diff --git a/requirements-dev.txt b/requirements-dev.txt
index 09f05629..670a73ee 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,6 @@
 black==24.1.1
-Sphinx==8.0.0
-sphinx-rtd-theme==3.0.2
+Sphinx==5.0.2
+sphinx-rtd-theme==1.0.0
 sphinx-click==4.0.0
 pyinstaller  # version not pinned due to latest used by release procedure
 pylint==2.17.3
diff --git a/requirements.txt b/requirements.txt
index ca4f94e2..b4f401db 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,4 +16,4 @@ rich==13.6.0
 rich-click==1.5.2
 simplejson==3.17.6
 tzlocal==4.2
-zstandard==0.22.0
+zstandard==0.23.0