From 54606b8f72af116fb10c834b5ade620173c9f1b5 Mon Sep 17 00:00:00 2001
From: Earlopain <14981592+Earlopain@users.noreply.github.com>
Date: Fri, 7 Nov 2025 12:55:05 +0100
Subject: [PATCH 1/2] Reverse-sync
 https://github.com/ruby/ruby/commit/f4e01783d3412b10f9978b5297142979cb067ce8

---
 include/prism/options.h   |  5 ++++-
 lib/prism/ffi.rb          |  2 ++
 src/options.c             | 10 ++++++++++
 test/prism/test_helper.rb |  2 +-
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/include/prism/options.h b/include/prism/options.h
index 1a92c470f1..44cd745e15 100644
--- a/include/prism/options.h
+++ b/include/prism/options.h
@@ -94,8 +94,11 @@ typedef enum {
     /** The vendored version of prism in CRuby 3.5.x. */
     PM_OPTIONS_VERSION_CRUBY_3_5 = 3,
 
+    /** The vendored version of prism in CRuby 4.0.x. */
+    PM_OPTIONS_VERSION_CRUBY_4_0 = 4,
+
     /** The current version of prism. */
-    PM_OPTIONS_VERSION_LATEST = PM_OPTIONS_VERSION_CRUBY_3_5
+    PM_OPTIONS_VERSION_LATEST = PM_OPTIONS_VERSION_CRUBY_4_0
 } pm_options_version_t;
 
 /**
diff --git a/lib/prism/ffi.rb b/lib/prism/ffi.rb
index a3bf5786bd..f6ad6f98b1 100644
--- a/lib/prism/ffi.rb
+++ b/lib/prism/ffi.rb
@@ -434,6 +434,8 @@ def dump_options_version(version)
         2
       when /\A3\.5(\.\d+)?\z/
         3
+      when /\A4\.0(\.\d+)?\z/
+        4
       else
         if current
           raise CurrentVersionError, RUBY_VERSION
diff --git a/src/options.c b/src/options.c
index 1b5c022cf5..373d76a21f 100644
--- a/src/options.c
+++ b/src/options.c
@@ -93,6 +93,11 @@ pm_options_version_set(pm_options_t *options, const char *version, size_t length
             return true;
         }
 
+        if (strncmp(version, "4.0", 3) == 0) {
+            options->version = PM_OPTIONS_VERSION_CRUBY_4_0;
+            return true;
+        }
+
         return false;
     }
 
@@ -111,6 +116,11 @@ pm_options_version_set(pm_options_t *options, const char *version, size_t length
             options->version = PM_OPTIONS_VERSION_CRUBY_3_5;
             return true;
         }
+
+        if (strncmp(version, "4.0.", 4) == 0 && is_number(version + 4, length - 4)) {
+            options->version = PM_OPTIONS_VERSION_CRUBY_4_0;
+            return true;
+        }
     }
 
     if (length >= 6) {
diff --git a/test/prism/test_helper.rb b/test/prism/test_helper.rb
index 84871722c9..faf6117668 100644
--- a/test/prism/test_helper.rb
+++ b/test/prism/test_helper.rb
@@ -230,7 +230,7 @@ def self.windows?
     end
 
     # All versions that prism can parse
-    SYNTAX_VERSIONS = %w[3.3 3.4 3.5]
+    SYNTAX_VERSIONS = %w[3.3 3.4 3.5 4.0]
 
     # Returns an array of ruby versions that a given filepath should test against:
     # test.txt         # => all available versions

From d0a823f0455b7e0ef18f0beea9bfece91732db8b Mon Sep 17 00:00:00 2001
From: Earlopain <14981592+Earlopain@users.noreply.github.com>
Date: Fri, 7 Nov 2025 13:14:07 +0100
Subject: [PATCH 2/2] Rename Ruby 3.5 to Ruby 4.0

