Japan has been methodically building out its cybersecurity regulatory framework over the past several years, with increasing emphasis on software supply chain security. While much of the global conversation focuses on US and EU regulations, Japan's approach deserves attention—particularly for organizations that operate in or sell to the Japanese market.
The country's cybersecurity strategy sits at the intersection of national security concerns, industrial policy, and a genuine push to modernize government and critical infrastructure IT. For software supply chain security specifically, Japan is moving quickly from guidelines to operational requirements.
The Regulatory Landscape
Cybersecurity Strategy (2021)
Japan's national Cybersecurity Strategy, updated in September 2021, established the overarching policy direction. The strategy explicitly identifies supply chain risk as a top-tier concern and calls for:
- Enhanced security requirements for government procurement
- Supply chain risk assessment frameworks
- International cooperation on cybersecurity standards
- Promotion of "security by design" in software development
The strategy is coordinated through the National center of Incident readiness and Strategy for Cybersecurity (NISC), which serves as Japan's primary cybersecurity policy body.
METI's Software Supply Chain Guidelines
The Ministry of Economy, Trade and Industry (METI) has been the primary driver of software supply chain security policy. In 2023, METI released guidelines for software supply chain security management that address:
- SBOM adoption — METI has been running SBOM pilot programs with major Japanese manufacturers and software companies, testing practical implementation across different industry sectors
- Vulnerability management — establishing expectations for how organizations track and remediate vulnerabilities in software components
- Supplier risk assessment — frameworks for evaluating the security practices of software suppliers and vendors
- Incident response coordination — how supply chain incidents should be communicated between suppliers and customers
SBOM Pilot Programs
Japan's approach to SBOMs has been notably pragmatic. Rather than mandating SBOM adoption from the top down, METI conducted extensive pilot programs with companies across automotive, electronics, healthcare, and telecommunications sectors.
These pilots focused on practical challenges:
- Which SBOM format works best for different use cases (CycloneDX vs. SPDX)
- How to handle SBOMs for embedded systems with proprietary components
- What level of dependency depth is practical to maintain
- How to integrate SBOM generation into existing development workflows
The findings from these pilots have directly informed METI's policy recommendations, resulting in guidance that's more operationally grounded than some of the mandate-first approaches seen elsewhere.
Critical Infrastructure Protection
Japan designates 14 critical infrastructure sectors, including telecommunications, finance, transportation, and government services. The Critical Infrastructure Protection Basic Policy requires operators in these sectors to implement cybersecurity measures, including:
- Risk assessment of ICT systems and services
- Security requirements for procured software and systems
- Incident reporting to sector-specific regulators
- Regular security audits and assessments
The 2023 update to these requirements added explicit language about software supply chain risk, requiring critical infrastructure operators to consider the security of software components and dependencies in their risk assessments.
The Automotive Sector
Japan's automotive industry—a massive global force—has been particularly active on software supply chain security. With the rise of connected and autonomous vehicles, the software component of vehicles has exploded, and with it, the attack surface.
The Japan Automobile Manufacturers Association (JAMA) has developed industry guidelines that include:
- SBOM requirements for automotive software
- Vulnerability management processes aligned with ISO/SAE 21434
- Supply chain security requirements flowing down to tier-2 and tier-3 suppliers
- Integration with UNECE WP.29 cybersecurity regulations
For software vendors selling into the Japanese automotive supply chain, these requirements are becoming non-negotiable. The industry expects SBOMs, vulnerability tracking, and documented secure development practices.
International Alignment
Japan has been actively working to align its cybersecurity framework with international standards and partner nations. Key efforts include:
- US-Japan cooperation — Japan and the US have established joint working groups on cybersecurity, including supply chain security. Japan's SBOM approach draws heavily from US work, particularly NTIA's SBOM minimum elements
- EU coordination — alignment with the EU Cyber Resilience Act's approach to software security requirements
- ASEAN engagement — Japan has been promoting cybersecurity capacity building across Southeast Asian nations, including supply chain security practices
- ISO alignment — Japanese guidelines reference ISO 27001, ISO 27036 (supply chain security), and ISO/IEC 5230 (open source license compliance)
Enforcement and Compliance
Japan's regulatory approach has traditionally been more guidance-oriented than enforcement-heavy compared to the US or EU. However, this is shifting. Recent developments include:
- Stronger procurement requirements for government IT systems, including supply chain security attestation
- Industry-specific regulations with compliance requirements (particularly in financial services and telecommunications)
- Increased use of public-private partnerships to drive adoption rather than purely regulatory mandates
For foreign companies selling software in Japan, the practical impact is growing. Government procurement increasingly requires demonstrated supply chain security practices, and large Japanese enterprises are flowing similar requirements down to their suppliers.
What This Means for Software Vendors
If you sell software to Japanese organizations—particularly in critical infrastructure, automotive, or government sectors—here's what to focus on:
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SBOM readiness. Generate and maintain SBOMs for your products. Japanese buyers increasingly expect this, and government procurement may require it.
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Vulnerability management. Demonstrate a mature vulnerability management process, including monitoring for new vulnerabilities in your dependencies and a clear remediation workflow.
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Standards alignment. Map your security practices to ISO 27001 and relevant sector-specific standards. Japanese organizations value standards compliance.
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Documentation. Maintain clear documentation of your secure development practices, dependency management, and incident response processes.
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Communication readiness. Be prepared to share security information with Japanese customers and regulators in a timely manner, particularly during supply chain incidents.
How Safeguard.sh Helps
Safeguard.sh helps organizations meet Japan's evolving software supply chain security requirements with automated SBOM generation in both CycloneDX and SPDX formats—critical for alignment with METI guidelines and automotive industry standards. The platform provides continuous vulnerability monitoring across your entire dependency tree, generates compliance documentation that maps to ISO standards, and delivers the transparency Japanese customers and regulators increasingly demand. Whether you're selling into Japan's government sector or automotive supply chain, Safeguard.sh gives you the evidence base to demonstrate mature supply chain security practices.