Mixing Major Versions of IronPDF, IronOCR, and IronBarcode

Curtis Chau

Updated: July 21, 2026

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  # Mixing Major Versions of IronPDF, IronOCR, and IronBarcode A common question is whether you can reference different major versions of Iron Software products in the same project, for example `IronPDF` v2025.x alongside `IronOCR` v2024.x and `IronBarcode` v2023.x. You cannot. Combining different major versions of Iron Software products side by side in a single project is not supported. ## Why It Fails Every Iron Software product is built on a shared internal architecture, and its assemblies and dependencies are version-aligned across the suite. Each product assumes compatibility only with other products of the **same major version**, so mixing versions can surface several problems: - Assembly binding conflicts - Runtime errors - Unexpected behavior The libraries are designed to run together as a suite, not as independently versioned packages. ## Solution Use the same monthly version of every Iron Software library in a project. A correctly aligned set looks like this: ```txt IronPDF v2026.5.x IronOCR v2026.5.x IronBarcode v2026.5.x ``` If your project already pins mismatched versions and you want to align them: 1. **Upgrade through NuGet:** bring every Iron Software library to the same monthly version. 2. **Review the changes first:** check the changelog and any API differences between versions before upgrading, so a version bump doesn't break existing calls. [[t:(Pinning all Iron Software packages to one monthly version, such as 2026.5.x, keeps the suite compatible and avoids binding conflicts down the line.)]]

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A common question is whether you can reference different major versions of Iron Software products in the same project, for example IronPDF v2025.x alongside IronOCR v2024.x and IronBarcode v2023.x. You cannot. Combining different major versions of Iron Software products side by side in a single project is not supported.

Why It Fails

Every Iron Software product is built on a shared internal architecture, and its assemblies and dependencies are version-aligned across the suite. Each product assumes compatibility only with other products of the same major version, so mixing versions can surface several problems:

• Assembly binding conflicts
• Runtime errors
• Unexpected behavior

The libraries are designed to run together as a suite, not as independently versioned packages.

Solution

Use the same monthly version of every Iron Software library in a project. A correctly aligned set looks like this:

IronPDF v2026.5.x
IronOCR v2026.5.x
IronBarcode v2026.5.x

IronPDF v2026.5.x
IronOCR v2026.5.x
IronBarcode v2026.5.x

If your project already pins mismatched versions and you want to align them:

1. Upgrade through NuGet: bring every Iron Software library to the same monthly version.
2. Review the changes first: check the changelog and any API differences between versions before upgrading, so a version bump doesn't break existing calls.

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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