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-rw-r--r--changelog.d/13785.doc1
-rw-r--r--docs/development/dependencies.md27
2 files changed, 28 insertions, 0 deletions
diff --git a/changelog.d/13785.doc b/changelog.d/13785.doc
new file mode 100644
index 0000000000..6d4eb7eb99
--- /dev/null
+++ b/changelog.d/13785.doc
@@ -0,0 +1 @@
+Add docs for common fix of deleting the `matrix_synapse.egg-info/` directory for fixing Python dependency problems.
diff --git a/docs/development/dependencies.md b/docs/development/dependencies.md
index b356870f27..8474525480 100644
--- a/docs/development/dependencies.md
+++ b/docs/development/dependencies.md
@@ -126,6 +126,23 @@ context of poetry's venv, without having to run `poetry shell` beforehand.
 poetry install --extras all --remove-untracked
 ```
 
+## ...delete everything and start over from scratch?
+
+```shell
+# Stop the current virtualenv if active
+$ deactivate
+
+# Remove all of the files from the current environment.
+# Don't worry, even though it says "all", this will only
+# remove the Poetry virtualenvs for the current project.
+$ poetry env remove --all
+
+# Reactivate Poetry shell to create the virtualenv again
+$ poetry shell
+# Install everything again
+$ poetry install --extras all
+```
+
 ## ...run a command in the `poetry` virtualenv?
 
 Use `poetry run cmd args` when you need the python virtualenv context.
@@ -256,6 +273,16 @@ from PyPI. (This is what makes poetry seem slow when doing the first
 `poetry install`.) Try `poetry cache list` and `poetry cache clear --all
 <name of cache>` to see if that fixes things.
 
+## Remove outdated egg-info
+
+Delete the `matrix_synapse.egg-info/` directory from the root of your Synapse
+install.
+
+This stores some cached information about dependencies and often conflicts with
+letting Poetry do the right thing.
+
+
+
 ## Try `--verbose` or `--dry-run` arguments.
 
 Sometimes useful to see what poetry's internal logic is.