diff --git a/requirements/testing.txt b/requirements/testing.txt
index 1d9ba464f..dc7050502 100644
--- a/requirements/testing.txt
+++ b/requirements/testing.txt
@@ -40,6 +40,10 @@ cryptography<46; implementation_name == "pypy" and python_version == "3.10"
 # Note: used only under slack_sdk/*_store.
 boto3<=2
 
+# certifi
+# Note: botocore verifies TLS with certifi; floor for the eMudhra CA distrust.
+certifi>=2026.10.19
+
 # moto
 # Note: for AWS tests.
 moto>=4.2.14,<6
diff --git a/tutorial/PythOnBoardingBot/requirements.txt b/tutorial/PythOnBoardingBot/requirements.txt
index b22c1e59c..8209ba0ca 100644
--- a/tutorial/PythOnBoardingBot/requirements.txt
+++ b/tutorial/PythOnBoardingBot/requirements.txt
@@ -1,3 +1,3 @@
 slack_sdk>=3.0
 slack_bolt>=1.6.1
-certifi
\ No newline at end of file
+certifi>=2026.10.19
\ No newline at end of file