The Dewey Decimal Classification 2026 print-on-demand version is now available

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The print version of the Dewey Decimal Classification® (DDC®) system is updated annually to reflect changes to the DDC and provides comprehensive coverage across topics.

What’s new for 2026?

• Streamlined Manual instructions on the use of T1—068 Management; not unlike the previous year’s update to T1—025, many things are called “management”, and we’ve provided guidance on when it’s appropriate to add the standard subdivision.
• A new development for Orthodox Christian liturgy, paralleling those for Roman Catholic and Anglican churches.
• Revised, updated coverage of naval ships and astronautics.
• Updated and expanded numbers for the history of the Arabian Peninsula, both in the context of general history and of early Islam.

Did you know?

• The DDC is the world’s most widely used way to organize library collections and is regularly updated to reflect the modern world across any topic in multiple languages.
• The DDC is available in print and electronic (WebDewey®) formats. 
• You can find regular Dewey® Services updates on the Dewey Services board in the OCLC Community Center. And if you have a current OCLC product subscription, you can sign up for board notifications and comment on posts by signing in to the Community Center with your WorldShare credentials.
• 2026 marks the 150th anniversary of the DDC!