diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 91a1092..60c303c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,28 +25,30 @@ jobs:
           - 08_ruby
           - 09_forth
           - 10_lua
-          - 11_php
-          - 12_erlang
-          - 13_crystal
-          - 14_scala
-          - 15_csharp
-          - 16_coffeescript
-          - 17_kotlin
-          - 18_java
-          - 19_deno
-          - 20_node
-          - 21_go
-          - 22_bun
-          - 23_fortran
-          - 24_rust
-          - 25_cpp-clang
-          - 26_cpp-gcc
-          - 27_c-clang
-          - 28_c-gcc
-          - 29_nim
-          - 30_pascal
-          - 31_zig
-          - 32_assembly
+          - 11_ocaml
+          - 12_php
+          - 13_erlang
+          - 14_crystal
+          - 15_scala
+          - 16_csharp
+          - 17_coffeescript
+          - 18_kotlin
+          - 19_java
+          - 20_deno
+          - 21_node
+          - 22_go
+          - 23_bun
+          - 24_fortran
+          - 25_rust
+          - 26_cpp-clang
+          - 27_cpp-gcc
+          - 28_c-clang
+          - 29_c-gcc
+          - 30_nim
+          - 31_pascal
+          - 32_zig
+          - 33_assembly
+          - 34_ocaml
     runs-on: ubuntu-latest
     container:
       image: acheronfail/count
diff --git a/Dockerfile b/Dockerfile
index 355247d..506f13c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,8 +5,8 @@ ENV DEBIAN_FRONTEND="noninteractive" TZ="Europe/London"
 RUN apt-get update && apt-get install -y \
   bc build-essential clang curl default-jdk default-jre erlang fp-compiler gdb \
   ghc lldb gforth gfortran git gnu-smalltalk gnucobol3 golang jq kotlin lua5.4 \
-  mono-complete moreutils nasm php ruby scala swi-prolog tar tcl unzip wget \
-  xz-utils \
+  mono-complete moreutils nasm ocaml php ruby scala swi-prolog tar tcl unzip \
+  wget xz-utils \
   && apt-get clean
 RUN curl -fSL https://deb.nodesource.com/setup_lts.x | bash - \
   && apt-get install -y nodejs \
@@ -41,6 +41,6 @@ RUN cd && curl -fSL "$(curl -fSL https://ziglang.org/download/index.json | jq -r
   && rm zig.tar.xz
 ENV PATH="/root/.zig:$PATH"
 
-RUN cargo install max_rss --version 0.4.0
+RUN cargo install max_rss --version 0.4.1
 
 WORKDIR /var/count
diff --git a/count.ml b/count.ml
new file mode 100644
index 0000000..6712f48
--- /dev/null
+++ b/count.ml
@@ -0,0 +1,7 @@
+let () =
+  let target = int_of_string Sys.argv.(1) in
+  let rec loop i =
+    if i < target
+    then loop ((i + 1) lor 1)
+    else Printf.printf "%d\n" i
+  in loop 0
diff --git a/justfile b/justfile
index d146897..e3cf6ca 100644
--- a/justfile
+++ b/justfile
@@ -16,7 +16,7 @@ docker-sh:
 
 # NOTE: there are issues if you try to build this on an arm macbook via rosetta emulation
 # - mono fails to install (https://github.com/mono/mono/issues/21423)
-# - getting erlang version segfaults
+# - running anything with erlang segfaults
 docker-build:
   docker build --progress=plain --platform 'linux/amd64' -t {{tag}} .
 
@@ -320,3 +320,7 @@ build-csharp: (_check "mcs mono") && (_size "count.exe") (_sizet "bytecode")
   mono --version | head -1 >> VERSION
   mcs -o+ ./count.cs
   echo 'mono ./count.exe {{i}}' > CMD
+
+build-ocaml: (_check "ocaml")
+  ocaml --version > VERSION
+  echo 'ocaml ./count.ml {{i}}' > CMD