See https://github.com/ruby/ruby/commit/6d81969b475262aba251e99b518181bdf7c5a523

It leaves the old variant around. RuboCop for examples accesses `Prism::Translation::Parser35`
to test against ruby-head. For now I left these simply as an alias
---
 include/prism/options.h                       |  4 ++--
 java/org/prism/ParsingOptions.java            |  3 ++-
 javascript/src/parsePrism.js                  |  2 +-
 lib/prism/ffi.rb                              |  4 +---
 lib/prism/translation.rb                      |  1 +
 lib/prism/translation/parser.rb               |  6 +++---
 lib/prism/translation/parser35.rb             |  7 +------
 lib/prism/translation/parser40.rb             | 13 ++++++++++++
 lib/prism/translation/parser_current.rb       |  4 ++--
 prism.gemspec                                 |  2 ++
 rbi/prism/translation/parser35.rbi            |  2 --
 rbi/prism/translation/parser40.rbi            |  6 ++++++
 .../endless_methods_command_call.txt          |  0
 snapshots/{3.5 => 4.0}/leading_logical.txt    |  0
 src/options.c                                 | 20 +++++--------------
 src/prism.c                                   |  8 ++++----
 test/prism/api/parse_test.rb                  |  3 +++
 .../endless_methods_command_call.txt          |  0
 .../fixtures/{3.5 => 4.0}/leading_logical.txt |  0
 test/prism/fixtures_test.rb                   |  4 ++--
 test/prism/lex_test.rb                        |  4 ++--
 test/prism/locals_test.rb                     |  4 ++--
 test/prism/ractor_test.rb                     |  2 +-
 test/prism/ruby/parser_test.rb                |  7 ++++---
 test/prism/ruby/ripper_test.rb                |  4 ++--
 test/prism/ruby/ruby_parser_test.rb           |  4 ++--
 test/prism/test_helper.rb                     |  3 ++-
 27 files changed, 63 insertions(+), 54 deletions(-)
 create mode 100644 lib/prism/translation/parser40.rb
 create mode 100644 rbi/prism/translation/parser40.rbi
 rename snapshots/{3.5 => 4.0}/endless_methods_command_call.txt (100%)
 rename snapshots/{3.5 => 4.0}/leading_logical.txt (100%)
 rename test/prism/fixtures/{3.5 => 4.0}/endless_methods_command_call.txt (100%)
 rename test/prism/fixtures/{3.5 => 4.0}/leading_logical.txt (100%)

diff --git a/include/prism/options.h b/include/prism/options.h
index 44cd745e15..a663c9767e 100644
--- a/include/prism/options.h
+++ b/include/prism/options.h
@@ -91,11 +91,11 @@ typedef enum {
     /** The vendored version of prism in CRuby 3.4.x. */
     PM_OPTIONS_VERSION_CRUBY_3_4 = 2,
 
-    /** The vendored version of prism in CRuby 3.5.x. */
+    /** The vendored version of prism in CRuby 4.0.x. */
     PM_OPTIONS_VERSION_CRUBY_3_5 = 3,
 
     /** The vendored version of prism in CRuby 4.0.x. */
-    PM_OPTIONS_VERSION_CRUBY_4_0 = 4,
+    PM_OPTIONS_VERSION_CRUBY_4_0 = 3,
 
     /** The current version of prism. */
     PM_OPTIONS_VERSION_LATEST = PM_OPTIONS_VERSION_CRUBY_4_0
diff --git a/java/org/prism/ParsingOptions.java b/java/org/prism/ParsingOptions.java
index 4aff7dbe35..6f7a342818 100644
--- a/java/org/prism/ParsingOptions.java
+++ b/java/org/prism/ParsingOptions.java
@@ -15,7 +15,8 @@ public enum SyntaxVersion {
         LATEST(0), // Handled in pm_parser_init
         V3_3(1),
         V3_4(2),
-        V3_5(3);
+        V3_5(3),
+        V4_0(3);
 
         private final int value;
 
