diff --git a/external_plugins/slack/.claude-plugin/plugin.json b/external_plugins/slack/.claude-plugin/plugin.json
index 0cfb22ca..d75d4982 100644
--- a/external_plugins/slack/.claude-plugin/plugin.json
+++ b/external_plugins/slack/.claude-plugin/plugin.json
@@ -1,5 +1,6 @@
 {
   "name": "slack",
+  "version": "1.0.0",
   "description": "Slack workspace integration. Search messages, access channels, read threads, and stay connected with your team's communications while coding. Find relevant discussions and context quickly.",
   "author": {
     "name": "Slack"
diff --git a/plugins/example-plugin/.claude-plugin/plugin.json b/plugins/example-plugin/.claude-plugin/plugin.json
index 732639ca..04068e8b 100644
--- a/plugins/example-plugin/.claude-plugin/plugin.json
+++ b/plugins/example-plugin/.claude-plugin/plugin.json
@@ -1,5 +1,6 @@
 {
   "name": "example-plugin",
+  "version": "1.0.0",
   "description": "A comprehensive example plugin demonstrating all Claude Code extension options including commands, agents, skills, hooks, and MCP servers",
   "author": {
     "name": "Anthropic",
diff --git a/plugins/math-olympiad/.claude-plugin/plugin.json b/plugins/math-olympiad/.claude-plugin/plugin.json
index 5638d635..91d2a504 100644
--- a/plugins/math-olympiad/.claude-plugin/plugin.json
+++ b/plugins/math-olympiad/.claude-plugin/plugin.json
@@ -1,5 +1,6 @@
 {
   "name": "math-olympiad",
+  "version": "1.0.0",
   "description": "Solve competition math (IMO, Putnam, USAMO) with adversarial verification that catches what self-verification misses. Fresh-context verifiers attack proofs with specific failure patterns. Calibrated abstention over bluffing.",
   "author": {
     "name": "Anthropic",