diff --git a/requirements.txt b/requirements.txt
index 3872621..b392e02 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ python-dateutil==2.6.1
 pytz==2017.2
 PyVISA==1.8
 requests==2.20.0
-PyYAML==5.1
+PyYAML==5.4
 sip==4.19.3
 six==1.10.0
 snowballstemmer==1.2.1
diff --git a/requirements_docs.txt b/requirements_docs.txt
index d91ee7a..fb8d005 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -19,7 +19,7 @@ python-dateutil==2.6.1
 pytz==2017.2
 PyVISA==1.8
 requests==2.20.0
-PyYAML==5.1
+PyYAML==5.4
 sip==4.19.3
 six==1.10.0
 snowballstemmer==1.2.1