diff --git a/doc/Makefile b/doc/Makefile
index b0146d58..192139b2 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -3,7 +3,7 @@ SHELL = /bin/sh
 top_srcdir = ..
 
 PACKAGE      = upx
-VERSION_DATE = 11 Nov 2002
+VERSION_DATE = 12 Nov 2002
 VERSION     := $(shell sed -n 's/^.*UPX_VERSION_STRING .*"\(.*\)".*/\1/p' $(top_srcdir)/src/version.h)
 
 TRIMSPACE = cat
diff --git a/src/version.h b/src/version.h
index 5e98a332..cb0ce359 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,4 +1,4 @@
-#define UPX_VERSION_HEX         0x019000        /* 01.90.00 */
-#define UPX_VERSION_STRING      "1.90"
-#define UPX_VERSION_STRING4     "1.90"
-#define UPX_VERSION_DATE        "Nov 11th 2002"
+#define UPX_VERSION_HEX         0x019100        /* 01.91.00 */
+#define UPX_VERSION_STRING      "1.91 beta"
+#define UPX_VERSION_STRING4     "1.91"
+#define UPX_VERSION_DATE        "Nov 12th 2002"