From ce50f049eb560e0c42d70e39f601275c2d5e575b Mon Sep 17 00:00:00 2001
From: Albert Zeyer <albzey@gmail.com>
Date: Thu, 10 Nov 2022 21:54:40 +0100
Subject: [PATCH] CI, use older protobuf for older TF

Fix #1209
---
 .github/workflows/main.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fa73ec60d5..4be2d93c2a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -285,6 +285,9 @@ jobs:
             # Older TF needs older NumPy version.
             # https://github.com/rwth-i6/returnn/pull/1160#issuecomment-1284537803
             pip install --user numpy==1.19.5
+            # Older TF needs also older protobuf version.
+            # https://github.com/rwth-i6/returnn/issues/1209
+            pip install --user protobuf==3.20.1
           fi
         fi
         pip install --user -r requirements.txt | cat