diff --git a/collects/algol60/cfg-parser.ss b/collects/algol60/cfg-parser.rkt
similarity index 100%
rename from collects/algol60/cfg-parser.ss
rename to collects/algol60/cfg-parser.rkt
diff --git a/collects/parser-tools/examples/calc.ss b/collects/parser-tools/examples/calc.rkt
similarity index 100%
rename from collects/parser-tools/examples/calc.ss
rename to collects/parser-tools/examples/calc.rkt
diff --git a/collects/parser-tools/examples/read.ss b/collects/parser-tools/examples/read.rkt
similarity index 100%
rename from collects/parser-tools/examples/read.ss
rename to collects/parser-tools/examples/read.rkt
diff --git a/collects/parser-tools/info.ss b/collects/parser-tools/info.rkt
similarity index 62%
rename from collects/parser-tools/info.ss
rename to collects/parser-tools/info.rkt
index 9a0b87d..d29e869 100644
--- a/collects/parser-tools/info.ss
+++ b/collects/parser-tools/info.rkt
@@ -1,5 +1,5 @@
 #lang setup/infotab
 
-(define compile-omit-paths '("private-lex/error-tests.ss"))
+(define compile-omit-paths '("private-lex/error-tests.rkt"))
 
 (define scribblings '(("parser-tools.scrbl" (multi-page) (parsing-library))))
diff --git a/collects/parser-tools/lex-plt-v200.ss b/collects/parser-tools/lex-plt-v200.rkt
similarity index 100%
rename from collects/parser-tools/lex-plt-v200.ss
rename to collects/parser-tools/lex-plt-v200.rkt
diff --git a/collects/parser-tools/lex-sre.ss b/collects/parser-tools/lex-sre.rkt
similarity index 100%
rename from collects/parser-tools/lex-sre.ss
rename to collects/parser-tools/lex-sre.rkt
diff --git a/collects/parser-tools/lex.ss b/collects/parser-tools/lex.rkt
similarity index 100%
rename from collects/parser-tools/lex.ss
rename to collects/parser-tools/lex.rkt
diff --git a/collects/parser-tools/parser-tools.scrbl b/collects/parser-tools/parser-tools.scrbl
index a44f4c5..2954ae2 100644
--- a/collects/parser-tools/parser-tools.scrbl
+++ b/collects/parser-tools/parser-tools.scrbl
@@ -276,7 +276,7 @@ error.}
 
  A parameter that the lexer uses as the source location if it
  raises a @scheme[exn:fail:rad] error.  Setting this parameter allows
- DrScheme, for example, to open the file containing the error.}
+ DrRacket, for example, to open the file containing the error.}
 
 
 @; ----------------------------------------
diff --git a/collects/parser-tools/private-lex/actions.ss b/collects/parser-tools/private-lex/actions.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/actions.ss
rename to collects/parser-tools/private-lex/actions.rkt
diff --git a/collects/parser-tools/private-lex/deriv.ss b/collects/parser-tools/private-lex/deriv.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/deriv.ss
rename to collects/parser-tools/private-lex/deriv.rkt
diff --git a/collects/parser-tools/private-lex/error-tests.ss b/collects/parser-tools/private-lex/error-tests.rkt
similarity index 99%
rename from collects/parser-tools/private-lex/error-tests.ss
rename to collects/parser-tools/private-lex/error-tests.rkt
index 337e41e..92307f8 100644
--- a/collects/parser-tools/private-lex/error-tests.ss
+++ b/collects/parser-tools/private-lex/error-tests.rkt
@@ -1,7 +1,7 @@
 #lang scheme/base
 (require (for-syntax scheme/base)
          "../lex.ss"
-         schemeunit)
+         racunit)
 
