11 files changed, 11 insertions, 11 deletions
diff --git a/ext/date/date.gemspec b/ext/date/date.gemspec
index f5649f8daa..a5accd29e6 100644
--- a/ext/date/date.gemspec
+++ b/ext/date/date.gemspec
@@ -17,5 +17,5 @@ Gem::Specification.new do |s|
   s.authors = ["Tadayoshi Funaba"]
   s.email = [nil]
   s.homepage = "https://github.com/ruby/date"
-  s.license = "BSD-2-Clause"
+  s.licenses = ["Ruby", "BSD-2-Clause"]
 end
diff --git a/ext/dbm/dbm.gemspec b/ext/dbm/dbm.gemspec
index 02d4990ecb..0ff036f712 100644
--- a/ext/dbm/dbm.gemspec
+++ b/ext/dbm/dbm.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.authors = ["Yukihiro Matsumoto"]
   s.email = ["matz@ruby-lang.org"]
   s.homepage = "https://github.com/ruby/dbm"
-  s.license = "BSD-2-Clause"
+  s.licenses = ["Ruby", "BSD-2-Clause"]
 
   s.add_development_dependency "rake-compiler"
   s.add_development_dependency "test-unit"
diff --git a/ext/etc/etc.gemspec b/ext/etc/etc.gemspec
index 1b39a6d59a..7d687e3b99 100644
--- a/ext/etc/etc.gemspec
+++ b/ext/etc/etc.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.summary       = %q{Provides access to information typically stored in UNIX /etc directory.}
   spec.description   = spec.summary
   spec.homepage      = "https://github.com/ruby/etc"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
   spec.files         = %w[
     LICENSE.txt
diff --git a/ext/fcntl/fcntl.gemspec b/ext/fcntl/fcntl.gemspec
index c27a03d47a..645c507a4d 100644
--- a/ext/fcntl/fcntl.gemspec
+++ b/ext/fcntl/fcntl.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.summary       = "Loads constants defined in the OS fcntl.h C header file"
   spec.description   = "Loads constants defined in the OS fcntl.h C header file"
   spec.homepage      = "https://github.com/ruby/fcntl"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
   spec.files         = ["ext/fcntl/extconf.rb", "ext/fcntl/fcntl.c"]
   spec.bindir        = "exe"
diff --git a/ext/fiddle/fiddle.gemspec b/ext/fiddle/fiddle.gemspec
index da57ea7dc7..a92955ccec 100644
--- a/ext/fiddle/fiddle.gemspec
+++ b/ext/fiddle/fiddle.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.summary       = %q{A libffi wrapper for Ruby.}
   spec.description   = %q{A libffi wrapper for Ruby.}
   spec.homepage      = "https://github.com/ruby/fiddle"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
   spec.files         = [
     "LICENSE.txt",
diff --git a/ext/gdbm/gdbm.gemspec b/ext/gdbm/gdbm.gemspec
index da074b0180..3ecb3121fe 100644
--- a/ext/gdbm/gdbm.gemspec
+++ b/ext/gdbm/gdbm.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.summary       = "Ruby extension for GNU dbm."
   spec.description   = "Ruby extension for GNU dbm."
   spec.homepage      = "https://github.com/ruby/gdbm"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
   spec.files         = ["ext/gdbm/extconf.rb", "ext/gdbm/gdbm.c"]
   spec.bindir        = "exe"
diff --git a/ext/io/console/io-console.gemspec b/ext/io/console/io-console.gemspec
index 297c994de9..743e5e965d 100644
--- a/ext/io/console/io-console.gemspec
+++ b/ext/io/console/io-console.gemspec
@@ -21,5 +21,5 @@ Gem::Specification.new do |s|
     lib/io/console/size.rb
   ]
   s.extensions = %w[ext/io/console/extconf.rb]
-  s.license = "BSD-2-Clause"
+  s.licenses = ["Ruby", "BSD-2-Clause"]
 end
diff --git a/ext/readline/readline-ext.gemspec b/ext/readline/readline-ext.gemspec
index b85e07dd93..66db14d14a 100644
--- a/ext/readline/readline-ext.gemspec
+++ b/ext/readline/readline-ext.gemspec
@@ -7,7 +7,7 @@ Gem::Specification.new do |spec|
   spec.summary       = %q{Provides an interface for GNU Readline and Edit Line (libedit).}
   spec.description   = %q{Provides an interface for GNU Readline and Edit Line (libedit).}
   spec.homepage      = "https://github.com/ruby/readline-ext"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses      = ["Ruby", "BSD-2-Clause"]
   spec.extensions    = %w[ext/readline/extconf.rb]
 
   spec.metadata["homepage_uri"] = spec.homepage
diff --git a/ext/stringio/stringio.gemspec b/ext/stringio/stringio.gemspec
index 4849481786..c765242f35 100644
--- a/ext/stringio/stringio.gemspec
+++ b/ext/stringio/stringio.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.extensions = ["ext/stringio/extconf.rb"]
   s.files = ["README.md", "ext/stringio/extconf.rb", "ext/stringio/stringio.c"]
   s.homepage = "https://github.com/ruby/stringio"
-  s.licenses = ["BSD-2-Clause"]
+  s.licenses = ["Ruby", "BSD-2-Clause"]
   s.required_ruby_version = ">= 2.5"
   s.summary = "Pseudo IO on String"
 
diff --git a/ext/strscan/strscan.gemspec b/ext/strscan/strscan.gemspec
index 4759c6c860..1228e80804 100644
--- a/ext/strscan/strscan.gemspec
+++ b/ext/strscan/strscan.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.authors = ["Minero Aoki", "Sutou Kouhei"]
   s.email = [nil, "kou@cozmixng.org"]
   s.homepage = "https://github.com/ruby/strscan"
-  s.license = "BSD-2-Clause"
+  s.licenses = ["Ruby", "BSD-2-Clause"]
 
   s.add_development_dependency "rake-compiler"
   s.add_development_dependency "benchmark-driver"
diff --git a/ext/zlib/zlib.gemspec b/ext/zlib/zlib.gemspec
index 4a77ae325e..ae1f24143d 100644
--- a/ext/zlib/zlib.gemspec
+++ b/ext/zlib/zlib.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.summary       = %q{Ruby interface for the zlib compression/decompression library}
   spec.description   = %q{Ruby interface for the zlib compression/decompression library}
   spec.homepage      = "https://github.com/ruby/zlib"
-  spec.license       = "BSD-2-Clause"
+  spec.licenses       = ["Ruby", "BSD-2-Clause"]
 
   spec.files         = [".gitignore", ".travis.yml", "Gemfile", "LICENSE.txt", "README.md", "Rakefile", "bin/console", "bin/setup", "ext/zlib/extconf.rb", "ext/zlib/zlib.c", "zlib.gemspec"]
   spec.bindir        = "exe"