diff --git a/pyproject.toml b/pyproject.toml
index 5ee8ff3..6e1c29c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,7 +66,7 @@ requires-python = "<4.0, >=3.10"
 
 # 2: Required dependencies.
 dependencies = [
-	"certbot <4.0, >=3.2.0",
+	"certbot >=3.2.0, <5.0",
 	"dnspython <3.0, >=2.7.0",
 	"gssapi <2.0, >=1.8.0",
 	"humanfriendly <11.0, >=10.0",