diff --git a/requirements.txt b/requirements.txt
index 5f2fff3..dd1e256 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@
 #     https://github.com/openstack-charmers/release-tools
 #
 # Build requirements
-charm-tools>=2.4.4
+charm-tools>=2.4.4,<2.8
 # importlib-resources 1.1.0 removed Python 3.5 support
 importlib-resources<1.1.0
 simplejson
diff --git a/src/test-requirements.txt b/src/test-requirements.txt
index a4b77a5..fa7c567 100644
--- a/src/test-requirements.txt
+++ b/src/test-requirements.txt
@@ -1,7 +1,7 @@
 # This file is managed centrally.  If you find the need to modify this as a
 # one-off, please don't.  Intead, consult #openstack-charms and ask about
 # requirements management in charms via bot-control.  Thank you.
-charm-tools>=2.4.4
+charm-tools>=2.4.4,<2.8
 coverage>=3.6
 mock>=1.2
 flake8>=2.2.4,<=2.4.1