diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index e666f48493..3332a38024 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -39,3 +39,4 @@
 | DrTVockerodtMO      | Terence Vockerodt  | Met Office                       | 2026-01-08 |
 | MetBenjaminWent     | Benjamin Went      | Met Office                       | 2026-01-15 |
 | mo-rickywong        | Ricky Wong         | Met Office                       | 2026-24-02 |
+| theabro             | Nathan Luke Abraham | NCAS & University of Cambridge  | 2026-04-15 |
diff --git a/dependencies.yaml b/dependencies.yaml
index 65df290fa8..1a7aa4be9a 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -51,4 +51,4 @@ socrates-spectral:
 
 ukca:
     source: git@github.com:MetOffice/ukca.git
-    ref: 2026.03.2
+    ref: 1cdb9c26d286260d670a8c7b0c8af685ae3c95ac
diff --git a/interfaces/physics_schemes_interface/source/support/um_ukca_init_mod.f90 b/interfaces/physics_schemes_interface/source/support/um_ukca_init_mod.f90
index 351f034ba8..61393e01c3 100644
--- a/interfaces/physics_schemes_interface/source/support/um_ukca_init_mod.f90
+++ b/interfaces/physics_schemes_interface/source/support/um_ukca_init_mod.f90
@@ -1057,6 +1057,7 @@ subroutine ukca_init( row_length, rows, model_levels, bl_levels,             &
            proc_bl_tracer_mix = bl_tracer_mix,                                 &
            ! UKCA temporary logicals
            l_fix_ukca_hygroscopicities=.false.,                                &
+           l_fix_ukca_n2o5_h2o=.false.,                                        &
            l_fix_ukca_water_content=.true.,                                    &
            ! Return status information
            error_message=ukca_errmsg,                                          &