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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot use ddtrace 4.X.X with datadog-lambda 8.121.0","articleBody":"## Expected Behavior\nWhen installing requirements.txt with datadog-lambda 8.121.0 ddtrace it should allow to install ddtrace 4.3.0\n\n## Actual Behavior\nIt gives an error \nERROR: Cannot install -r requirements.txt (line 1) and ddtrace\u003e=4.3.0 because these package versions have conflicting dependencies.\n\n\n## Steps to Reproduce the Problem\n\n  1. create a file called requirements.txt with the following content\n```\ndatadog-lambda\u003e=8.121.0\nddtrace\u003e=4.3.0\n```\n\n  2. create venv\n ```\npython3 -m venv .venv\nsource .venv/bin/activate\n```\n  3.  install requirements\n ```\npip install -r requirements.txt\n ```\n4. See results\n```\nCollecting datadog-lambda\u003e=8.121.0 (from -r requirements.txt (line 1))\n  Downloading datadog_lambda-8.121.0-py3-none-any.whl.metadata (994 bytes)\nCollecting ddtrace\u003e=4.3.0 (from -r requirements.txt (line 2))\n  Downloading ddtrace-4.3.0-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.whl.metadata (3.6 kB)\nCollecting datadog\u003c1.0.0,\u003e=0.51.0 (from datadog-lambda\u003e=8.121.0-\u003e-r requirements.txt (line 1))\n  Using cached datadog-0.52.1-py2.py3-none-any.whl.metadata (10 kB)\nINFO: pip is looking at multiple versions of datadog-lambda to determine which version is compatible with other requirements. This could take a while.\nERROR: Cannot install -r requirements.txt (line 1) and ddtrace\u003e=4.3.0 because these package versions have conflicting dependencies.\n```\n\n## Specifications\n\n  - Datadog Lambda Layer version: N/A\n  - Python version:  3.12.3\n \nIs there a better way to install dependencies to make it working without forcing an install? I've noticed that the project.toml in datadog-lambda should support both version depending on the python version. ","author":{"url":"https://github.com/uittorio","@type":"Person","name":"uittorio"},"datePublished":"2026-01-29T08:16:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/713/datadog-lambda-python/issues/713"}