diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6a49865f..ae21ec69 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -39,7 +39,7 @@ jobs:
         uses: avsm/setup-ocaml@v1
         with:
           # Version of the OCaml compiler to initialise
-          ocaml-version: 4.12.0
+          ocaml-version: 4.11.0
 
       - name: Install dependencies
         run: |
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 27c7e0b1..23fed0ab 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -92,6 +92,9 @@ You can look at the
 [online OCaml documentation](https://catala-lang.org/ocaml_docs/) for the
 different modules' interfaces as well as high-level architecture documentation.
 
+Please note that the `ocamlformat` version the this project use is `0.17.0`.
+Using another version may cause spurious diffs to appear in your pull requests.
+
 ## Internationalization
 
 The Catala language should be adapted to any legislative text that follows a
diff --git a/Makefile b/Makefile
index fdabf5ba..e810a5fc 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ dependencies-ocaml:
 		ocamlformat ANSITerminal sedlex	menhir menhirLib dune cmdliner obelisk \
 		re obelisk unionfind bindlib zarith zarith_stubs_js ocamlgraph \
 		js_of_ocaml-compiler js_of_ocaml js_of_ocaml-ppx calendar camomile \
-		visitors benchmark ocamlformat=0.17.0
+		visitors benchmark ocamlformat
 
 init-submodules:
 	git submodule update --init