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-rw-r--r--pyproject.toml2
1 files changed, 1 insertions, 1 deletions
diff --git a/pyproject.toml b/pyproject.toml
index d8a2887..cefe78b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ packages = [
python = "^3.6"
requests-toolbelt = {version="^0.9.1", optional=true}
requests = {version="^2.23.0", optional=true}
-idna = {version="^2.1", optional=true}
+idna = {version=">=2.1,<4.0", optional=true}
cryptography = {version=">=2.6,<4.0", optional=true}
trio = {version=">=0.14,<0.20", optional=true}
curio = {version="^1.2", optional=true}