diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40b69d2..8fc7694 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,8 +8,8 @@ include(FeatureSummary)
 include(ExternalProject)
 ExternalProject_Add(
   mruby
-  URL https://github.com/mruby/mruby/archive/3.1.0.tar.gz
-  URL_HASH SHA512=b3699587689709b7411105ef468c28a6d89941dea356e6b3272b6ba1f69dc2d59e9c1ebc56c55208adc8b2ba878e21c8961ddd4603781748070fc78b6c2bbdb2
+  URL https://github.com/mruby/mruby/archive/3.2.0.tar.gz
+  URL_HASH SHA512=bb46fa0eda6507cabe775e3f9cceec6da64d5a96c20e704e7ada94f5b4906989553c363cfd85789c4adcb030a6cfd36b8a99d8247f32687c913bbe06edb9bbca
   CONFIGURE_COMMAND
     ""
   BUILD_COMMAND
diff --git a/README.md b/README.md
index 9ecea04..80e8901 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ tool_that_emits_json | rj '.map { |item| { one: item.foo, two: item.bar.name } }
 for building:
 - CMake
 - Ruby 2.5 or later
-- [whatever else mruby 3.1.0 needs][mruby_deps] :^)
+- [whatever else mruby 3.2.0 needs][mruby_deps] :^)
 
 ## Building
 
@@ -53,4 +53,4 @@ ruby ./test/rj_test.rb
 ./build/src/rj
 ```
 
-[mruby_deps]: https://github.com/mruby/mruby/blob/3.1.0/doc/guides/compile.md#prerequisites
+[mruby_deps]: https://github.com/mruby/mruby/blob/3.2.0/doc/guides/compile.md#prerequisites
diff --git a/mruby_config.rb b/mruby_config.rb
index 0015a18..a72ffdd 100644
--- a/mruby_config.rb
+++ b/mruby_config.rb
@@ -26,7 +26,7 @@
 # Hack to fix the preprocessor command in universal builds:
 
 class MRuby::Command::Compiler
-  # https://github.com/mruby/mruby/blob/3.1.0/lib/mruby/build/command.rb#L87-L100
+  # https://github.com/mruby/mruby/blob/3.2.0/lib/mruby/build/command.rb#L83-L96
   def run(outfile, infile, _defines=[], _include_paths=[], _flags=[])
     mkdir_p File.dirname(outfile)
     flags = all_flags(_defines, _include_paths, _flags)
diff --git a/test/fixtures/test_colours_ruby_symbols_and_other_classes_compact_stdout.txt b/test/fixtures/test_colours_ruby_symbols_and_other_classes_compact_stdout.txt
index 6926df5..f02a886 100644
--- a/test/fixtures/test_colours_ruby_symbols_and_other_classes_compact_stdout.txt
+++ b/test/fixtures/test_colours_ruby_symbols_and_other_classes_compact_stdout.txt
@@ -1 +1 @@
-{:symbol=>true,"class"=>Class,:method=>#<Method: #<Class:Rj>#__debug_info>}
+{:symbol=>true,"class"=>Class,:method=>#<Method: Rj.__debug_info>}
diff --git a/test/fixtures/test_colours_ruby_symbols_and_other_classes_stdout.txt b/test/fixtures/test_colours_ruby_symbols_and_other_classes_stdout.txt
index 2c7a9fb..c9020e3 100644
--- a/test/fixtures/test_colours_ruby_symbols_and_other_classes_stdout.txt
+++ b/test/fixtures/test_colours_ruby_symbols_and_other_classes_stdout.txt
@@ -1,5 +1,5 @@
 {
   :symbol => true,
   "class" => Class,
-  :method => #<Method: #<Class:Rj>#__debug_info>
+  :method => #<Method: Rj.__debug_info>
 }
diff --git a/test/fixtures/test_internals_compact_debug_stdout.txt b/test/fixtures/test_internals_compact_debug_stdout.txt
index ef86fb0..a6b1013 100644
--- a/test/fixtures/test_internals_compact_debug_stdout.txt
+++ b/test/fixtures/test_internals_compact_debug_stdout.txt
@@ -1 +1 @@
-{"colour":false,"compact":true,"debug":true,"output_format":"json","ruby":"mruby 3.1.0 (2022-05-12)"}
+{"colour":false,"compact":true,"debug":true,"output_format":"json","ruby":"mruby 3.2.0 (2023-02-24)"}
diff --git a/test/fixtures/test_internals_compact_stdout.txt b/test/fixtures/test_internals_compact_stdout.txt
index fcf9ccf..4754798 100644
--- a/test/fixtures/test_internals_compact_stdout.txt
+++ b/test/fixtures/test_internals_compact_stdout.txt
@@ -1 +1 @@
-{"colour":false,"compact":true,"debug":false,"output_format":"json","ruby":"mruby 3.1.0 (2022-05-12)"}
+{"colour":false,"compact":true,"debug":false,"output_format":"json","ruby":"mruby 3.2.0 (2023-02-24)"}
diff --git a/test/fixtures/test_internals_debug_stdout.txt b/test/fixtures/test_internals_debug_stdout.txt
index dfc0b47..6563df3 100644
--- a/test/fixtures/test_internals_debug_stdout.txt
+++ b/test/fixtures/test_internals_debug_stdout.txt
@@ -3,5 +3,5 @@
   "compact": false,
   "debug": true,
   "output_format": "json",
-  "ruby": "mruby 3.1.0 (2022-05-12)"
+  "ruby": "mruby 3.2.0 (2023-02-24)"
 }
diff --git a/test/fixtures/test_internals_noflags_stdout.txt b/test/fixtures/test_internals_noflags_stdout.txt
index d59b280..e3137b2 100644
--- a/test/fixtures/test_internals_noflags_stdout.txt
+++ b/test/fixtures/test_internals_noflags_stdout.txt
@@ -3,5 +3,5 @@
   "compact": false,
   "debug": false,
   "output_format": "json",
-  "ruby": "mruby 3.1.0 (2022-05-12)"
+  "ruby": "mruby 3.2.0 (2023-02-24)"
 }
diff --git a/test/fixtures/test_options_version_stdout.txt b/test/fixtures/test_options_version_stdout.txt
index 8387c0c..9c8f18a 100644
--- a/test/fixtures/test_options_version_stdout.txt
+++ b/test/fixtures/test_options_version_stdout.txt
@@ -1 +1 @@
-rj 0.4.0 (mruby 3.1.0)
+rj 0.4.0 (mruby 3.2.0)