diff --git a/.claude/plugins/plugins.txt b/.claude/plugins/plugins.txt
index 141707e0..e5e7bdd8 100644
--- a/.claude/plugins/plugins.txt
+++ b/.claude/plugins/plugins.txt
@@ -9,12 +9,6 @@ hookify@claude-code-plugins
 feature-dev@claude-code-plugins
 security-guidance@claude-code-plugins
 
-# === Template Plugins (claude-code-templates) ===
-supabase-toolkit@claude-code-templates
-documentation-generator@claude-code-templates
-nextjs-vercel-pro@claude-code-templates
-devops-automation@claude-code-templates
-
 # === Workflow Plugins (claude-code-workflows) ===
 backend-development@claude-code-workflows
 full-stack-orchestration@claude-code-workflows
diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 416edae3..ea9f7f5a 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -76,7 +76,6 @@ COPY --chown=vscode:vscode .claude/commands /home/vscode/.claude/commands
 COPY --chown=vscode:vscode .claude/agents /home/vscode/.claude/agents
 COPY --chown=vscode:vscode .claude/hooks /home/vscode/.claude/hooks
 COPY --chown=vscode:vscode .claude/plugins/plugins.txt /home/vscode/.claude/plugins/plugins.txt
-COPY --chown=vscode:vscode .claude/plugins/known_marketplaces.json /home/vscode/.claude/plugins/known_marketplaces.json
 COPY --chown=vscode:vscode script/install-claude-plugins.sh /tmp/install-claude-plugins.sh
 
 # Install Claude plugins using BuildKit secret
diff --git a/script/install-claude-plugins.sh b/script/install-claude-plugins.sh
index f7c3d210..eeae3085 100755
--- a/script/install-claude-plugins.sh
+++ b/script/install-claude-plugins.sh
@@ -45,17 +45,9 @@ else
 fi
 
 echo "[INFO] マーケットプレイスを初期化中..."
-# known_marketplaces.jsonから必要なマーケットプレイスを追加
-if [[ -f "${CLAUDE_DIR}/plugins/known_marketplaces.json" ]]; then
-    echo "[INFO] known_marketplaces.jsonが見つかりました"
-
-    # 必須マーケットプレイスを追加（正しいコマンド: claude plugin marketplace add）
-    claude plugin marketplace add anthropic/claude-code 2>&1 || echo "[WARN] claude-code-plugins already exists or failed to add"
-    claude plugin marketplace add https://github.com/davila7/claude-code-templates.git 2>&1 || echo "[WARN] claude-code-templates already exists or failed to add"
-    claude plugin marketplace add wshobson/agents 2>&1 || echo "[WARN] claude-code-workflows already exists or failed to add"
-else
-    echo "[WARN] known_marketplaces.jsonが見つかりません"
-fi
+# 必須マーケットプレイスを追加（完全なHTTPS URLを使用）
+claude plugin marketplace add https://github.com/anthropics/claude-code.git 2>&1 || echo "[WARN] claude-code-plugins already exists or failed to add"
+claude plugin marketplace add https://github.com/wshobson/agents.git 2>&1 || echo "[WARN] claude-code-workflows already exists or failed to add"
 
 echo "[INFO] プラグインをインストール中..."
 echo "[DEBUG] Claude version: $(claude --version 2>&1 || echo 'not found')"