diff --git a/runtime/syntax/cpp.vim b/runtime/syntax/cpp.vim
index 3ad79d5..5437580 100644
--- a/runtime/syntax/cpp.vim
+++ b/runtime/syntax/cpp.vim
@@ -2,7 +2,7 @@
 " Language:	C++
 " Current Maintainer:	vim-jp (https://github.com/vim-jp/vim-cpp)
 " Previous Maintainer:	Ken Shan <ccshan@post.harvard.edu>
-" Last Change:	2021 May 04
+" Last Change:	2021 Aug 23
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -60,7 +60,7 @@
   syn match cppFloat		display contained "\<\d\+\.\d*\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
   syn match cppFloat		display contained "\<\.\d\+\(e[-+]\=\d\+\)\=\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
   syn match cppFloat		display contained "\<\d\+e[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
-  syn region cppString		start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"\(sv\|s\|_\i*\)\=+ end='$' contains=cSpecial,cFormat,@Spell
+  syn region cppString		start=+\(L\|u\|u8\|U\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"\(sv\|s\|_\i*\)\=+ end='$' contains=cSpecial,cFormat,@Spell
 endif
 
 " C++ 17 extensions
@@ -69,6 +69,20 @@
   syn match cppCast		"\<reinterpret_pointer_cast\s*$"
   syn match cppFloat		display contained "\<0x\x*\.\x\+p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
   syn match cppFloat		display contained "\<0x\x\+\.\=p[-+]\=\d\+\([FfLl]\|i[fl]\=\|h\|min\|s\|ms\|us\|ns\|_\i*\)\=\>"
+
+  " TODO: push this up to c.vim if/when supported in C23
+  syn match cppCharacter	"u8'[^\\]'"
+  syn match cppCharacter	"u8'[^']*'" contains=cSpecial
+  if exists("c_gnu")
+    syn match cppSpecialError	  "u8'\\[^'\"?\\abefnrtv]'"
+    syn match cppSpecialCharacter "u8'\\['\"?\\abefnrtv]'"
+  else
+    syn match cppSpecialError	  "u8'\\[^'\"?\\abfnrtv]'"
+    syn match cppSpecialCharacter "u8'\\['\"?\\abfnrtv]'"
+  endif
+  syn match cppSpecialCharacter display "u8'\\\o\{1,3}'"
+  syn match cppSpecialCharacter display "u8'\\x\x\+'"
+
 endif
 
 " C++ 20 extensions
@@ -99,6 +113,9 @@
 hi def link cppStorageClass	StorageClass
 hi def link cppStructure		Structure
 hi def link cppBoolean		Boolean
+hi def link cppCharacter		cCharacter
+hi def link cppSpecialCharacter		cSpecialCharacter
+hi def link cppSpecialError		cSpecialError
 hi def link cppConstant		Constant
 hi def link cppRawStringDelimiter	Delimiter
 hi def link cppRawString		String
diff --git a/runtime/syntax/gemtext.vim b/runtime/syntax/gemtext.vim
new file mode 100644
index 0000000..8c2bd29
--- /dev/null
+++ b/runtime/syntax/gemtext.vim
@@ -0,0 +1,24 @@
+" Vim syntax file
+" Language:             Gemtext markup language
+" Maintainer:           Suneel Freimuth <suneelfreimuth1@gmail.com>
+" Latest Revision:      2020-11-21
+" Filenames:            *.gmi
+
+if exists('b:current_syntax')
+    finish
+endif
+
+syntax match  Heading  /^#\{1,3}.\+$/
+syntax match  List     /^\* /
+syntax match  LinkURL  /^=>\s*\S\+/
+syntax match  Quote    /^>.\+/
+syntax region Preformatted start=/^```/ end=/```/
+
+highlight default link Heading  Special
+highlight default link List     Statement
+highlight default link LinkURL  Underlined
+highlight default link Quote    Constant
+highlight default link Preformatted Identifier
+
+let b:current_syntax = 'gemtext'
+
diff --git a/runtime/syntax/scala.vim b/runtime/syntax/scala.vim
index 89a936a..16e1147 100644
--- a/runtime/syntax/scala.vim
+++ b/runtime/syntax/scala.vim
@@ -3,8 +3,7 @@
 " Maintainer:           Derek Wyatt
 " URL:                  https://github.com/derekwyatt/vim-scala
 " License:              Same as Vim
-" Last Change:          2021 Aug 11
-"                       by Jesse Atkinson, PR #8746
+" Last Change:          23 August 2021
 " ----------------------------------------------------------------------------
 
