diff --git a/.github/actions/pr_notifier/pr_notifier.py b/.github/actions/pr_notifier/pr_notifier.py
index 4366327d2888..14ddcd0cf112 100644
--- a/.github/actions/pr_notifier/pr_notifier.py
+++ b/.github/actions/pr_notifier/pr_notifier.py
@@ -17,7 +17,9 @@
 import os
 import sys
 
+import requests
 import github
+import icalendar
 from slack_sdk import WebClient
 from slack_sdk.errors import SlackApiError
 
@@ -43,6 +45,9 @@
     'soulxu': 'U01GNQ3B8AY',
 }
 
+# Oncall calendar
+CALENDAR = "https://calendar.google.com/calendar/ical/d6glc0l5rc3v235q9l2j29dgovh3dn48%40import.calendar.google.com/public/basic.ics"
+
 # First pass reviewers who are not maintainers should get
 # notifications but not result in a PR not getting assigned a
 # maintainer owner.
@@ -226,10 +231,30 @@ def post_to_oncall(client, unassigned_prs, out_slo_prs):
             text=(
                 "*Untriaged Issues* (please tag and cc area experts)\n<%s|%s>" %
                 (issue_link, issue_link)))
+        # On Monday, post the new oncall.
+        if datetime.date.today().weekday() == 0:
+            oncall = parse_calendar()
+            client.chat_postMessage(channel='#envoy-maintainer-oncall', text=(oncall))
+            client.chat_postMessage(channel='#general', text=(oncall))
     except SlackApiError as e:
         print("Unexpected error %s", e.response["error"])
 
 
+def parse_calendar():
+    ical = requests.get(CALENDAR)
+    parsed_calendar = icalendar.Calendar.from_ical(ical.text)
+    ical.close()
+
+    now = datetime.datetime.now()
+    sunday = now - datetime.timedelta(days=now.weekday() + 1)
+
+    for component in parsed_calendar.walk():
+        if component.name == "VEVENT":
+            if (sunday.date() == component.decoded("dtstart").date()):
+                return component.get("summary")
+    return "unable to find this week's oncall"
+
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument(
diff --git a/.github/actions/pr_notifier/requirements.in b/.github/actions/pr_notifier/requirements.in
index b27ccacba25a..e564157d3eea 100644
--- a/.github/actions/pr_notifier/requirements.in
+++ b/.github/actions/pr_notifier/requirements.in
@@ -1,2 +1,4 @@
 pygithub
 slack_sdk
+requests
+icalendar
diff --git a/.github/actions/pr_notifier/requirements.txt b/.github/actions/pr_notifier/requirements.txt
index 3ef51ec40c41..cc6a4466bd8b 100644
--- a/.github/actions/pr_notifier/requirements.txt
+++ b/.github/actions/pr_notifier/requirements.txt
@@ -1,8 +1,8 @@
 #
-# This file is autogenerated by pip-compile
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
 #
-#    pip-compile --generate-hashes .github/actions/pr_notifier/requirements.txt
+#    pip-compile --allow-unsafe --generate-hashes requirements.in
 #
 certifi==2023.7.22 \
     --hash=sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082 \
@@ -167,6 +167,10 @@ deprecated==1.2.13 \
     --hash=sha256:43ac5335da90c31c24ba028af536a91d41d53f9e6901ddb021bcc572ce44e38d \
     --hash=sha256:64756e3e14c8c5eea9795d93c524551432a0be75629f8f29e67ab8caf076c76d
     # via pygithub
+icalendar==5.0.10 \
+    --hash=sha256:34f0ca020b804758ddf316eb70d1d46f769bce64638d5a080cb65dd46cfee642 \
+    --hash=sha256:6e392c2f301b6b5f49433e14c905db3de444b12876f3345f1856a75e9cd8be6f
+    # via -r requirements.in
 idna==2.10 \
     --hash=sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6 \
     --hash=sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0
@@ -207,10 +211,16 @@ python-dateutil==2.8.2 \
     --hash=sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86 \
     --hash=sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9
     # via pygithub
+pytz==2023.3.post1 \
+    --hash=sha256:7b4fddbeb94a1eba4b557da24f19fdf9db575192544270a9101d8509f9f43d7b \
+    --hash=sha256:ce42d816b81b68506614c11e8937d3aa9e41007ceb50bfdcb0749b921bf646c7
+    # via icalendar
 requests==2.31.0 \
     --hash=sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f \
     --hash=sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1
-    # via pygithub
+    # via
+    #   -r requirements.in
+    #   pygithub
 six==1.16.0 \
     --hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
     --hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254