diff --git a/bin/compile b/bin/compile
index db2d838bb..6e30856b0 100755
--- a/bin/compile
+++ b/bin/compile
@@ -269,8 +269,13 @@ mtime "pip.uninstall.time" "${start}"
 # This allows for people to ship a setup.py application to Heroku
 # (which is rare, but I vouch that it should work!)
 
-if [ ! -f requirements.txt ] && [ ! -f Pipfile ]; then
-  echo "-e ." > requirements.txt
+if [ ! -f requirements.txt ] && [ ! -f Pipfile ] ; then
+    if [ -f pyproject.toml ] ; then
+        # Editable installs are not supported for pyproject.toml-style projects.
+        echo "." > requirements.txt
+    else
+        echo "-e ." > requirements.txt
+    fi
 fi
 
 # Fix egg-links.
diff --git a/bin/detect b/bin/detect
index eeb965b0f..682585fc5 100755
--- a/bin/detect
+++ b/bin/detect
@@ -15,7 +15,7 @@
 BUILD_DIR=$1
 
 # Exit early if app is clearly not Python.
-if [ ! -f "$BUILD_DIR/requirements.txt" ] && [ ! -f "$BUILD_DIR/setup.py" ] && [ ! -f "$BUILD_DIR/Pipfile" ]; then
+if [ ! -f "$BUILD_DIR/requirements.txt" ] && [ ! -f "$BUILD_DIR/setup.py" ] && [ ! -f "$BUILD_DIR/Pipfile" ] && [ ! -f "$BUILD_DIR/pyproject.toml" ]; then
   exit 1
 fi
 
diff --git a/test/fixtures/flit-requires/foobar.py b/test/fixtures/flit-requires/foobar.py
new file mode 100644
index 000000000..4b4c67818
--- /dev/null
+++ b/test/fixtures/flit-requires/foobar.py
@@ -0,0 +1,3 @@
+"""An amazing sample package!"""
+
+__version__ = '0.1'
diff --git a/test/fixtures/flit-requires/pyproject.toml b/test/fixtures/flit-requires/pyproject.toml
new file mode 100644
index 000000000..61cc974f1
--- /dev/null
+++ b/test/fixtures/flit-requires/pyproject.toml
@@ -0,0 +1,10 @@
+[build-system]
+requires = ["flit"]
+build-backend = "flit.buildapi"
+
+[tool.flit.metadata]
+module = "foobar"
+author = "Sir Robin"
+author-email = "robin@camelot.uk"
+home-page = "https://github.com/sirrobin/foobar"
+requires = ["attrs >=19.1.0"]
diff --git a/test/fixtures/flit/foobar.py b/test/fixtures/flit/foobar.py
new file mode 100644
index 000000000..4b4c67818
--- /dev/null
+++ b/test/fixtures/flit/foobar.py
@@ -0,0 +1,3 @@
+"""An amazing sample package!"""
+
+__version__ = '0.1'
diff --git a/test/fixtures/flit/pyproject.toml b/test/fixtures/flit/pyproject.toml
new file mode 100644
index 000000000..3dca8c957
--- /dev/null
+++ b/test/fixtures/flit/pyproject.toml
@@ -0,0 +1,9 @@
+[build-system]
+requires = ["flit"]
+build-backend = "flit.buildapi"
+
+[tool.flit.metadata]
+module = "foobar"
+author = "Sir Robin"
+author-email = "robin@camelot.uk"
+home-page = "https://github.com/sirrobin/foobar"
diff --git a/test/fixtures/poetry-lock/foobar.py b/test/fixtures/poetry-lock/foobar.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/poetry-lock/poetry.lock b/test/fixtures/poetry-lock/poetry.lock
new file mode 100644
index 000000000..3eb160325
--- /dev/null
+++ b/test/fixtures/poetry-lock/poetry.lock
@@ -0,0 +1,19 @@
+[[package]]
+category = "main"
+description = "Classes Without Boilerplate"
+name = "attrs"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.1.0"
+
+[package.extras]
+dev = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface", "sphinx", "pre-commit"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface"]
+
+[metadata]
+content-hash = "9c92739040d45f898575877e69198d92bb9477423fe80c60a14376bf1f3d010e"
+python-versions = "^3.7"
+
+[metadata.hashes]
+attrs = ["69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79", "f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"]
diff --git a/test/fixtures/poetry-lock/pyproject.toml b/test/fixtures/poetry-lock/pyproject.toml
new file mode 100644
index 000000000..0a3fd420a
--- /dev/null
+++ b/test/fixtures/poetry-lock/pyproject.toml
@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "foobar"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.6"
+attrs = "^19.1.0"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"
diff --git a/test/fixtures/poetry/foobar.py b/test/fixtures/poetry/foobar.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/fixtures/poetry/pyproject.toml b/test/fixtures/poetry/pyproject.toml
new file mode 100644
index 000000000..4074cf7f7
--- /dev/null
+++ b/test/fixtures/poetry/pyproject.toml
@@ -0,0 +1,14 @@
+[tool.poetry]
+name = "foobar"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.6"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"
diff --git a/test/fixtures/pyproject-toml/pyproject.toml b/test/fixtures/pyproject-toml/pyproject.toml
new file mode 100644
index 000000000..864b334a8
--- /dev/null
+++ b/test/fixtures/pyproject-toml/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta:__legacy__"
diff --git a/test/fixtures/pyproject-toml/setup.py b/test/fixtures/pyproject-toml/setup.py
new file mode 100644
index 000000000..4d986d25d
--- /dev/null
+++ b/test/fixtures/pyproject-toml/setup.py
@@ -0,0 +1,4 @@
+from setuptools import setup
+
+
+setup(name="foobar", version="1.0.0")
diff --git a/test/run-features b/test/run-features
index 66fac4ea7..3c7b168ff 100755
--- a/test/run-features
+++ b/test/run-features
@@ -70,6 +70,31 @@ testPipenvFullVersion() {
   assertCapturedSuccess
 }
 
+testPyProjectToml() {
+    compile "pyproject-toml"
+    assertCapturedSuccess
+}
+
+testPoetry() {
+    compile "poetry"
+    assertCapturedSuccess
+}
+
+testPoetryLock() {
+    compile "poetry-lock"
+    assertCapturedSuccess
+}
+
+testFlit() {
+    compile "flit"
+    assertCapturedSuccess
+}
+
+testFlitRequires() {
+    compile "flit-requires"
+    assertCapturedSuccess
+}
+
 testNoRequirements() {
   compile "no-requirements"
   assertCapturedError