diff --git a/test_requirements.txt b/test_requirements.txt
index b913e395..f7c78810 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,2 +1,2 @@
-pytest==3.4.2
-cryptography==2.1.4
+pytest==6.2.4
+cryptography==3.4.7
diff --git a/tox.ini b/tox.ini
index a72f0c6b..34f77afd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,5 +7,5 @@ commands= py.test {toxinidir}/test/
 
 [testenv:lint]
 basepython=python3.4
-deps = flake8==3.5.0
+deps = flake8==3.9.2
 commands = flake8 --max-complexity 10 src/certitude test