diff --git a/sip/sip-009-analysis-cost-assessment.md b/sip/sip-008-analysis-cost-assessment.md
similarity index 99%
rename from sip/sip-009-analysis-cost-assessment.md
rename to sip/sip-008-analysis-cost-assessment.md
index 2a028ee12..d2c3ce055 100644
--- a/sip/sip-009-analysis-cost-assessment.md
+++ b/sip/sip-008-analysis-cost-assessment.md
@@ -1,4 +1,4 @@
-# SIP 009 Clarity Parsing and Analysis Cost Assessment
+# SIP 008 Clarity Parsing and Analysis Cost Assessment
 
 ## Preamble