diff --git a/javascript/src/parsePrism.js b/javascript/src/parsePrism.js
index d021c63a9b..a2f0370993 100644
--- a/javascript/src/parsePrism.js
+++ b/javascript/src/parsePrism.js
@@ -146,7 +146,7 @@ function dumpOptions(options) {
     values.push(1);
   } else if (options.version.match(/^3\.4(\.\d+)?$/)) {
     values.push(2);
-  } else if (options.version.match(/^3\.5(\.\d+)?$/)) {
+  } else if (options.version.match(/^3\.5(\.\d+)?$/) || options.version.match(/^4\.0(\.\d+)?$/)) {
     values.push(3);
   } else {
     throw new Error(`Unsupported version '${options.version}' in compiler options`);
diff --git a/lib/prism/ffi.rb b/lib/prism/ffi.rb
index f6ad6f98b1..7e6103fde7 100644
--- a/lib/prism/ffi.rb
+++ b/lib/prism/ffi.rb
@@ -432,10 +432,8 @@ def dump_options_version(version)
         1
       when /\A3\.4(\.\d+)?\z/
         2
-      when /\A3\.5(\.\d+)?\z/
+      when /\A3\.5(\.\d+)?\z/, /\A4\.0(\.\d+)?\z/
         3
-      when /\A4\.0(\.\d+)?\z/
-        4
       else
         if current
           raise CurrentVersionError, RUBY_VERSION
diff --git a/lib/prism/translation.rb b/lib/prism/translation.rb
index d127f2006c..7933b4a722 100644
--- a/lib/prism/translation.rb
+++ b/lib/prism/translation.rb
@@ -10,6 +10,7 @@ module Translation # steep:ignore
     autoload :Parser33, "prism/translation/parser33"
     autoload :Parser34, "prism/translation/parser34"
     autoload :Parser35, "prism/translation/parser35"
+    autoload :Parser40, "prism/translation/parser40"
     autoload :Ripper, "prism/translation/ripper"
     autoload :RubyParser, "prism/translation/ruby_parser"
   end
diff --git a/lib/prism/translation/parser.rb b/lib/prism/translation/parser.rb
index 1ad7a193c4..23245dc383 100644
--- a/lib/prism/translation/parser.rb
+++ b/lib/prism/translation/parser.rb
@@ -84,7 +84,7 @@ def initialize(builder = Prism::Translation::Parser::Builder.new, parser: Prism)
       end
 
       def version # :nodoc:
-        35
+        40
       end
 
       # The default encoding for Ruby files is UTF-8.
@@ -356,8 +356,8 @@ def convert_for_prism(version)
           "3.3.1"
         when 34
           "3.4.0"
-        when 35
-          "3.5.0"
+        when 35, 40
+          "4.0.0"
         else
           "latest"
         end
diff --git a/lib/prism/translation/parser35.rb b/lib/prism/translation/parser35.rb
index 79cd59cbd9..52eeeb6c8c 100644
--- a/lib/prism/translation/parser35.rb
+++ b/lib/prism/translation/parser35.rb
@@ -3,11 +3,6 @@
 
 module Prism
   module Translation
-    # This class is the entry-point for Ruby 3.5 of `Prism::Translation::Parser`.
-    class Parser35 < Parser
-      def version # :nodoc:
-        35
-      end
-    end
+    Parser35 = Parser40 # :nodoc:
   end
 end
diff --git a/lib/prism/translation/parser40.rb b/lib/prism/translation/parser40.rb
new file mode 100644
index 0000000000..2ec7445882
--- /dev/null
+++ b/lib/prism/translation/parser40.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+# :markup: markdown
+
+module Prism
+  module Translation
+    # This class is the entry-point for Ruby 4.0 of `Prism::Translation::Parser`.
+    class Parser40 < Parser
+      def version # :nodoc:
+        40
+      end
+    end
+  end
+end
diff --git a/lib/prism/translation/parser_current.rb b/lib/prism/translation/parser_current.rb
index 1b1794abbe..76d71e9409 100644
--- a/lib/prism/translation/parser_current.rb
+++ b/lib/prism/translation/parser_current.rb
@@ -10,8 +10,8 @@ module Translation
       ParserCurrent = Parser33
     when /^3\.4\./
       ParserCurrent = Parser34
-    when /^3\.5\./
-      ParserCurrent = Parser35
+    when /^3\.5\./, /^4\.0\./
+      ParserCurrent = Parser40
     else
       # Keep this in sync with released Ruby.
       parser = Parser34
diff --git a/prism.gemspec b/prism.gemspec
index 168f8211ff..10c2eaad20 100644
--- a/prism.gemspec
+++ b/prism.gemspec
@@ -101,6 +101,7 @@ Gem::Specification.new do |spec|
     "lib/prism/translation/parser33.rb",
     "lib/prism/translation/parser34.rb",
     "lib/prism/translation/parser35.rb",
+    "lib/prism/translation/parser40.rb",
     "lib/prism/translation/parser/builder.rb",
     "lib/prism/translation/parser/compiler.rb",
     "lib/prism/translation/parser/lexer.rb",
@@ -123,6 +124,7 @@ Gem::Specification.new do |spec|
     "rbi/prism/translation/parser33.rbi",
     "rbi/prism/translation/parser34.rbi",
     "rbi/prism/translation/parser35.rbi",
+    "rbi/prism/translation/parser40.rbi",
     "rbi/prism/translation/ripper.rbi",
     "rbi/prism/visitor.rbi",
     "sig/prism.rbs",
diff --git a/rbi/prism/translation/parser35.rbi b/rbi/prism/translation/parser35.rbi
index 0239fc82ad..68d44e70c6 100644
--- a/rbi/prism/translation/parser35.rbi
+++ b/rbi/prism/translation/parser35.rbi
@@ -1,6 +1,4 @@
 # typed: strict
 
