1 files changed, 4 insertions, 3 deletions
diff --git a/tox.ini b/tox.ini
index df473bd234..6329ba286a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -113,14 +113,14 @@ commands =
 [testenv:packaging]
 skip_install=True
 deps =
-    check-manifest
+    check-manifest==0.41
 commands =
     check-manifest
 
 [testenv:check_codestyle]
 skip_install = True
 deps =
-    flake8
+    flake8==3.8.3
     flake8-comprehensions
     # We pin so that our tests don't start failing on new releases of black.
     black==19.10b0
@@ -138,7 +138,8 @@ commands = /bin/sh -c "isort -c --df --sp setup.cfg synapse tests scripts-dev sc
 skip_install = True
 deps = towncrier>=18.6.0rc1
 commands =
-   python -m towncrier.check --compare-with=origin/develop
+   python -m towncrier.check --compare-with=origin/dinsic
+basepython = python3.6
 
 [testenv:check-sampleconfig]
 commands = {toxinidir}/scripts-dev/generate_sample_config --check