diff --git a/doc-requirements.txt b/doc-requirements.txt
index 9d00def..d03b717 100644
--- a/doc-requirements.txt
+++ b/doc-requirements.txt
@@ -1,4 +1,4 @@
 sphinx>=1.3
 sphinxcontrib-napoleon>=0.4.3
-mock
+mock==4.0.3
 sphinx_rtd_theme
diff --git a/test-requirements.txt b/test-requirements.txt
index 9955dec..a3737d7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,2 +1,2 @@
-pytest
+pytest==6.2.4
 pytest-cov