 class Prism::Translation::Parser35 < Prism::Translation::Parser
-  sig { override.returns(Integer) }
-  def version; end
 end
diff --git a/rbi/prism/translation/parser40.rbi b/rbi/prism/translation/parser40.rbi
new file mode 100644
index 0000000000..218682365b
--- /dev/null
+++ b/rbi/prism/translation/parser40.rbi
@@ -0,0 +1,6 @@
+# typed: strict
+
+class Prism::Translation::Parser40 < Prism::Translation::Parser
+  sig { override.returns(Integer) }
+  def version; end
+end
diff --git a/snapshots/3.5/endless_methods_command_call.txt b/snapshots/4.0/endless_methods_command_call.txt
similarity index 100%
rename from snapshots/3.5/endless_methods_command_call.txt
rename to snapshots/4.0/endless_methods_command_call.txt
diff --git a/snapshots/3.5/leading_logical.txt b/snapshots/4.0/leading_logical.txt
similarity index 100%
rename from snapshots/3.5/leading_logical.txt
rename to snapshots/4.0/leading_logical.txt
diff --git a/src/options.c b/src/options.c
index 373d76a21f..4a8953da7d 100644
--- a/src/options.c
+++ b/src/options.c
@@ -88,12 +88,7 @@ pm_options_version_set(pm_options_t *options, const char *version, size_t length
             return true;
         }
 
-        if (strncmp(version, "3.5", 3) == 0) {
-            options->version = PM_OPTIONS_VERSION_CRUBY_3_5;
-            return true;
-        }
-
-        if (strncmp(version, "4.0", 3) == 0) {
+        if (strncmp(version, "3.5", 3) == 0 || strncmp(version, "4.0", 3) == 0) {
             options->version = PM_OPTIONS_VERSION_CRUBY_4_0;
             return true;
         }
@@ -101,23 +96,18 @@ pm_options_version_set(pm_options_t *options, const char *version, size_t length
         return false;
     }
 
-    if (length >= 4) {
-        if (strncmp(version, "3.3.", 4) == 0 && is_number(version + 4, length - 4)) {
+    if (length >= 4 && is_number(version + 4, length - 4)) {
+        if (strncmp(version, "3.3.", 4) == 0) {
             options->version = PM_OPTIONS_VERSION_CRUBY_3_3;
             return true;
         }
 
-        if (strncmp(version, "3.4.", 4) == 0 && is_number(version + 4, length - 4)) {
+        if (strncmp(version, "3.4.", 4) == 0) {
             options->version = PM_OPTIONS_VERSION_CRUBY_3_4;
             return true;
         }
 
-        if (strncmp(version, "3.5.", 4) == 0 && is_number(version + 4, length - 4)) {
-            options->version = PM_OPTIONS_VERSION_CRUBY_3_5;
-            return true;
-        }
-
-        if (strncmp(version, "4.0.", 4) == 0 && is_number(version + 4, length - 4)) {
+        if (strncmp(version, "3.5.", 4) == 0 || strncmp(version, "4.0.", 4) == 0) {
             options->version = PM_OPTIONS_VERSION_CRUBY_4_0;
             return true;
         }
diff --git a/src/prism.c b/src/prism.c
index 03b12e9db8..02dd2f1175 100644
--- a/src/prism.c
+++ b/src/prism.c
@@ -10864,11 +10864,11 @@ parser_lex(pm_parser_t *parser) {
                             }
 
 
-                            // If we are parsing as CRuby 3.5 or later and we
+                            // If we are parsing as CRuby 4.0 or later and we
                             // hit a '&&' or a '||' then we will lex the ignored
                             // newline.
                             if (
-                                (parser->version >= PM_OPTIONS_VERSION_CRUBY_3_5) &&
+                                (parser->version >= PM_OPTIONS_VERSION_CRUBY_4_0) &&
                                 following && (
                                     (peek_at(parser, following) == '&' && peek_at(parser, following + 1) == '&') ||
                                     (peek_at(parser, following) == '|' && peek_at(parser, following + 1) == '|') ||
@@ -10915,7 +10915,7 @@ parser_lex(pm_parser_t *parser) {
                             LEX(PM_TOKEN_AMPERSAND_DOT);
                         }
 
