1 files changed, 2 insertions, 1 deletions

diff --git a/pyproject.toml b/pyproject.toml

index 5537d4a0f7..df59fa0562 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -141,7 +141,8 @@ pyasn1 = ">=0.1.9"
 pyasn1-modules = ">=0.0.7"
 bcrypt = ">=3.1.7"
 Pillow = ">=5.4.0"
-sortedcontainers = ">=1.4.4"
+# We use SortedDict.peekitem(), which was added in sortedcontainers 1.5.2.
+sortedcontainers = ">=1.5.2"
 pymacaroons = ">=0.13.0"
 msgpack = ">=0.5.2"
 phonenumbers = ">=8.2.0"