diff --git a/requirements.txt b/requirements.txt
index 0fee074..2ec3f95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # Molecule AI workspace runtime — shared infrastructure
-molecule-ai-workspace-runtime>=0.1.19
+molecule-ai-workspace-runtime>=0.1.21
 
 # Claude Code adapter specific deps
 # Claude Agent SDK — programmatic API to Claude Code engine.