 if !exists('main_syntax')
@@ -103,9 +102,9 @@
 syn match scalaTypeTypeDeclaration /\%(⇒\|=>\)\ze/ contained nextgroup=scalaTypeTypeDeclaration contains=scalaTypeTypeExtension skipwhite
 syn match scalaTypeTypeDeclaration /\<[_\.A-Za-z0-9$]\+\>/ contained nextgroup=scalaTypeTypeExtension,scalaTypeTypeEquals skipwhite
 syn match scalaTypeTypeEquals /=\ze[^>]/ contained nextgroup=scalaTypeTypePostDeclaration skipwhite
-syn match scalaTypeTypeExtension /)\?\_s*\zs\%(⇒\|=>\|<:\|:>\|=:=\|::\|#\)/ contained nextgroup=scalaTypeTypeDeclaration skipwhite
+syn match scalaTypeTypeExtension /)\?\_s*\zs\%(⇒\|=>\|<:\|:>\|=:=\|::\|#\)/ contained contains=scalaTypeOperator nextgroup=scalaTypeTypeDeclaration skipwhite
 syn match scalaTypeTypePostDeclaration /\<[_\.A-Za-z0-9$]\+\>/ contained nextgroup=scalaTypeTypePostExtension skipwhite
-syn match scalaTypeTypePostExtension /\%(⇒\|=>\|<:\|:>\|=:=\|::\)/ contained nextgroup=scalaTypeTypePostDeclaration skipwhite
+syn match scalaTypeTypePostExtension /\%(⇒\|=>\|<:\|:>\|=:=\|::\)/ contained contains=scalaTypeOperator nextgroup=scalaTypeTypePostDeclaration skipwhite
 hi link scalaTypeTypeDeclaration Type
 hi link scalaTypeTypeExtension Keyword
 hi link scalaTypeTypePostDeclaration Special
@@ -114,21 +113,23 @@
 syn match scalaTypeDeclaration /(/ contained nextgroup=scalaTypeExtension contains=scalaRoundBrackets skipwhite
 syn match scalaTypeDeclaration /\%(⇒\|=>\)\ze/ contained nextgroup=scalaTypeDeclaration contains=scalaTypeExtension skipwhite
 syn match scalaTypeDeclaration /\<[_\.A-Za-z0-9$]\+\>/ contained nextgroup=scalaTypeExtension skipwhite
-syn match scalaTypeExtension /)\?\_s*\zs\%(⇒\|=>\|<:\|:>\|=:=\|::\|#\)/ contained nextgroup=scalaTypeDeclaration skipwhite
+syn match scalaTypeExtension /)\?\_s*\zs\%(⇒\|=>\|<:\|:>\|=:=\|::\|#\)/ contained contains=scalaTypeOperator nextgroup=scalaTypeDeclaration skipwhite
 hi link scalaTypeDeclaration Type
 hi link scalaTypeExtension Keyword
 hi link scalaTypePostExtension Keyword
 
 syn match scalaTypeAnnotation /\%([_a-zA-Z0-9$\s]:\_s*\)\ze[_=(\.A-Za-z0-9$]\+/ skipwhite nextgroup=scalaTypeDeclaration contains=scalaRoundBrackets
 syn match scalaTypeAnnotation /)\_s*:\_s*\ze[_=(\.A-Za-z0-9$]\+/ skipwhite nextgroup=scalaTypeDeclaration
-hi link scalaTypeAnnotation Normal
+hi clear scalaTypeAnnotation
 
-syn match scalaCaseFollowing /\<[_\.A-Za-z0-9$]\+\>/ contained
-syn match scalaCaseFollowing /`[^`]\+`/ contained
+syn match scalaCaseFollowing /\<[_\.A-Za-z0-9$]\+\>/ contained contains=scalaCapitalWord
+syn match scalaCaseFollowing /`[^`]\+`/ contained contains=scalaCapitalWord
 hi link scalaCaseFollowing Special
 
