diff --git a/.travis.yml b/.travis.yml
index 9f3c119fd..a134d2052 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,14 +11,14 @@ matrix:
     - name: 2.3.8 / Parser tests
       rvm: 2.3.8
       script: bundle exec rake test_cov
-    - name: 2.4.6 / Parser tests
-      rvm: 2.4.6
+    - name: 2.4.7 / Parser tests
+      rvm: 2.4.7
       script: bundle exec rake test_cov
-    - name: 2.5.5 / Parser tests
-      rvm: 2.5.5
+    - name: 2.5.6 / Parser tests
+      rvm: 2.5.6
       script: bundle exec rake test_cov
-    - name: 2.6.3 / Parser tests
-      rvm: 2.6.3
+    - name: 2.6.4 / Parser tests
+      rvm: 2.6.4
       script: bundle exec rake test_cov
     - name: ruby-head / Parser tests
       rvm: ruby-head
@@ -29,11 +29,11 @@ matrix:
     - name: rbx-2 / Parser tests
       rvm: rbx-2
       script: bundle exec rake test_cov
-    - name: 2.5.5 / Rubocop tests
-      rvm: 2.5.5
+    - name: 2.5.6 / Rubocop tests
+      rvm: 2.5.6
       script: ./ci/run_rubocop_specs
-    - name: 2.6.3 / Rubocop tests
-      rvm: 2.6.3
+    - name: 2.6.4 / Rubocop tests
+      rvm: 2.6.4
       script: ./ci/run_rubocop_specs
   allow_failures:
     - rvm: ruby-head
diff --git a/lib/parser/current.rb b/lib/parser/current.rb
index 4eb62bbef..8927a6fe5 100644
--- a/lib/parser/current.rb
+++ b/lib/parser/current.rb
@@ -48,7 +48,7 @@ def warn_syntax_deviation(feature, version)
     CurrentRuby = Ruby23
 
   when /^2\.4\./
-    current_version = '2.4.6'
+    current_version = '2.4.7'
     if RUBY_VERSION != current_version
       warn_syntax_deviation 'parser/ruby24', current_version
     end
@@ -57,7 +57,7 @@ def warn_syntax_deviation(feature, version)
     CurrentRuby = Ruby24
 
   when /^2\.5\./
-    current_version = '2.5.5'
+    current_version = '2.5.6'
     if RUBY_VERSION != current_version
       warn_syntax_deviation 'parser/ruby25', current_version
     end
@@ -66,7 +66,7 @@ def warn_syntax_deviation(feature, version)
     CurrentRuby = Ruby25
 
   when /^2\.6\./
-    current_version = '2.6.3'
+    current_version = '2.6.4'
     if RUBY_VERSION != current_version
       warn_syntax_deviation 'parser/ruby26', current_version
     end
diff --git a/lib/parser/ruby25.y b/lib/parser/ruby25.y
index 4d9613780..62bb6a308 100644
--- a/lib/parser/ruby25.y
+++ b/lib/parser/ruby25.y
@@ -1885,7 +1885,7 @@ regexp_contents: # nothing
                       result = @builder.symbol(val[0])
                     }
 
-            dsym: tSYMBEG xstring_contents tSTRING_END
+            dsym: tSYMBEG string_contents tSTRING_END
                     {
                       @lexer.state = :expr_end
                       result = @builder.symbol_compose(val[0], val[1], val[2])