-                        if (parser->version >= PM_OPTIONS_VERSION_CRUBY_3_5) {
+                        if (parser->version >= PM_OPTIONS_VERSION_CRUBY_4_0) {
                             // If we hit an && then we are in a logical chain
                             // and we need to return the logical operator.
                             if (peek_at(parser, next_content) == '&' && peek_at(parser, next_content + 1) == '&') {
@@ -19625,7 +19625,7 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                 statements = (pm_node_t *) pm_statements_node_create(parser);
 
                 bool allow_command_call;
-                if (parser->version >= PM_OPTIONS_VERSION_CRUBY_3_5) {
+                if (parser->version >= PM_OPTIONS_VERSION_CRUBY_4_0) {
                     allow_command_call = accepts_command_call;
                 } else {
                     // Allow `def foo = puts "Hello"` but not `private def foo = puts "Hello"`
diff --git a/test/prism/api/parse_test.rb b/test/prism/api/parse_test.rb
index 1f885fa493..bb1761109f 100644
--- a/test/prism/api/parse_test.rb
+++ b/test/prism/api/parse_test.rb
@@ -119,6 +119,9 @@ def test_version
       assert Prism.parse_success?("1 + 1", version: "3.5")
       assert Prism.parse_success?("1 + 1", version: "3.5.0")
 
+      assert Prism.parse_success?("1 + 1", version: "4.0")
+      assert Prism.parse_success?("1 + 1", version: "4.0.0")
+
       assert Prism.parse_success?("1 + 1", version: "latest")
 
       # Test edge case
diff --git a/test/prism/fixtures/3.5/endless_methods_command_call.txt b/test/prism/fixtures/4.0/endless_methods_command_call.txt
similarity index 100%
rename from test/prism/fixtures/3.5/endless_methods_command_call.txt
rename to test/prism/fixtures/4.0/endless_methods_command_call.txt
diff --git a/test/prism/fixtures/3.5/leading_logical.txt b/test/prism/fixtures/4.0/leading_logical.txt
similarity index 100%
rename from test/prism/fixtures/3.5/leading_logical.txt
rename to test/prism/fixtures/4.0/leading_logical.txt
diff --git a/test/prism/fixtures_test.rb b/test/prism/fixtures_test.rb
index 0f0577c10d..2aebb18477 100644
--- a/test/prism/fixtures_test.rb
+++ b/test/prism/fixtures_test.rb
@@ -35,8 +35,8 @@ class FixturesTest < TestCase
     except << "3.3-3.3/return_in_sclass.txt"
 
     # Leaving these out until they are supported by parse.y.
-    except << "3.5/leading_logical.txt"
-    except << "3.5/endless_methods_command_call.txt"
+    except << "4.0/leading_logical.txt"
+    except << "4.0/endless_methods_command_call.txt"
     # https://bugs.ruby-lang.org/issues/21168#note-5
     except << "command_method_call_2.txt"
 
diff --git a/test/prism/lex_test.rb b/test/prism/lex_test.rb
index 9682bf8a32..19dd845d75 100644
--- a/test/prism/lex_test.rb
+++ b/test/prism/lex_test.rb
@@ -43,10 +43,10 @@ class LexTest < TestCase
     end
 
     # https://bugs.ruby-lang.org/issues/20925
-    except << "3.5/leading_logical.txt"
+    except << "4.0/leading_logical.txt"
 
     # https://bugs.ruby-lang.org/issues/17398#note-12
-    except << "3.5/endless_methods_command_call.txt"
+    except << "4.0/endless_methods_command_call.txt"
 
     # https://bugs.ruby-lang.org/issues/21168#note-5
     except << "command_method_call_2.txt"
diff --git a/test/prism/locals_test.rb b/test/prism/locals_test.rb
index 439625b750..814c9a9978 100644
--- a/test/prism/locals_test.rb
+++ b/test/prism/locals_test.rb
@@ -38,8 +38,8 @@ class LocalsTest < TestCase
       "3.3-3.3/return_in_sclass.txt",
 
       # Leaving these out until they are supported by parse.y.
-      "3.5/leading_logical.txt",
-      "3.5/endless_methods_command_call.txt",
+      "4.0/leading_logical.txt",
+      "4.0/endless_methods_command_call.txt",
       "command_method_call_2.txt"
     ]
 
diff --git a/test/prism/ractor_test.rb b/test/prism/ractor_test.rb
index 6169940beb..0e008ffb08 100644
--- a/test/prism/ractor_test.rb
+++ b/test/prism/ractor_test.rb
@@ -64,7 +64,7 @@ def with_ractor(*arguments, &block)
         else
           ractor = ignore_warnings { Ractor.new(*arguments, &block) }
 
