diff --git a/requirements.txt b/requirements.txt
index c0f85a26c8..9aa97bc969 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 pandas==2.1.3
 matplotlib>=3.0.0
-pyyaml==5.4
+pyyaml!=6.0.0,!=5.4.0,!=5.4.1  # Not pyyaml==5.4 -- pyyaml is broken with cython 3
 numpy>=1.24.0
 scipy>=1.0.0
 pymongo==3.11.3
@@ -12,4 +12,4 @@ Werkzeug>=2.0.1
 statsmodels==0.14.0
 PyPDF2>=2.5.0
 pyarrow>=14.0.1
-scikit-learn>1.3.0
\ No newline at end of file
+scikit-learn>1.3.0