diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3b72541af4..077fc5e80c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -61,6 +61,11 @@ jobs:
             skip-effects: false
             skip-test: false
             skip-doc: true
+          - os: ubuntu-latest
+            ocaml-compiler: ocaml-variants.5.2.0+trunk
+            skip-effects: false
+            skip-test: false
+            skip-doc: true
 
     runs-on: ${{ matrix.os }}
 
@@ -102,6 +107,14 @@ jobs:
           opam-depext: ${{ !matrix.skip-test }}
           opam-depext-flags: --with-test
 
+      - run: opam pin add ppxlib git+https://github.com/panglesd/ppxlib.git#trunk-support-502 --no-action
+        if: ${{ matrix.ocaml-compiler == 'ocaml-variants.5.2.0+trunk' }}
+
+      - run: opam pin add ocaml-compiler-libs git+https://github.com/art-w/ocaml-compiler-libs.git#ocaml-5.2-trunk --no-action
+        if: ${{ matrix.ocaml-compiler == 'ocaml-variants.5.2.0+trunk' }}
+
+      - run: opam pin add ./ --no-action
+
       - run: opam install . --best-effort
         if: ${{ matrix.skip-test }}