diff --git a/.github/workflows/omjl.yml b/.github/workflows/omjl.yml
new file mode 100644
index 0000000..0834bab
--- /dev/null
+++ b/.github/workflows/omjl.yml
@@ -0,0 +1,27 @@
+name: OM.jl integration
+
+# Tests this package against the other OM.jl packages at the matching branch
+# and runs OM.jl's test suite with it, on Julia 1.13, so that a change
+# here cannot break OM.jl unnoticed. The workflow lives in JKRT/OM.jl:
+# .github/workflows/omjl-ci.yml.
+on:
+  pull_request:
+  push:
+    branches: [master, "1.13"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  actions: write  # julia-actions/cache deletes the caches it replaces
+
+concurrency:
+  group: omjl-${{ github.ref }}
+  # Superseded PR runs only; every push to master/1.13 is tested.
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  omjl:
+    uses: JKRT/OM.jl/.github/workflows/omjl-ci.yml@master
+    with:
+      package: Absyn
+      julia-versions: '["1.13"]'  # OM.jl's packages require Julia 1.13
diff --git a/Project.toml b/Project.toml
index b915fe7..8a8cc9f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,12 +1,16 @@
 name = "Absyn"
 uuid = "ce2f92e2-a952-11e9-0543-8b443f216f1d"
 authors = ["johti <johti17@liu.se>"]
-version = "1.3.4"
+version = "1.3.5"
 [deps]
 ExportAll = "ad2082ca-a69e-11e9-38fa-e96309a31fe4"
 MetaModelica = "9d7f2a79-07b5-5542-8b19-c0100dda6b06"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 
+[compat]
+julia = "1.13"
+MetaModelica = "0.4.2"
+
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 [targets]