diff --git a/README.rst b/README.rst
index b30bce8549..e71a00f59b 100644
--- a/README.rst
+++ b/README.rst
@@ -1,6 +1,14 @@
 Lemur
 =====
 
+.. warning::
+
+   This repository is now archived and read-only as of July 6, 2026.
+
+   No new pull requests, issues, or contributions will be accepted. Existing content will remain available and publicly accessible, but this repository is no longer actively maintained. If you need to continue making changes, please fork this repository.
+
+   Thank you to everyone who has contributed over the years.
+
 .. image:: https://badges.gitter.im/Join%20Chat.svg
    :alt: Join the chat at https://gitter.im/Netflix/lemur
    :target: https://gitter.im/Netflix/lemur?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
diff --git a/requirements-dev.txt b/requirements-dev.txt
index ad46577308..ccea2979c4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -145,7 +145,7 @@ configobj==5.0.9
     #   certbot
 coverage==7.15.0
     # via -r requirements-tests.txt
-cryptography==48.0.1
+cryptography==46.0.7
     # via
     #   -r requirements-tests.txt
     #   acme
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 83537db57d..10623c68dc 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -158,7 +158,7 @@ configobj==5.0.9
     #   certbot
 coverage==7.15.0
     # via -r requirements-tests.txt
-cryptography==48.0.1
+cryptography==46.0.7
     # via
     #   -r requirements-docs.in
     #   -r requirements-tests.txt
diff --git a/requirements-tests.txt b/requirements-tests.txt
index 1bbea0de98..dbbdbace90 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -133,7 +133,7 @@ configobj==5.0.9
     #   certbot
 coverage==7.15.0
     # via -r requirements-tests.in
-cryptography==48.0.1
+cryptography==46.0.7
     # via
     #   -r requirements.txt
     #   acme
diff --git a/requirements.txt b/requirements.txt
index ebf326c4a2..0e6af48d26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -78,7 +78,7 @@ configargparse==1.7.5
     # via certbot
 configobj==5.0.9
     # via certbot
-cryptography==48.0.1
+cryptography==46.0.7
     # via
     #   -r requirements.in
     #   acme