diff --git a/nest_py/lib_src/fst_pipeline/requirements.txt b/nest_py/lib_src/fst_pipeline/requirements.txt
index 028389a..720ac3f 100644
--- a/nest_py/lib_src/fst_pipeline/requirements.txt
+++ b/nest_py/lib_src/fst_pipeline/requirements.txt
@@ -46,5 +46,5 @@ rpy2==2.5.6
 # process of installing biom-format. specifying a specific scipy version here
 # may cause conflicts and build failures
 scipy>=0.13.0
-pyyaml==3.11
+pyyaml==5.4
 xlsxwriter==0.7.2