diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 00c6e6edb..2ca68ea36 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -34,4 +34,5 @@
 | thomasmelvin        | Thomas Melvin      | Met Office                       | 2026-01-15 |
 | tinyendian          | Wolfgang Hayek     | Earth Sciences New Zealand       | 2026-02-02 |
 | DanStoneMO          | Daniel Stone       | Met Office                       | 2026-02-26 |
-| ericaneininger      | Erica Neininger    | Met Office                       | 2026-03-02 |
\ No newline at end of file
+| ericaneininger      | Erica Neininger    | Met Office                       | 2026-03-02 |
+| theabro             | Nathan Luke Abraham | NCAS & University of Cambridge  | 2026-04-15 |
\ No newline at end of file
diff --git a/dependencies.yaml b/dependencies.yaml
index 9bd6b263a..e22026d06 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -50,5 +50,5 @@ socrates-spectral:
     ref: 2026.03.2
 
 ukca:
-    source: git@github.com:MetOffice/ukca.git
-    ref: 2026.03.2
+    source: git@github.com:theabro/ukca.git
+    ref: um14.1_hetchem_fixes
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 351f034ba..61393e01c 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,                                          &