Pin pydantic to <2.0.0 (#15862)

Signed-off-by: Paarth Shah <mail@shahpaarth.com>
matrix-org · Jul 4, 2023 · 6498486 · 6498486
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diff --git a/changelog.d/15862.bugfix b/changelog.d/15862.bugfix
@@ -0,0 +1,3 @@
+Pin `pydantic` to ^=1.7.4 to avoid backwards-incompatible API changes from the 2.0.0 release.
+Resolves https://github.com/matrix-org/synapse/issues/15858.
+Contributed by @PaarthShah.
diff --git a/poetry.lock b/poetry.lock
diff --git a/pyproject.toml b/pyproject.toml
@@ -207,7 +207,8 @@ packaging = ">=16.1"
 # which shipped in Python 3.8. This corresponds to version 1.4 of the backport.
 importlib_metadata = { version = ">=1.4", python = "<3.8" }
 # This is the most recent version of Pydantic with available on common distros.
-pydantic = ">=1.7.4"
+# We are currently incompatible with >=2.0.0: (https://github.com/matrix-org/synapse/issues/15858)
+pydantic = "^1.7.4"
 
 # This is for building the rust components during "poetry install", which
 # currently ignores the `build-system.requires` directive (c.f.