diff --git a/c1.scm b/c1.rkt
similarity index 100%
rename from c1.scm
rename to c1.rkt
diff --git a/c2.scm b/c2.rkt
similarity index 100%
rename from c2.scm
rename to c2.rkt
diff --git a/explicate-control.scm b/explicate-control.rkt
similarity index 100%
rename from explicate-control.scm
rename to explicate-control.rkt
diff --git a/remove-complex-oper.scm b/remove-complex-oper.rkt
similarity index 99%
rename from remove-complex-oper.scm
rename to remove-complex-oper.rkt
index b934fe0..cf4af44 100644
--- a/remove-complex-oper.scm
+++ b/remove-complex-oper.rkt
@@ -1,6 +1,6 @@
 #lang racket
 
-(require "uniquify.scm")
+(require "uniquify.rkt")
 
 (provide remove-complex-opera*)
 
diff --git a/test-aarch64-run.scm b/test-aarch64-run.rkt
similarity index 82%
rename from test-aarch64-run.scm
rename to test-aarch64-run.rkt
index 40674b2..eae718c 100644
--- a/test-aarch64-run.scm
+++ b/test-aarch64-run.rkt
@@ -1,6 +1,6 @@
 #lang racket
 
-(require "test-util.scm")
+(require "test-util.rkt")
 
 (test-eq
  (compile-arm-asm "aarch64-hello.s" "a.out")
diff --git a/test-c2.scm b/test-c2.rkt
similarity index 88%
rename from test-c2.scm
rename to test-c2.rkt
index 9b0c21c..dd98e64 100644
--- a/test-c2.scm
+++ b/test-c2.rkt
@@ -1,7 +1,7 @@
 #lang racket
 
-(require "test-util.scm")
-(require "c2.scm")
+(require "test-util.rkt")
+(require "c2.rkt")
 
 (test-eq (env-head-value `((a 1))) 1)
 (test-eq (env-head-symbol `((a 1))) `a)
diff --git a/test-explicate-control.scm b/test-explicate-control.rkt
similarity index 92%
rename from test-explicate-control.scm
rename to test-explicate-control.rkt
index 0b40fc9..c02d509 100644
--- a/test-explicate-control.scm
+++ b/test-explicate-control.rkt
@@ -1,9 +1,9 @@
 #lang racket
 
-(require "test-util.scm")
-(require "remove-complex-oper.scm")
-(require "explicate-control.scm")
-(require "c2.scm")
+(require "test-util.rkt")
+(require "remove-complex-oper.rkt")
+(require "explicate-control.rkt")
+(require "c2.rkt")
 
 (define programs
   (list
diff --git a/test-remove-complex-opera.scm b/test-remove-complex-opera.rkt
similarity index 97%
rename from test-remove-complex-opera.scm
rename to test-remove-complex-opera.rkt
index bf48f55..00454ef 100644
--- a/test-remove-complex-opera.scm
+++ b/test-remove-complex-opera.rkt
@@ -1,8 +1,8 @@
 #lang racket
 
-(require "test-util.scm")
-(require "remove-complex-oper.scm")
-(require "c2.scm")
+(require "test-util.rkt")
+(require "remove-complex-oper.rkt")
+(require "c2.rkt")
 
 (define programs
   (list
diff --git a/test-uncover-locals.scm b/test-uncover-locals.rkt
similarity index 80%
rename from test-uncover-locals.scm
rename to test-uncover-locals.rkt
index 149cb03..07c41ce 100644
--- a/test-uncover-locals.scm
+++ b/test-uncover-locals.rkt
@@ -1,7 +1,7 @@
 #lang racket
 
-(require "uncover-locals.scm")
-(require "test-util.scm")
+(require "uncover-locals.rkt")
+(require "test-util.rkt")
 
 (define programs
     (list
diff --git a/test-uniquify.scm b/test-uniquify.rkt
similarity index 96%
rename from test-uniquify.scm
rename to test-uniquify.rkt
index bd3ab5b..2680978 100644
--- a/test-uniquify.scm
+++ b/test-uniquify.rkt
@@ -1,8 +1,8 @@
 #lang racket
 
-(require "test-util.scm")
-(require "uniquify.scm")
-(require "c2.scm")
+(require "test-util.rkt")
+(require "uniquify.rkt")
+(require "c2.rkt")
 
 (test-eq ((uniquify-exp (make-immutable-hash) (make-immutable-hash)) `(read))
          `(#hash() (read)))
diff --git a/test-util.scm b/test-util.rkt
similarity index 100%
rename from test-util.scm
rename to test-util.rkt
diff --git a/uncover-locals.scm b/uncover-locals.rkt
similarity index 100%
rename from uncover-locals.scm
rename to uncover-locals.rkt
diff --git a/uniquify.scm b/uniquify.rkt
similarity index 100%
rename from uniquify.scm
rename to uniquify.rkt