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-rw-r--r--pyproject.toml3
1 files changed, 3 insertions, 0 deletions
diff --git a/pyproject.toml b/pyproject.toml
index 19ffdc7b2c..92ea302b75 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -167,6 +167,9 @@ ijson = ">=3.1.4"
 matrix-common = "~=1.1.0"
 # We need packaging.requirements.Requirement, added in 16.1.
 packaging = ">=16.1"
+# At the time of writing, we only use functions from the version `importlib.metadata`
+# which shipped in Python 3.8. This corresponds to version 1.4 of the backport.
+importlib_metadata = { version = ">=1.4", python = "<3.8" }
 
 
 # Optional Dependencies