diff --git a/functions/assert_supported_bolt_version.pp b/functions/assert_supported_bolt_version.pp
index 5f01fe3e..9063e4d3 100644
--- a/functions/assert_supported_bolt_version.pp
+++ b/functions/assert_supported_bolt_version.pp
@@ -6,7 +6,7 @@
 function peadm::assert_supported_bolt_version (
   # No arguments
 ) >> Struct[{ 'supported' => Boolean }] {
-  $supported_bolt_version = '>= 3.17.0 < 4.0.0'
+  $supported_bolt_version = '>= 3.17.0 < 5.0.0'
   $supported = (peadm::bolt_version() =~ SemVerRange($supported_bolt_version))
 # lint:ignore:strict_indent
   unless $supported {