diff --git a/.github/workflows/ci.ml b/.github/workflows/ci.ml
index f4cb0b54169..55808f635b1 100644
--- a/.github/workflows/ci.ml
+++ b/.github/workflows/ci.ml
@@ -324,7 +324,7 @@ let main_build_job ~analyse_job ~cygwin_job ?section runner start_version ~oc ~w
          ~cond:(Predicate(true, EndsWith("matrix.host", "-pc-windows")))
          ~withs:[ ("name", Literal ["opam-exe-${{ matrix.host }}-${{ matrix.ocamlv }}-${{ matrix.build }}"]);
                   ("path", Literal ["D:\\Local\\bin\\opam.exe"; "D:\\Local\\bin\\opam-installer.exe"; "D:\\Local\\bin\\opam-putenv.exe"]) ]
-         "actions/upload-artifact@v3")
+         "actions/upload-artifact@v4")
     ++ only_on Windows (run "Test (basic - Cygwin)" ~cond:(Predicate(true, EndsWith("matrix.host", "-pc-cygwin"))) ["bash -exu .github/scripts/main/test.sh"])
     ++ only_on Windows (run "Test (basic - native Windows)" ~env:[("OPAMROOT", {|D:\a\opam\opam\.opam|})] ~shell:"cmd" ~cond:(Predicate(false, EndsWith("matrix.host", "-pc-cygwin")))
          ({|set Path=D:\Cache\ocaml-local\bin;%Path%|} ::
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b5ef1461449..4d7d9624140 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -193,7 +193,7 @@ jobs:
       run: ldd ./opam.exe | test "$(grep -v -F /cygdrive/c/Windows/)" = ''
     - name: Upload opam binaries for Windows
       if: endsWith(matrix.host, '-pc-windows')
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: opam-exe-${{ matrix.host }}-${{ matrix.ocamlv }}-${{ matrix.build }}
         path: |
diff --git a/master_changes.md b/master_changes.md
index a0347477cbd..3d0a0e96851 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -121,6 +121,7 @@ users)
   * Use actions/cache instead of our own fork ocaml-opam/cache [#6081 @rjbou]
   * Update action cache to v4 [#6081 @rjbou]
   * Update action checkout to v4 [#6081 @rjbou]
+  * Update action upload-artifact to v4 [#6081 @rjbou]
 
 ## Doc