diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 3a350938ba..d4e65e95ec 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -17,4 +17,4 @@ RUN printf '\n\n' | bash -c "sh <(curl -fsSL https://raw.githubusercontent.com/o
 USER vscode
 ENV HOME=/home/vscode
 
-RUN opam init -y --shell-setup --enable-shell-hook --compiler=5.5.0 --disable-sandboxing
+RUN opam init -y --shell-setup --enable-shell-hook --compiler=5.5.1 --disable-sandboxing
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 313267be4d..c26588ac4b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,14 +37,14 @@ jobs:
       matrix:
         include:
           - os: ubuntu-24.04 # x64
-            ocaml_compiler: ocaml-variants.5.5.0+options,ocaml-option-static
+            ocaml_compiler: ocaml-variants.5.5.1+options,ocaml-option-static
             upload_binaries: true
             upload_libs: true
             node-target: linux-x64
             rust-target: x86_64-unknown-linux-musl
             dune-profile: static
           - os: ubuntu-24.04-arm # ARM
-            ocaml_compiler: ocaml-variants.5.5.0+options,ocaml-option-static
+            ocaml_compiler: ocaml-variants.5.5.1+options,ocaml-option-static
             upload_binaries: true
             # Build the playground compiler and run the benchmarks on the fastest runner
             build_playground: true
@@ -54,19 +54,19 @@ jobs:
             rust-target: aarch64-unknown-linux-musl
             dune-profile: static
           - os: macos-15-intel # x64
-            ocaml_compiler: 5.5.0
+            ocaml_compiler: 5.5.1
             upload_binaries: true
             node-target: darwin-x64
             rust-target: x86_64-apple-darwin
             dune-profile: release
           - os: macos-15 # ARM
-            ocaml_compiler: 5.5.0
+            ocaml_compiler: 5.5.1
             upload_binaries: true
             node-target: darwin-arm64
             rust-target: aarch64-apple-darwin
             dune-profile: release
           - os: windows-2025
-            ocaml_compiler: 5.5.0
+            ocaml_compiler: 5.5.1
             upload_binaries: true
             node-target: win32-x64
             rust-target: x86_64-pc-windows-gnu
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index ae0cb16683..af2f13cbbe 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -21,7 +21,7 @@ jobs:
       id-token: write # For CodeCov OIDC
     env:
       OS: ubuntu-24.04-arm
-      OCAML_COMPILER: 5.5.0
+      OCAML_COMPILER: 5.5.1
       RUST_TARGET: aarch64-unknown-linux-gnu
     steps:
       - name: Checkout
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 08072aa5c0..8f33ed0cd2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -66,9 +66,9 @@ opam init
 
 # Any recent OCaml version works as a development compiler
 # Can also create local switch with opam switch create
-# If you get "No compiler matching `5.5.0' found" error,
+# If you get "No compiler matching `5.5.1' found" error,
 # then you need to run `opam update && opam upgrade` first
-opam switch create 5.5.0
+opam switch create 5.5.1
 
 # Install dev dependencies from OPAM
 opam install . --deps-only --with-test --with-dev-setup -y