diff --git a/test/env.yaml b/test/env.yaml
index 9422e3aa..cfe2246e 100644
--- a/test/env.yaml
+++ b/test/env.yaml
@@ -17,7 +17,7 @@ dependencies:
   - pytest-mpi
   - pip
   - pip:
-    - pyyaml-include
+    - pyyaml-include==1.3.2
     - h5py --no-binary=h5py
     - adc64format>=0.0.2
     - pylandau