diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5d769f1..084ecc5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,10 +13,15 @@ jobs:
     env:
       CC: clang
       CXX: clang++
+      BUNDLE_GEMFILE: ${{ github.workspace }}/implementations/json_schemer/Gemfile
     steps:
       - uses: actions/checkout@v4
       - name: Install uv
         run: pipx install uv
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.2.5'
+          bundler-cache: true
 
       - run: make
       - run: cat dist/report.csv
diff --git a/Makefile b/Makefile
index 86b778f..33308fc 100644
--- a/Makefile
+++ b/Makefile
@@ -61,3 +61,13 @@ dist/results/boon/%: \
 	| dist/results/boon
 	cargo run --manifest-path implementations/boon/Cargo.toml --release $(dir $(word 3,$^)) > $@
 
+# JSON_SCHEMER
+
+dist/results/json_schemer/%: \
+	implementations/json_schemer/main.rb \
+	implementations/json_schemer/Gemfile.lock \
+	schemas/%/schema.json \
+	schemas/%/instances.jsonl \
+	| dist/results/json_schemer
+	bundle exec --gemfile implementations/json_schemer/Gemfile ruby implementations/json_schemer/main.rb schemas/example $(dir $(word 3,$^)) > $@
+
diff --git a/implementations/json_schemer/Gemfile b/implementations/json_schemer/Gemfile
new file mode 100644
index 0000000..f696c62
--- /dev/null
+++ b/implementations/json_schemer/Gemfile
@@ -0,0 +1,4 @@
+source "https://rubygems.org"
+
+gem 'json_schemer'
+gem 'json'
diff --git a/implementations/json_schemer/Gemfile.lock b/implementations/json_schemer/Gemfile.lock
new file mode 100644
index 0000000..cc48f78
--- /dev/null
+++ b/implementations/json_schemer/Gemfile.lock
@@ -0,0 +1,23 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    bigdecimal (3.1.8)
+    hana (1.3.7)
+    json (2.7.2)
+    json_schemer (2.3.0)
+      bigdecimal
+      hana (~> 1.3)
+      regexp_parser (~> 2.0)
+      simpleidn (~> 0.2)
+    regexp_parser (2.9.2)
+    simpleidn (0.2.3)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  json
+  json_schemer
+
+BUNDLED WITH
+   2.4.19
diff --git a/implementations/json_schemer/main.rb b/implementations/json_schemer/main.rb
new file mode 100644
index 0000000..7e82e81
--- /dev/null
+++ b/implementations/json_schemer/main.rb
@@ -0,0 +1,22 @@
+require 'json_schemer'
+require 'json'
+
+path = ARGV[0]
+
+# Load the schema and build a validator
+schema = JSON.parse(File.read(File.join(path, "schema.json")))
+schemer = JSONSchemer.schema(schema)
+
+# Read all instances into an array
+instances = File.open(File.join(path, "instances.jsonl")).map do |line|
+  JSON.parse(line)
+end
+
+# Run the validation
+start_time = Process.clock_gettime(Process::CLOCK_REALTIME, :nanosecond)
+instances.each do |instance|
+  if !schemer.valid?(instance) then exit! end
+end
+end_time = Process.clock_gettime(Process::CLOCK_REALTIME, :nanosecond)
+
+puts end_time - start_time
diff --git a/implementations/json_schemer/version.sh b/implementations/json_schemer/version.sh
new file mode 100755
index 0000000..3e49f99
--- /dev/null
+++ b/implementations/json_schemer/version.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+# Extract the version of the package (json_schemer) from Gemfile.lock
+json_schemer_version=$(grep -Po '(?<=json_schemer \().*(?=\))' implementations/json_schemer/Gemfile.lock)
+
+# Output the version
+echo "$json_schemer_version"