diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index e1f2b637cdb..07763e8d4c5 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -127,26 +127,26 @@ jobs:
         # 4.02.x and 4.07.x in other environments
         include:
           # OCaml trunk:
-          - ocaml-compiler: ocaml-variants.5.4.0+trunk
+          - ocaml-compiler: ocaml-variants.5.5.0+trunk
             os: ubuntu-latest
           # OCaml 5:
           ## ubuntu (x86)
-          - ocaml-compiler: 5.3.x
+          - ocaml-compiler: 5.4.x
             os: ubuntu-latest
             run_tests: true
           ## macos (Apple Silicon)
-          - ocaml-compiler: 5.3.x
+          - ocaml-compiler: 5.4.x
             os: macos-latest
             run_tests: true
           ## macos (x86)
-          - ocaml-compiler: 5.3.x
+          - ocaml-compiler: 5.4.x
             os: macos-13
           ## MSVC
-          - ocaml-compiler: ocaml-compiler.5.3.0,system-msvc
+          - ocaml-compiler: ocaml-compiler.5.4.0,system-msvc
             os: windows-latest
             run_tests: true
           ## mingw
-          - ocaml-compiler: ocaml-base-compiler.5.3.0,system-mingw
+          - ocaml-compiler: ocaml-base-compiler.5.4.0,system-mingw
             os: windows-latest
             run_tests: true
           # OCaml 4: