PyYAML needs updating for current Python
diff --git a/server/requirements.txt b/server/requirements.txt
index a9ad6f3..7642068 100644
--- a/server/requirements.txt
+++ b/server/requirements.txt
@@ -1,5 +1,5 @@
# Items in this file must have a licence compatible with AL 2.0
-PyYAML~=5.4.1 # WTFPL
+PyYAML~=6.0.1 # MIT
types-PyYAML # AL2.0
multipart~=0.2.1 # MIT
elasticsearch-dsl>=7.0.0,<8.0.0 # AL2.0
diff --git a/tools/requirements.txt b/tools/requirements.txt
index 7a70f22..9aedca9 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -1,5 +1,5 @@
# Items in this file must have a licence compatible with AL 2.0
-PyYAML~=5.4.1 # WTFPL
+PyYAML~=6.0.1 # MIT
# elasticsearch-dsl>=7.0.0,<8.0.0 # AL2.0 - not used by tools currently
# N.B. ES 7.14 introduces strict server version compatibility checks
elasticsearch[async]>=7.13.1,<7.14.0 # AL2.0
