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-rw-r--r--synapse/python_dependencies.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 2de946f464..d58eeeaa74 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -116,6 +116,8 @@ CONDITIONAL_REQUIREMENTS = {
     # hiredis is not a *strict* dependency, but it makes things much faster.
     # (if it is not installed, we fall back to slow code.)
     "redis": ["txredisapi>=1.4.7", "hiredis"],
+    # Required to use experimental `caches.track_memory_usage` config option.
+    "cache_memory": ["pympler"],
 }
 
 ALL_OPTIONAL_REQUIREMENTS = set()  # type: Set[str]