diff --git a/resources/install.rb b/resources/install.rb
index 7f88cd8..5e8f01a 100644
--- a/resources/install.rb
+++ b/resources/install.rb
@@ -38,7 +38,7 @@ def pyversion(binary)
 
 action :install do
   converge_if_changed :version, :pip_version do
-    valid_name_regex = /^python3\.?\d?$/
+    valid_name_regex = /^python3\.?(\d+)?$/
     if new_resource.source == 'portable_pypy3'
       package 'bzip2'