diff --git a/fixtures/dual/package.json b/fixtures/dual/package.json
new file mode 100644
index 0000000..ca23709
--- /dev/null
+++ b/fixtures/dual/package.json
@@ -0,0 +1,25 @@
+{
+  "dependencies": {
+    "gulp-sourcemaps": "2.0.0",
+    "prismjs": "1.0.0",
+    "svgstore": "^3.0.0",
+    "html-webpack-plugin": "4.0.0-alpha.2",
+    "noty": "3.1.0",
+    "jpeg-buffer-orientation": "0.0.0",
+    "styled-components": "2.5.0-1",
+    "@babel/preset-env": "7.0.0",
+    "updates": "https://github.com/silverwind/updates/tarball/6941e05",
+    "ipaddr.js": "https://github.com/silverwind/ipaddr.js/tarball/ipv6_cidrs_take2",
+    "react": "18.0"
+  },
+  "devDependencies": {
+    "updates": "file:."
+  },
+  "peerDependencies": {
+    "@babel/preset-env": "~6.0.0",
+    "svgstore": "^1.0.0 || ^2.0.0"
+  },
+  "resolutions": {
+    "versions/updates": "^1.0.0"
+  }
+}
diff --git a/fixtures/pyproject.toml b/fixtures/dual/pyproject.toml
similarity index 100%
rename from fixtures/pyproject.toml
rename to fixtures/dual/pyproject.toml
diff --git a/fixtures/poetry/pyproject.toml b/fixtures/poetry/pyproject.toml
new file mode 100644
index 0000000..714e2ac
--- /dev/null
+++ b/fixtures/poetry/pyproject.toml
@@ -0,0 +1,12 @@
+[tool.poetry]
+name = ""
+version = "0.0.0"
+description = ""
+authors = []
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.group.dev.dependencies]
+djlint = "1.30.0"
+PyYAML = "6.0"
diff --git a/snapshots/updates.test.js.snap b/snapshots/updates.test.js.snap
index b4a3079..32fc145 100644
--- a/snapshots/updates.test.js.snap
+++ b/snapshots/updates.test.js.snap
@@ -1,5 +1,114 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
+exports[`dual 1`] = `
+{
+  "npm": {
+    "dependencies": {
+      "@babel/preset-env": {
+        "age": "3 years",
+        "info": "https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env",
+        "new": "7.11.5",
+        "old": "7.0.0",
+      },
+      "gulp-sourcemaps": {
+        "age": "4 years",
+        "info": "https://github.com/gulp-sourcemaps/gulp-sourcemaps",
+        "new": "2.6.5",
+        "old": "2.0.0",
+      },
+      "html-webpack-plugin": {
+        "age": "3 years",
+        "info": "https://github.com/jantimon/html-webpack-plugin",
+        "new": "4.0.0-beta.11",
+        "old": "4.0.0-alpha.2",
+      },
+      "jpeg-buffer-orientation": {
+        "age": "3 years",
+        "info": "https://github.com/fisker/jpeg-buffer-orientation",
+        "new": "2.0.3",
+        "old": "0.0.0",
+      },
+      "noty": {
+        "age": "5 years",
+        "info": "https://github.com/needim/noty",
+        "new": "3.2.0-beta",
+        "old": "3.1.0",
+      },
+      "prismjs": {
+        "age": "4 years",
+        "info": "https://github.com/LeaVerou/prism",
+        "new": "1.17.1",
+        "old": "1.0.0",
+      },
+      "react": {
+        "age": "1 year",
+        "info": "https://github.com/facebook/react/tree/HEAD/packages/react",
+        "new": "18.2.0",
+        "old": "18.0",
+      },
+      "styled-components": {
+        "age": "3 years",
+        "info": "https://github.com/styled-components/styled-components",
+        "new": "5.0.0-rc.2",
+        "old": "2.5.0-1",
+      },
+      "svgstore": {
+        "age": "4 years",
+        "info": "https://github.com/svgstore/svgstore",
+        "new": "^3.0.0-2",
+        "old": "^3.0.0",
+      },
+      "updates": {
+        "age": "3 years",
+        "info": "https://github.com/silverwind/updates",
+        "new": "537ccb7",
+        "old": "6941e05",
+      },
+    },
+    "peerDependencies": {
+      "@babel/preset-env": {
+        "age": "3 years",
+        "info": "https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env",
+        "new": "~7.11.5",
+        "old": "~6.0.0",
+      },
+    },
+    "resolutions": {
+      "versions/updates": {
+        "age": "3 years",
+        "info": "https://github.com/silverwind/updates",
+        "new": "^10.0.0",
+        "old": "^1.0.0",
+      },
+    },
+  },
+  "pypi": {
+    "dependencies": {
+      "updates": {
+        "age": "3 years",
+        "info": "https://github.com/silverwind/updates",
+        "new": "537ccb7",
+        "old": "6941e05",
+      },
+    },
+    "tool.poetry.group.dev.dependencies": {
+      "PyYAML": {
+        "age": "1 year",
+        "info": "https://github.com/yaml/pyyaml",
+        "new": "6.0",
+        "old": "6.0",
+      },
+      "djlint": {
+        "age": "2 months",
+        "info": "https://github.com/Riverside-Healthcare/djlint",
+        "new": "1.31.0",
+        "old": "1.30.0",
+      },
+    },
+  },
+}
+`;
+
 exports[`exclude 1`] = `
 {
   "npm": {
diff --git a/updates.test.js b/updates.test.js
index 98e5b2c..a481bca 100644
--- a/updates.test.js
+++ b/updates.test.js
@@ -9,6 +9,9 @@ import {env} from "node:process";
 
 const testFile = fileURLToPath(new URL("fixtures/npm-test/package.json", import.meta.url));
 const emptyFile = fileURLToPath(new URL("fixtures/npm-empty/package.json", import.meta.url));
+const poetryFile = fileURLToPath(new URL("fixtures/poetry/pyproject.toml", import.meta.url));
+const dualFile = fileURLToPath(new URL("fixtures/dual", import.meta.url));
+
 const testPkg = JSON.parse(readFileSync(testFile, "utf8"));
 const testDir = mkdtempSync(join(tmpdir(), "updates-"));
 const script = fileURLToPath(new URL("updates.js", import.meta.url));
@@ -174,7 +177,5 @@ test("exclude", makeTest("-j -e gulp-sourcemaps,prismjs,svgstore,html-webpack-pl
 test("exclude", makeTest("-j -e gulp-sourcemaps -i /react/"));
 test("exclude", makeTest("-j -i gulp*"));
 test("exclude", makeTest("-j -i /^gulp/ -P gulp*"));
-
-test("pypi", makeTest(
-  `-j -f ${fileURLToPath(new URL("fixtures/pyproject.toml", import.meta.url))}`,
-));
+test("pypi", makeTest(`-j -f ${poetryFile}`));
+test("dual", makeTest(`-j -f ${dualFile}`));