diff --git a/lexers/a/awk.go b/lexers/a/awk.go
index d9198f1..744d4c1 100644
--- a/lexers/a/awk.go
+++ b/lexers/a/awk.go
@@ -30,14 +30,14 @@ var Awk = internal.Register(MustNewLexer(
 		"root": {
 			{`^(?=\s|/)`, Text, Push("slashstartsregex")},
 			Include("commentsandwhitespace"),
-			{`\+\+|--|\|\||&&|in\b|\$|!?~|(\*\*|[-<>+*%\^/!=|])=?`, Operator, Push("slashstartsregex")},
+			{`\+\+|--|\|\||&&|in\b|\$|!?~|\|&|(\*\*|[-<>+*%\^/!=|])=?`, Operator, Push("slashstartsregex")},
 			{`[{(\[;,]`, Punctuation, Push("slashstartsregex")},
 			{`[})\].]`, Punctuation, nil},
-			{`(break|continue|do|while|exit|for|if|else|return)\b`, Keyword, Push("slashstartsregex")},
+			{`(break|continue|do|while|exit|for|if|else|return|switch|case|default)\b`, Keyword, Push("slashstartsregex")},
 			{`function\b`, KeywordDeclaration, Push("slashstartsregex")},
-			{`(atan2|cos|exp|int|log|rand|sin|sqrt|srand|gensub|gsub|index|length|match|split|sprintf|sub|substr|tolower|toupper|close|fflush|getline|next|nextfile|print|printf|strftime|systime|delete|system)\b`, KeywordReserved, nil},
-			{`(ARGC|ARGIND|ARGV|BEGIN|CONVFMT|ENVIRON|END|ERRNO|FIELDWIDTHS|FILENAME|FNR|FS|IGNORECASE|NF|NR|OFMT|OFS|ORFS|RLENGTH|RS|RSTART|RT|SUBSEP)\b`, NameBuiltin, nil},
-			{`[$a-zA-Z_]\w*`, NameOther, nil},
+			{`(atan2|cos|exp|int|log|rand|sin|sqrt|srand|gensub|gsub|index|length|match|split|patsplit|sprintf|sub|substr|tolower|toupper|close|fflush|getline|next(file)|print|printf|strftime|systime|mktime|delete|system|strtonum|and|compl|lshift|or|rshift|asorti?|isarray|bindtextdomain|dcn?gettext|@(include|load|namespace))\b`, KeywordReserved, nil},
+			{`(ARGC|ARGIND|ARGV|BEGIN(FILE)?|BINMODE|CONVFMT|ENVIRON|END(FILE)?|ERRNO|FIELDWIDTHS|FILENAME|FNR|FPAT|FS|IGNORECASE|LINT|NF|NR|OFMT|OFS|ORS|PROCINFO|RLENGTH|RS|RSTART|RT|SUBSEP|TEXTDOMAIN)\b`, NameBuiltin, nil},
+			{`[@$a-zA-Z_]\w*`, NameOther, nil},
 			{`[0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?`, LiteralNumberFloat, nil},
 			{`0x[0-9a-fA-F]+`, LiteralNumberHex, nil},
 			{`[0-9]+`, LiteralNumberInteger, nil},