 (define-syntax (catch-syn-error stx)
   (syntax-case stx ()
diff --git a/collects/parser-tools/private-lex/front.ss b/collects/parser-tools/private-lex/front.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/front.ss
rename to collects/parser-tools/private-lex/front.rkt
diff --git a/collects/parser-tools/private-lex/re.ss b/collects/parser-tools/private-lex/re.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/re.ss
rename to collects/parser-tools/private-lex/re.rkt
diff --git a/collects/parser-tools/private-lex/stx.ss b/collects/parser-tools/private-lex/stx.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/stx.ss
rename to collects/parser-tools/private-lex/stx.rkt
diff --git a/collects/parser-tools/private-lex/token-syntax.ss b/collects/parser-tools/private-lex/token-syntax.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/token-syntax.ss
rename to collects/parser-tools/private-lex/token-syntax.rkt
diff --git a/collects/parser-tools/private-lex/token.ss b/collects/parser-tools/private-lex/token.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/token.ss
rename to collects/parser-tools/private-lex/token.rkt
diff --git a/collects/parser-tools/private-lex/unicode-chars.ss b/collects/parser-tools/private-lex/unicode-chars.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/unicode-chars.ss
rename to collects/parser-tools/private-lex/unicode-chars.rkt
diff --git a/collects/parser-tools/private-lex/util.ss b/collects/parser-tools/private-lex/util.rkt
similarity index 100%
rename from collects/parser-tools/private-lex/util.ss
rename to collects/parser-tools/private-lex/util.rkt
diff --git a/collects/parser-tools/private-yacc/grammar.ss b/collects/parser-tools/private-yacc/grammar.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/grammar.ss
rename to collects/parser-tools/private-yacc/grammar.rkt
diff --git a/collects/parser-tools/private-yacc/graph.ss b/collects/parser-tools/private-yacc/graph.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/graph.ss
rename to collects/parser-tools/private-yacc/graph.rkt
diff --git a/collects/parser-tools/private-yacc/input-file-parser.ss b/collects/parser-tools/private-yacc/input-file-parser.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/input-file-parser.ss
rename to collects/parser-tools/private-yacc/input-file-parser.rkt
diff --git a/collects/parser-tools/private-yacc/lalr.ss b/collects/parser-tools/private-yacc/lalr.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/lalr.ss
rename to collects/parser-tools/private-yacc/lalr.rkt
diff --git a/collects/parser-tools/private-yacc/lr0.ss b/collects/parser-tools/private-yacc/lr0.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/lr0.ss
rename to collects/parser-tools/private-yacc/lr0.rkt
diff --git a/collects/parser-tools/private-yacc/parser-actions.ss b/collects/parser-tools/private-yacc/parser-actions.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/parser-actions.ss
rename to collects/parser-tools/private-yacc/parser-actions.rkt
diff --git a/collects/parser-tools/private-yacc/parser-builder.ss b/collects/parser-tools/private-yacc/parser-builder.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/parser-builder.ss
rename to collects/parser-tools/private-yacc/parser-builder.rkt
diff --git a/collects/parser-tools/private-yacc/table.ss b/collects/parser-tools/private-yacc/table.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/table.ss
rename to collects/parser-tools/private-yacc/table.rkt
diff --git a/collects/parser-tools/private-yacc/yacc-helper.ss b/collects/parser-tools/private-yacc/yacc-helper.rkt
similarity index 100%
rename from collects/parser-tools/private-yacc/yacc-helper.ss
rename to collects/parser-tools/private-yacc/yacc-helper.rkt
diff --git a/collects/parser-tools/yacc-to-scheme.ss b/collects/parser-tools/yacc-to-scheme.rkt
similarity index 100%
rename from collects/parser-tools/yacc-to-scheme.ss
rename to collects/parser-tools/yacc-to-scheme.rkt
diff --git a/collects/parser-tools/yacc.ss b/collects/parser-tools/yacc.rkt
similarity index 100%
rename from collects/parser-tools/yacc.ss
rename to collects/parser-tools/yacc.rkt