diff --git a/lexer/lexer.go b/lexer/lexer.go
index cfa0543..b3a50ac 100644
--- a/lexer/lexer.go
+++ b/lexer/lexer.go
@@ -242,9 +242,15 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		err = lexer.nextRune()
 	case '!':
 		token := lexer.newToken()
-		token.kind = TokenKindExclamation
-		lexer.addToken(token)
 		err = lexer.nextRune()
+		if err != nil { return }
+		token.kind = TokenKindExclamation
+		if lexer.char == '=' {
+			token.kind = TokenKindNotEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
+		}
+		lexer.addToken(token)
 	case '%':
 		token := lexer.newToken()
 		token.kind = TokenKindPercent
@@ -255,6 +261,11 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		token.kind = TokenKindTilde
 		lexer.addToken(token)
 		err = lexer.nextRune()
+	case '=':
+		token := lexer.newToken()
+		token.kind = TokenKindEqualTo
+		lexer.addToken(token)
+		err = lexer.nextRune()
 	case '<':
 		token := lexer.newToken()
 		err = lexer.nextRune()
@@ -264,6 +275,10 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 			token.kind = TokenKindLShift
 			err = lexer.nextRune()
 			token.location.SetWidth(2)
+		} else if lexer.char == '=' {
+			token.kind = TokenKindLessThanEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '>':
@@ -275,6 +290,10 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 			token.kind = TokenKindRShift
 			err = lexer.nextRune()
 			token.location.SetWidth(2)
+		} else if lexer.char == '=' {
+			token.kind = TokenKindGreaterThanEqualTo
+			err = lexer.nextRune()
+			token.location.SetWidth(2)
 		}
 		lexer.addToken(token)
 	case '|':
diff --git a/lexer/lexer_test.go b/lexer/lexer_test.go
index 6f2aec1..e77d9f5 100644
--- a/lexer/lexer_test.go
+++ b/lexer/lexer_test.go
@@ -154,12 +154,12 @@ func TestTokenizeAll (test *testing.T) {
 		quickToken(1, TokenKindPercent, nil),
 		quickToken(1, TokenKindTilde, nil),
 		quickToken(1, TokenKindEqualTo, nil),
-		quickToken(1, TokenKindNotEqualTo, nil),
+		quickToken(2, TokenKindNotEqualTo, nil),
 		quickToken(1, TokenKindLessThan, nil),
-		quickToken(1, TokenKindLessThanEqualTo, nil),
+		quickToken(2, TokenKindLessThanEqualTo, nil),
 		quickToken(2, TokenKindLShift, nil),
 		quickToken(1, TokenKindGreaterThan, nil),
-		quickToken(1, TokenKindGreaterThanEqualTo, nil),
+		quickToken(2, TokenKindGreaterThanEqualTo, nil),
 		quickToken(2, TokenKindRShift, nil),
 		quickToken(1, TokenKindBinaryOr, nil),
 		quickToken(2, TokenKindLogicalOr, nil),
diff --git a/tests/lexer/all.arf b/tests/lexer/all.arf
index 07e0298..51ae12e 100644
--- a/tests/lexer/all.arf
+++ b/tests/lexer/all.arf
@@ -1,3 +1,3 @@
 :arf
 --- rw -> -349820394 932748397 239485.37520 "hello world!\n" 'E' helloWorld:.,..[]{}
-+ - ++ -- * / @ ! % ~ = != < <= << > => >> | || & &&
++ - ++ -- * / @ ! % ~ = != < <= << > >= >> | || & &&