-          # Somewhere in the Ruby 3.5.* series, Ractor#take was removed and
+          # Somewhere in the Ruby 4.0.* series, Ractor#take was removed and
           # Ractor#value was added.
           puts(ractor.respond_to?(:value) ? ractor.value : ractor.take)
         end
diff --git a/test/prism/ruby/parser_test.rb b/test/prism/ruby/parser_test.rb
index 3104369d3e..1629c36b38 100644
--- a/test/prism/ruby/parser_test.rb
+++ b/test/prism/ruby/parser_test.rb
@@ -69,10 +69,10 @@ class ParserTest < TestCase
       "3.4/circular_parameters.txt",
 
       # Cannot yet handling leading logical operators.
-      "3.5/leading_logical.txt",
+      "4.0/leading_logical.txt",
 
-      # Ruby >= 3.5 specific syntax
-      "3.5/endless_methods_command_call.txt",
+      # Ruby >= 4.0 specific syntax
+      "4.0/endless_methods_command_call.txt",
 
       # https://bugs.ruby-lang.org/issues/21168#note-5
       "command_method_call_2.txt",
@@ -172,6 +172,7 @@ def test_non_prism_builder_class_deprecated
     if RUBY_VERSION >= "3.3"
       def test_current_parser_for_current_ruby
         major, minor = current_major_minor.split(".")
+        return if major == "3" && minor == "5" # TODO: Remove once ruby-dev becomes 4.0
         # Let's just hope there never is a Ruby 3.10 or similar
         expected = major.to_i * 10 + minor.to_i
         assert_equal(expected, Translation::ParserCurrent.new.version)
diff --git a/test/prism/ruby/ripper_test.rb b/test/prism/ruby/ripper_test.rb
index 12c854aea6..400139acc0 100644
--- a/test/prism/ruby/ripper_test.rb
+++ b/test/prism/ruby/ripper_test.rb
@@ -9,7 +9,7 @@ class RipperTest < TestCase
     # Skip these tests that Ripper is reporting the wrong results for.
     incorrect = [
       # Not yet supported.
-      "3.5/leading_logical.txt",
+      "4.0/leading_logical.txt",
 
       # Ripper incorrectly attributes the block to the keyword.
       "seattlerb/block_break.txt",
@@ -40,7 +40,7 @@ class RipperTest < TestCase
       "3.4/circular_parameters.txt",
 
       # https://bugs.ruby-lang.org/issues/17398#note-12
-      "3.5/endless_methods_command_call.txt",
+      "4.0/endless_methods_command_call.txt",
 
       # https://bugs.ruby-lang.org/issues/21168#note-5
       "command_method_call_2.txt",
diff --git a/test/prism/ruby/ruby_parser_test.rb b/test/prism/ruby/ruby_parser_test.rb
index 42a888be82..fae5077e20 100644
--- a/test/prism/ruby/ruby_parser_test.rb
+++ b/test/prism/ruby/ruby_parser_test.rb
@@ -84,8 +84,8 @@ class RubyParserTest < TestCase
 
       "3.4/circular_parameters.txt",
 
-      "3.5/endless_methods_command_call.txt",
-      "3.5/leading_logical.txt",
+      "4.0/endless_methods_command_call.txt",
+      "4.0/leading_logical.txt",
 
       # https://bugs.ruby-lang.org/issues/21168#note-5
       "command_method_call_2.txt",
diff --git a/test/prism/test_helper.rb b/test/prism/test_helper.rb
index faf6117668..c03f70b2cd 100644
--- a/test/prism/test_helper.rb
+++ b/test/prism/test_helper.rb
@@ -230,7 +230,7 @@ def self.windows?
     end
 
     # All versions that prism can parse
-    SYNTAX_VERSIONS = %w[3.3 3.4 3.5 4.0]
+    SYNTAX_VERSIONS = %w[3.3 3.4 4.0]
 
     # Returns an array of ruby versions that a given filepath should test against:
     # test.txt         # => all available versions
@@ -256,6 +256,7 @@ def current_major_minor
 
     if RUBY_VERSION >= "3.3.0"
       def test_all_syntax_versions_present
+        return if RUBY_VERSION.start_with?("3.5") # TODO: Remove once ruby-dev becomes 4.0
         assert_include(SYNTAX_VERSIONS, current_major_minor)
       end
     end