diff --git a/doc/release-notes/mred/HISTORY.txt b/doc/release-notes/mred/HISTORY.txt
index 1a5d056542..bb043fc354 100644
--- a/doc/release-notes/mred/HISTORY.txt
+++ b/doc/release-notes/mred/HISTORY.txt
@@ -1,4 +1,4 @@
-Version 4.2.1, August 2009
+Version 4.2.1, July 2009
 
 Minor bug fixes
 
diff --git a/doc/release-notes/mzscheme/HISTORY.txt b/doc/release-notes/mzscheme/HISTORY.txt
index 63ed0f4c1a..860b7773bc 100644
--- a/doc/release-notes/mzscheme/HISTORY.txt
+++ b/doc/release-notes/mzscheme/HISTORY.txt
@@ -1,4 +1,4 @@
-Version 4.2.1, August 2009
+Version 4.2.1, July 2009
 Added string->unreadable-symbol and symbol-interned?
 Added syntax-local-lift-provide
 Added syntax-local-lift-values-expression