-syn keyword scalaKeywordModifier abstract override final lazy implicit implicitly private protected sealed null require super
+syn keyword scalaKeywordModifier abstract override final lazy implicit private protected sealed null super
+syn keyword scalaSpecialFunction implicitly require
 hi link scalaKeywordModifier Function
+hi link scalaSpecialFunction Function
 
 syn keyword scalaSpecial this true false ne eq
 syn keyword scalaSpecial new nextgroup=scalaInstanceDeclaration skipwhite
@@ -152,14 +153,14 @@
 syn match scalaInterpolation /\$[a-zA-Z0-9_$]\+/ contained
 exe 'syn region scalaInterpolationB matchgroup=scalaInterpolationBoundary start=/\${/ end=/}/ contained contains=' . s:ContainedGroup()
 hi link scalaInterpolation Function
-hi link scalaInterpolationB Normal
+hi clear scalaInterpolationB
 
 syn region scalaFString matchgroup=scalaInterpolationBrackets start=/f"/ skip=/\\"/ end=/"/ contains=scalaFInterpolation,scalaFInterpolationB,scalaEscapedChar,scalaUnicodeChar
 syn match scalaFInterpolation /\$[a-zA-Z0-9_$]\+\(%[-A-Za-z0-9\.]\+\)\?/ contained
 exe 'syn region scalaFInterpolationB matchgroup=scalaInterpolationBoundary start=/${/ end=/}\(%[-A-Za-z0-9\.]\+\)\?/ contained contains=' . s:ContainedGroup()
 hi link scalaFString String
 hi link scalaFInterpolation Function
-hi link scalaFInterpolationB Normal
+hi clear scalaFInterpolationB
 
 syn region scalaTripleString start=/"""/ end=/"""\%([^"]\|$\)/ contains=scalaEscapedChar,scalaUnicodeChar
 syn region scalaTripleFString matchgroup=scalaInterpolationBrackets start=/f"""/ end=/"""\%([^"]\|$\)/ contains=scalaFInterpolation,scalaFInterpolationB,scalaEscapedChar,scalaUnicodeChar
@@ -200,7 +201,6 @@
 hi link scalaParameterAnnotation Function
 hi link scalaParamAnnotationValue Keyword
 hi link scalaCommentAnnotation Function
-hi link scalaCommentCodeBlockBrackets String
 hi link scalaCommentCodeBlock String
 hi link scalaTodo Todo
 
diff --git a/runtime/syntax/structurizr.vim b/runtime/syntax/structurizr.vim
new file mode 100644
index 0000000..73629b1
--- /dev/null
+++ b/runtime/syntax/structurizr.vim
@@ -0,0 +1,76 @@
+" Vim syntax file
+" Language:      Structurizr DSL
+" Maintainer:    Bastian Venthur <venthur@debian.org>
+" Last Change:   2021-08-16
+" Remark:        For a language reference, see
+"                https://github.com/structurizr/dsl
+
+
+if exists("b:current_syntax")
+    finish
+endif
+
+syn case ignore
+
+" comments
+syn match scomment "#.*$"
+syn match scomment "//.*$"
+syn region scomment start="/\*" end="\*/"
+
+" keywords
+syn keyword skeyword animation
+syn keyword skeyword autoLayout
+syn keyword skeyword branding
+syn keyword skeyword component
+syn keyword skeyword configuration
+syn keyword skeyword container
+syn keyword skeyword containerinstance
+syn keyword skeyword custom
+syn keyword skeyword deployment
+syn keyword skeyword deploymentenvironment
+syn keyword skeyword deploymentgroup
+syn keyword skeyword deploymentnode
+syn keyword skeyword dynamic
+syn keyword skeyword element
+syn keyword skeyword enterprise
+syn keyword skeyword exclude
+syn keyword skeyword filtered
+syn keyword skeyword group
+syn keyword skeyword healthcheck
+syn keyword skeyword impliedrelationships
+syn keyword skeyword include
+syn keyword skeyword infrastructurenode
+syn keyword skeyword model
+syn keyword skeyword person
+syn keyword skeyword perspectives
+syn keyword skeyword properties
+syn keyword skeyword relationship
+syn keyword skeyword softwaresystem
+syn keyword skeyword softwaresysteminstance
+syn keyword skeyword styles
+syn keyword skeyword systemcontext
+syn keyword skeyword systemlandscape
+syn keyword skeyword tags
+syn keyword skeyword terminology
+syn keyword skeyword theme
+syn keyword skeyword title
+syn keyword skeyword url
+syn keyword skeyword users
+syn keyword skeyword views
+syn keyword skeyword workspace
+
+syn match skeyword "\!adrs\s\+"
+syn match skeyword "\!constant\s\+"
+syn match skeyword "\!docs\s\+"
+syn match skeyword "\!identifiers\s\+"
+syn match skeyword "\!include\s\+"
+
+syn region sstring oneline start='"' end='"'
+
+syn region sblock start='{' end='}' fold transparent
+
+hi def link sstring string
+hi def link scomment comment
+hi def link skeyword keyword
+
+let b:current_syntax = "structurizr"