diff --git a/gh2slack.py b/gh2slack.py
index f3c0213..7dbced2 100755
--- a/gh2slack.py
+++ b/gh2slack.py
@@ -273,19 +273,20 @@ def process_news(
     for html_url in to_publish:
         cache_item = cache.items[html_url]
         try:
-            msg_blocks = [
-                format_message(
-                    logger,
-                    gh_data.repo_owner,
-                    gh_data.repo_name,
-                    ALIASES[gh_data.repo_section],
-                    html_url,
-                    cache_item,
-                )
-            ]
+            msg_block = format_message(
+                logger,
+                gh_data.repo_owner,
+                gh_data.repo_name,
+                ALIASES[gh_data.repo_section],
+                html_url,
+                cache_item,
+            )
+            msg_blocks = [msg_block]
+            msg_as_text = msg_block["text"]["text"]
             rss2slack.post_to_slack(
                 logger,
                 msg_blocks,
+                msg_as_text,
                 slack_client,
                 slack_channel,
             )
diff --git a/git_commits2slack.py b/git_commits2slack.py
index 78d5d1e..902bee5 100755
--- a/git_commits2slack.py
+++ b/git_commits2slack.py
@@ -193,6 +193,7 @@ def main():
             args.git_web, branch_name, repo_name, commit_count
         )
         msg_blocks.insert(0, heading)
+        msg_as_text = heading["text"]["text"]
 
         slack_client = rss2slack.get_slack_web_client(
             slack_token, args.slack_base_url, args.slack_timeout
@@ -200,6 +201,7 @@ def main():
         rss2slack.post_to_slack(
             logger,
             msg_blocks,
+            msg_as_text,
             slack_client,
             args.slack_channel,
         )
diff --git a/phpbb2slack.py b/phpbb2slack.py
index 9d67cdf..35ff527 100755
--- a/phpbb2slack.py
+++ b/phpbb2slack.py
@@ -224,11 +224,14 @@ def process_news(
 ):
     """Process news and post it to Slack."""
     for url in list(news.keys()):
-        msg_blocks = [format_message(url, news[url], handle)]
+        msg_block = format_message(url, news[url], handle)
+        msg_blocks = [msg_block]
+        msg_as_text = msg_block["text"]["text"]
         try:
             rss2slack.post_to_slack(
                 logger,
                 msg_blocks,
+                msg_as_text,
                 slack_client,
                 slack_channel,
             )
diff --git a/requirements.txt b/requirements.txt
index 22d6c1b..da04723 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 feedparser==6.0.12
 requests==2.32.5
-slackclient==2.9.4
+slack-sdk==3.40.1
diff --git a/rss2slack.py b/rss2slack.py
index 4d39833..f08549f 100755
--- a/rss2slack.py
+++ b/rss2slack.py
@@ -13,7 +13,7 @@
 from typing import List
 from typing import Tuple
 
-from slack import WebClient
+from slack_sdk import WebClient
 
 import rss2irc
 from lib import cli_args
@@ -174,14 +174,19 @@ def parse_args() -> argparse.Namespace:
 def post_to_slack(
     logger: logging.Logger,
     msg_blocks: List,
+    msg_as_text: str,
     slack_client: WebClient,
     slack_channel: str,
 ) -> None:
     """Post news to Slack channel."""
     try:
         logger.debug("Will post %s", repr(msg_blocks))
+        # NOTE(zstyblik): "we highly recommended that you include text to
+        # provide a fallback when using blocks."
         rsp = slack_client.chat_postMessage(
-            channel=slack_channel, blocks=msg_blocks
+            channel=slack_channel,
+            blocks=msg_blocks,
+            text=msg_as_text,
         )
         logger.debug("Response from Slack: %s", rsp)
         if not rsp:
@@ -208,11 +213,14 @@ def process_news(
 ) -> None:
     """Process news and post it to Slack."""
     for url in list(news.keys()):
-        msg_blocks = [format_message(url, news[url], handle)]
+        msg_block = format_message(url, news[url], handle)
+        msg_blocks = [msg_block]
+        msg_as_text = msg_block["text"]["text"]
         try:
             post_to_slack(
                 logger,
                 msg_blocks,
+                msg_as_text,
                 slack_client,
                 slack_channel,
             )
diff --git a/tests/test_gh2slack.py b/tests/test_gh2slack.py
index 7f3933b..c79e6c5 100644
--- a/tests/test_gh2slack.py
+++ b/tests/test_gh2slack.py
@@ -261,6 +261,11 @@ def test_main_ideal(
                 }
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "[<https://github.com/test-user/test-repo|"
+                + "test-user/test-repo>] <http://example.com/bar|"
+                + "pr#1> | some title#2"
+            ),
         },
         {
             "blocks": [
@@ -277,6 +282,11 @@ def test_main_ideal(
                 }
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "[<https://github.com/test-user/test-repo|"
+                + "test-user/test-repo>] "
+                + "<http://example.com/foo|pr#0> | some title#1"
+            ),
         },
     ]
     #
diff --git a/tests/test_git_commits2slack.py b/tests/test_git_commits2slack.py
index 5bd8856..45bae10 100644
--- a/tests/test_git_commits2slack.py
+++ b/tests/test_git_commits2slack.py
@@ -340,6 +340,10 @@ def test_main_ideal(
                 },
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "<http://example.com/tree/master|"
+                + "[{}:master]> 1 commit".format(repo_name)
+            ),
         }
     ]
     #
diff --git a/tests/test_phpbb2slack.py b/tests/test_phpbb2slack.py
index 1851a1a..0afe4d6 100644
--- a/tests/test_phpbb2slack.py
+++ b/tests/test_phpbb2slack.py
@@ -137,6 +137,11 @@ def test_main_ideal(
                 }
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "[test] <https://phpbb.example.com/threads/"
+                + "something-of-something.424837/"
+                + "|Some other problem> (0)"
+            ),
         }
     ]
 
diff --git a/tests/test_rss2slack.py b/tests/test_rss2slack.py
index 2968338..b411239 100644
--- a/tests/test_rss2slack.py
+++ b/tests/test_rss2slack.py
@@ -115,6 +115,10 @@ def test_main_ideal(
                 }
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "[test] <http://www.example.com/scan.php?"
+                + "page=news_item&px=item1|Item1>"
+            ),
         },
         {
             "blocks": [
@@ -130,6 +134,10 @@ def test_main_ideal(
                 }
             ],
             "channel": expected_slack_channel,
+            "text": (
+                "[test] <http://www.example.com/scan.php?"
+                + "page=news_item&px=item2|Item2>"
+            ),
         },
     ]
     # Mock/set SLACK_TOKEN