diff --git a/tzdata/southamerica b/tzdata/southamerica
index 9c4edcb7..7ad81708 100644
--- a/tzdata/southamerica
+++ b/tzdata/southamerica
@@ -1,5 +1,5 @@
 # <pre>
-# @(#)southamerica	8.40
+# @(#)southamerica	8.41
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 
@@ -1364,8 +1364,24 @@ Rule	Para	2002	2003	-	Sep	Sun>=1	0:00	1:00	S
 # Decree 1,867 (2004-03-05)
 # From Carlos Raul Perasso via Jesper Norgaard Welen (2006-10-13)
 # <http://www.presidencia.gov.py/decretos/D1867.pdf>
-Rule	Para	2004	max	-	Oct	Sun>=15	0:00	1:00	S
-Rule	Para	2005	max	-	Mar	Sun>=8	0:00	0	-
+Rule	Para	2004	2009	-	Oct	Sun>=15	0:00	1:00	S
+Rule	Para	2005	2009	-	Mar	Sun>=8	0:00	0	-
+# From Carlos Raul Perasso (2010-02-18):
+# By decree number 3958 issued yesterday (
+# <a href="http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf">
+# http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf
+# </a>
+# )
+# Paraguay changes its DST schedule, postponing the March rule to April and
+# modifying the October date. The decree reads:
+# ...
+# Art. 1. It is hereby established that from the second Sunday of the month of
+# April of this year (2010), the official time is to be set back 60 minutes,
+# and that on the first Sunday of the month of October, it is to be set
+# forward 60 minutes, in all the territory of the Paraguayan Republic.
+# ...
+Rule	Para	2010	max	-	Oct	Sun<=7	0:00	1:00	S
+Rule	Para	2010	max	-	Apr	Sun>=8	0:00	0	-
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Asuncion	-3:50:40 -	LMT	1890
diff --git a/zoneinfo/America/Asuncion.ics b/zoneinfo/America/Asuncion.ics
index 9314230a..2e75935d 100644
--- a/zoneinfo/America/Asuncion.ics
+++ b/zoneinfo/America/Asuncion.ics
@@ -2,8 +2,8 @@ BEGIN:VCALENDAR
 PRODID:-//github.com/libical/vzic//NONSGML ICS//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:/github.com/libical/tzdbics/20221031_2005c/America/Asuncion
-LAST-MODIFIED:20221031T143010Z
+TZID:/github.com/libical/tzdbics/20221031_2010c/America/Asuncion
+LAST-MODIFIED:20221031T155154Z
 X-LIC-LOCATION:America/Asuncion
 X-PROLEPTIC-TZNAME:LMT
 BEGIN:STANDARD
@@ -111,14 +111,28 @@ TZNAME:PYST
 TZOFFSETFROM:-0400
 TZOFFSETTO:-0300
 DTSTART:20041017T000000
-RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=3SU
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=3SU;UNTIL=20091018T040000Z
 END:DAYLIGHT
 BEGIN:STANDARD
 TZNAME:PYT
 TZOFFSETFROM:-0300
 TZOFFSETTO:-0400
 DTSTART:20050313T000000
-RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU;UNTIL=20090308T030000Z
 END:STANDARD
+BEGIN:STANDARD
+TZNAME:PYT
+TZOFFSETFROM:-0300
+TZOFFSETTO:-0400
+DTSTART:20100411T000000
+RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=2SU
+END:STANDARD
+BEGIN:DAYLIGHT
+TZNAME:PYST
+TZOFFSETFROM:-0400
+TZOFFSETTO:-0300
+DTSTART:20101003T000000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=1SU
+END:DAYLIGHT
 END:VTIMEZONE
 END:VCALENDAR