diff --git a/requirements.txt b/requirements.txt
index 607d3da..0f1d1c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ sphinx-rtd-theme==0.4.3
 Pillow>=5.3.0
 PyPDF2==1.26.0
 PyYAML>=4.2b1
-Sphinx==2.3.1
+Sphinx==3.0.4
 sphinxcontrib-websupport==1.1.2
 uvloop==0.12.*; sys_platform != 'win32' and sys_platform != 'cygwin' and sys_platform != 'cli'
 responder==1.3.2
@@ -10,3 +10,7 @@ marshmallow==2.19.5
 sphinxcontrib-openapi==0.5.0
 SQLAlchemy==1.3.8
 six==1.12
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+starlette>=0.13.5 # not directly required, pinned by Snyk to avoid a vulnerability
+uvicorn>=0.11.7 # not directly required, pinned by Snyk to avoid a vulnerability
+websockets>=10.0 # not directly required, pinned by Snyk to avoid a vulnerability