diff --git a/ChangeLog.rdoc b/ChangeLog.rdoc
index a7d3f79..23af4f9 100644
--- a/ChangeLog.rdoc
+++ b/ChangeLog.rdoc
@@ -8,6 +8,7 @@
 * Skip :until_valid is now fast for :asserted_value.
 * Added Section - a way to transform the data stream.
 * Added transforms for brotli, lz4, xor, zlib, zstd.
+* Updated to current minitest
 
 == Version 2.4.15 (2023-02-07)
 
diff --git a/bindata.gemspec b/bindata.gemspec
index 81d9f40..dabf93d 100644
--- a/bindata.gemspec
+++ b/bindata.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.required_ruby_version = ">= 2.5.0"
 
   s.add_development_dependency('rake')
-  s.add_development_dependency('minitest', "> 5.0.0", "< 5.12.0")
+  s.add_development_dependency('minitest', "> 5.0.0")
   s.add_development_dependency('simplecov')
   s.description = <<-END.gsub(/^ +/, "")
     BinData is a declarative way to read and write binary file formats.
diff --git a/lib/bindata/registry.rb b/lib/bindata/registry.rb
index f33650c..fa98665 100644
--- a/lib/bindata/registry.rb
+++ b/lib/bindata/registry.rb
@@ -123,7 +123,7 @@ def register_dynamic_class(name)
     def warn_if_name_is_already_registered(name, class_to_register)
       prev_class = @registry[name]
       if prev_class && prev_class != class_to_register
-        warn "warning: replacing registered class #{prev_class} " \
+        Kernel.warn "warning: replacing registered class #{prev_class} " \
              "with #{class_to_register}"
       end
     end
diff --git a/lib/bindata/string.rb b/lib/bindata/string.rb
index 795f8c5..0a4d50c 100644
--- a/lib/bindata/string.rb
+++ b/lib/bindata/string.rb
@@ -125,7 +125,7 @@ def sensible_default
     # Warns when reading if :value && no :read_length
     module WarnNoReadLengthPlugin
       def read_and_return_value(io)
-        warn "#{debug_name} does not have a :read_length parameter - returning empty string"
+        Kernel.warn "#{debug_name} does not have a :read_length parameter - returning empty string"
         ""
       end
     end
diff --git a/test/array_test.rb b/test/array_test.rb
index 76ebe19..afec8ad 100755
--- a/test/array_test.rb
+++ b/test/array_test.rb
@@ -18,17 +18,15 @@
   end
 
   it "warns about :length" do
-    Kernel.must_warn ":length is not used with BinData::Array.  You probably want to change this to :initial_length" do
-    obj = BinData::Array.new(type: :uint8, length: 3)
-      obj.read "123"
-    end
+    _ {
+      obj = BinData::Array.new(type: :uint8, length: 3)
+    }.must_warn ":length is not used with BinData::Array.  You probably want to change this to :initial_length"
   end
 
   it "warns about :read_length" do
-    Kernel.must_warn ":read_length is not used with BinData::Array.  You probably want to change this to :initial_length" do
-    obj = BinData::Array.new(type: :uint8, read_length: 3)
-      obj.read "123"
-    end
+    _ {
+      obj = BinData::Array.new(type: :uint8, read_length: 3)
+    }.must_warn ":read_length is not used with BinData::Array.  You probably want to change this to :initial_length"
   end
 
   it "fails if a given type is unknown" do
diff --git a/test/string_test.rb b/test/string_test.rb
index ad432e0..4793301 100755
--- a/test/string_test.rb
+++ b/test/string_test.rb
@@ -298,15 +298,15 @@ def snapshot
 describe BinData::String, "warnings" do
   it "warns if has :asserted_value but no :length" do
     obj = BinData::String.new(asserted_value: "ABC")
-    obj.must_warn "obj does not have a :read_length parameter - returning empty string" do
+    _ {
       _ { obj.read("abcde") }.must_raise BinData::ValidityError
-    end
+    }.must_warn "obj does not have a :read_length parameter - returning empty string"
   end
 
   it "warns if has :value but no :read_length" do
     obj = BinData::String.new(value: "ABC")
-    obj.must_warn "obj does not have a :read_length parameter - returning empty string" do
+    _ {
       obj.read("abcde")
-    end
+    }.must_warn "obj does not have a :read_length parameter - returning empty string"
   end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index c1ec64b..29089e6 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -32,32 +32,41 @@ def expose_methods_for_testing
   def value_read_from_written
     self.class.read(self.to_binary_s)
   end
+end
 
-  def must_equal_binary(expected)
-    must_equal expected.dup.force_encoding(Encoding::BINARY)
+module Minitest::Assertions
+  def assert_equals_binary(expected, actual)
+    assert_equal expected.dup.force_encoding(Encoding::BINARY), actual
   end
 
-  def must_raise_on_line(exp, line, msg = nil)
-    ex = self.must_raise exp
-    (ex.message).must_equal msg if msg
+  def assert_raises_on_line(exp, line, msg = nil, &block)
+    ex = assert_raises(exp, &block)
+    assert_equal(msg, ex.message) if msg
 
-    idx = ex.backtrace.find_index { |bt| /:in `must_raise_on_line'$/ =~ bt }
+    idx = ex.backtrace.find_index { |bt| /:in `assert_raises_on_line'$/ =~ bt }
 
     line_num_regex = /.*:(\d+)(:.*|$)/
     err_line = line_num_regex.match(ex.backtrace[0])[1].to_i
-    ref_line = line_num_regex.match(ex.backtrace[idx + 1])[1].to_i
+    ref_line = line_num_regex.match(ex.backtrace[idx + 2])[1].to_i
 
-    (err_line - ref_line).must_equal line
+    assert_equal((err_line - ref_line), line)
   end
 
-  def must_warn(msg, &block)
+  def assert_warns(msg, &block)
     result = ""
     callable = proc { |str|
       result = str
     }
-    self.stub(:warn, callable) do
+    Kernel.stub(:warn, callable) do
       block.call
     end
-    (result).must_equal msg
+
+    assert_equal msg, result
   end
 end
+
+module Minitest::Expectations
+  infect_an_assertion :assert_equals_binary, :must_equal_binary
+  infect_an_assertion :assert_raises_on_line, :must_raise_on_line, :block
+  infect_an_assertion :assert_warns, :must_warn, :block
+end