diff --git a/tools/pinning/pyproject.toml b/tools/pinning/pyproject.toml
index a9eed495a..580922c4e 100644
--- a/tools/pinning/pyproject.toml
+++ b/tools/pinning/pyproject.toml
@@ -51,6 +51,12 @@ awscli = ">=1.19.62"
 # as a dependency here to ensure a version of cython is pinned for extra
 # stability.
 cython = "*"
+# mypy 0.900 stopped including stubs containing type information for 3rd party
+# libraries by default. This breaks our tests so let's continue to pin it back
+# for now. See
+# https://mypy-lang.blogspot.com/2021/05/the-upcoming-switch-to-modular-typeshed.html
+# for more info.
+mypy = "<0.900"
 # We install mock in our "external-mock" tox environment to test that we didn't
 # break Certbot's test API which used to always use mock objects from the 3rd
 # party mock library. We list the mock dependency here so that is pinned, but
diff --git a/tools/requirements.txt b/tools/requirements.txt
index 43d2f5c7b..7190c9c81 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -57,7 +57,7 @@ filelock==3.0.12; python_version >= "3.6" and python_full_version < "3.0.0" or p
 google-api-core==1.30.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 google-api-python-client==2.8.0; python_version >= "3.6"
 google-auth-httplib2==0.1.0; python_version >= "3.6"
-google-auth==1.30.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+google-auth==1.31.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 googleapis-common-protos==1.53.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 html5lib==1.1; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.5.0"
 httplib2==0.19.1; python_version >= "3.6"
@@ -91,7 +91,7 @@ mock==4.0.3; python_version >= "3.6"
 msgpack==1.0.2; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
 msrest==0.6.21; python_version >= "3.6"
 mypy-extensions==0.4.3; python_version >= "3.6"
-mypy==0.901; python_version >= "3.6"
+mypy==0.812; python_version >= "3.5"
 oauth2client==4.1.3; python_version >= "3.6"
 oauthlib==3.1.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
 packaging==20.9; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_full_version >= "3.5.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
@@ -170,7 +170,7 @@ tox==3.23.1; python_version >= "3.6" and python_full_version < "3.0.0" or python
 tqdm==4.61.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
 traitlets==4.3.3
 twine==3.3.0; python_version >= "3.6"
-typed-ast==1.4.3; python_version >= "3.6" and python_version < "3.8" or implementation_name == "cpython" and python_version < "3.8" and python_version >= "3.6"
+typed-ast==1.4.3; python_version >= "3.6" or implementation_name == "cpython" and python_version < "3.8" and python_version >= "3.6"
 typing-extensions==3.10.0.0; python_version >= "3.6"
 uritemplate==3.0.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
 urllib3==1.26.5; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version < "4" and python_version >= "3.6" or python_full_version >= "3.6.0" and python_version < "4" and python_version >= "3.6"