diff --git a/README.md b/README.md
index d6522b8..b8c43ae 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,7 @@ Install just the python library
 ```
 $ virtualenv .ve --python python3
 $ source .ve/bin/activate
+$ pip install --upgrade pip
 $ pip install -e .
 ```
 
diff --git a/requirements_cove.in b/requirements_cove.in
index 914971a..236b995 100644
--- a/requirements_cove.in
+++ b/requirements_cove.in
@@ -21,3 +21,4 @@ xmltodict
 rangedict
 openpyxl
 whitenoise
+certifi>=2026.10.19         # Response to eMudhra/emSign CA certificate security incident.
\ No newline at end of file
diff --git a/requirements_cove.txt b/requirements_cove.txt
index 9dfefb1..e9e02ef 100644
--- a/requirements_cove.txt
+++ b/requirements_cove.txt
@@ -18,7 +18,7 @@ btrees==6.1
     # via zodb
 cached-property==2.0.1
     # via -r requirements_cove.in
-certifi==2025.1.31
+certifi==2026.10.19
     # via
     #   requests
     #   sentry-sdk
diff --git a/requirements_cove_dev.txt b/requirements_cove_dev.txt
index f4417bf..fbfa4de 100644
--- a/requirements_cove_dev.txt
+++ b/requirements_cove_dev.txt
@@ -28,8 +28,9 @@ btrees==6.1
     # via zodb
 cached-property==2.0.1
     # via -r requirements_cove.in
-certifi==2025.1.31
+certifi==2026.10.19
     # via
+    #   -r requirements_cove.in
     #   requests
     #   sentry-sdk
     #   urllib3
diff --git a/requirements_cove_dokku.txt b/requirements_cove_dokku.txt
index 3d7cfec..cb2ea82 100644
--- a/requirements_cove_dokku.txt
+++ b/requirements_cove_dokku.txt
@@ -26,7 +26,7 @@ btrees==6.1
     #   zodb
 cached-property==2.0.1
     # via -r requirements_cove.txt
-certifi==2025.1.31
+certifi==2026.10.19
     # via
     #   -r requirements_cove.txt
     #   requests