requirements: pin protobuf "<4" also in "req..-hw.txt"

related: 52b73880f9 https://github.com/spesmilo/electrum/issues/7922
2 years ago · 5f83538f05
1 changed files with 4 additions and 0 deletions
--- a/contrib/requirements/requirements-hw.txt
+++ b/contrib/requirements/requirements-hw.txt
@ -11,3 +11,7 @@ ckcc-protocol>=0.7.7
 bitbox02>=6.0.0
 cbor>=1.0.0,<2.0.0
 pyserial>=3.5.0,<4.0.0
+
+# prefer older protobuf (see #7922)
+# (pulled in via e.g. keepkey and bitbox02)
+protobuf>=3.12,<4