, a.bsearch {|x| (4 - x).to_r })
+
     assert_include([4, 7], a.bsearch {|x| (2**100).coerce((1 - x / 4) * (2**100)).first })
   end
 
@@ -3253,6 +3255,8 @@ class TestArray < Test::Unit::TestCase
     assert_equal(nil, a.bsearch_index {|x|   1  * (2**100) })
     assert_equal(nil, a.bsearch_index {|x| (-1) * (2**100) })
 
+    assert_equal(1, a.bsearch_index {|x| (4 - x).to_r })
+
     assert_include([1, 2], a.bsearch_index {|x| (2**100).coerce((1 - x / 4) * (2**100)).first })
   end
 
diff --git a/version.h b/version.h
index c6c40fc9dd..052d9bcae7 100644
--- a/version.h
+++ b/version.h
@@ -11,11 +11,11 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 239
+#define RUBY_PATCHLEVEL 240
 
 #define RUBY_RELEASE_YEAR 2023
-#define RUBY_RELEASE_MONTH 9
-#define RUBY_RELEASE_DAY 19
+#define RUBY_RELEASE_MONTH 10
+#define RUBY_RELEASE_DAY 10
 
 #include "ruby/version.h"