diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 36d621f928dc5315b9953972eed6969ac502a500..73264981c81909b12deed9f92a8d06456bed7179 100644
--- a/spack-environment/dev/spack.yaml
+++ b/spack-environment/dev/spack.yaml
@@ -35,7 +35,7 @@ spack:
     - irt@1.0.6
     - jana2@2.1.0 -ipo +podio +root +zmq
     - lcov@1.15
-    - lhapdf@6.5.4 +python
+    - lhapdf@6.5.1 +python
     - madx@5.08.01
     - mesa@22.1.2 +glx -llvm +opengl +opengles +osmesa
     - nlohmann-json@3.11.2