diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index b4df0b066bcc66b166440c4d1147dc2d2c30dc30..1ebeeaf85ee53870c5f66b3256083351e9938633 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -144,7 +144,7 @@ packages:
     - '@1.0.7'
   iwyu:
     require:
-    - '@0.18'
+    - '@0.20'
   jana2:
     require:
     - '@2.1.1'