diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5b09341..dcc4d18 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,4 +33,9 @@ jobs:
       - name: Build
         run: opam exec -- dune build @install
       - name: Test
-        run: opam exec -- dune runtest
+        run: BISECT_FILE=`pwd`/bisect opam exec -- dune runtest --force --instrument-with bisect_ppx
+      - name: Upload coverage
+        if: matrix.os == 'ubuntu-latest'
+        run: opam exec -- bisect-ppx-report send-to Coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 316f7fc..eb84997 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,10 @@
 # OCaml Generated Files
-_build
+_build/
+_coverage/
+*.coverage
 
 # MacOS Files
 .DS_Store
 
 # VSCode Files
-.vscode
\ No newline at end of file
+.vscode
diff --git a/README.md b/README.md
index bbc9f90..134526c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Whilloc
+# Whilloc [![Build](https://github.com/formalsec/whilloc/actions/workflows/build.yml/badge.svg)](https://github.com/formalsec/whilloc/actions/workflows/build.yml) [![Coverage Status](https://coveralls.io/repos/github/formalsec/whilloc/badge.svg?branch=HEAD)](https://coveralls.io/github/formalsec/whilloc?branch=HEAD)
 
 A simple "while"-like programming language that includes memory
 allocation support.
diff --git a/bin/dune b/bin/dune
index 041732f..da7ffa5 100644
--- a/bin/dune
+++ b/bin/dune
@@ -6,4 +6,6 @@
  (modules main options dir cmd_execute cmd_test doc_execute doc_test)
  (libraries whilloc cmdliner bos ppx_deriving_yojson.runtime)
  (preprocess
-  (pps ppx_deriving_yojson)))
+  (pps ppx_deriving_yojson))
+ (instrumentation
+  (backend bisect_ppx)))
diff --git a/dune-project b/dune-project
index ee09e88..31e949e 100644
--- a/dune-project
+++ b/dune-project
@@ -25,15 +25,16 @@
  (name whilloc)
  (synopsis "A short synopsis")
  (description "A longer description")
- (depends 
-   ocaml 
-   dune 
-   z3 
-   menhir 
-   bos 
-   cmdliner 
+ (depends
+   ocaml
+   dune
+   z3
+   menhir
+   bos
+   cmdliner
    ppx_deriving_yojson
-   (encoding (= "dev")))
+   (encoding (= "dev"))
+   (bisect_ppx (and :with-test (>= "2.5.0"))))
  (tags
   (topics "to describe" your project)))
 
diff --git a/lib/dune b/lib/dune
index 5a4416f..b14a274 100644
--- a/lib/dune
+++ b/lib/dune
@@ -4,7 +4,9 @@
  (name whilloc)
  (libraries z3 ppx_deriving_yojson.runtime encoding)
  (preprocess
-  (pps ppx_deriving_yojson)))
+  (pps ppx_deriving_yojson))
+ (instrumentation
+  (backend bisect_ppx)))
 
 (ocamllex
  (modules lexer))
diff --git a/whilloc.opam b/whilloc.opam
index 62a271c..b8d9444 100644
--- a/whilloc.opam
+++ b/whilloc.opam
@@ -18,6 +18,7 @@ depends: [
   "cmdliner"
   "ppx_deriving_yojson"
   "encoding" {= "dev"}
+  "bisect_ppx" {with-test & >= "2.5.0"}
   "odoc" {with-doc}
 ]
 build: [