diff --git a/Schemas/mapfile_requirements.txt b/Schemas/mapfile_requirements.txt
index 4818cc541..aa4d4d066 100644
--- a/Schemas/mapfile_requirements.txt
+++ b/Schemas/mapfile_requirements.txt
@@ -1 +1 @@
-pyyaml
\ No newline at end of file
+pyyaml==6.0.2
diff --git a/Schemas/rga_requirements.txt b/Schemas/rga_requirements.txt
index 3feabebde..af6467bc9 100644
--- a/Schemas/rga_requirements.txt
+++ b/Schemas/rga_requirements.txt
@@ -1 +1,2 @@
-validators
\ No newline at end of file
+validators
+pyyaml==6.0.2