diff --git a/pyproject.toml b/pyproject.toml
index c158fcf..dd725e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ httpx = "^0.27.0"
 
 # Optional dependencies for behaviours.
 jasmin-ldap-django = {git = "https://github.com/cedadev/jasmin-ldap-django.git", rev = "2b708c9136f31e8819ffff00fcb95567c27ed659", optional=true}
-python-keycloak = {version = "^3.2.0", optional = true}
+python-keycloak = {version = "^4.2.1", optional = true}
 drf-nested-routers = {version = "^0.94.1", optional = true}
 
 [tool.poetry.extras]