diff --git a/README.md b/README.md
index 3226a3b9..2e65f4aa 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,8 @@ typically a few hours ahead of the offline databases, and supports commits;
 however it currently can produce false negatives for some ecosystems.
 
 > While the API supports commits, the detector currently has limited support for
-> extracting them - only the `composer.lock` parser includes commit details
+> extracting them - only the `composer.lock` & `yarn.lock` parsers include
+> commit details
 
 You cannot use the API in `--offline` mode, but you can use both the offline
 databases and the API together; the detector will remove any duplicate results.
diff --git a/pkg/lockfile/fixtures/yarn/commits.v1.lock b/pkg/lockfile/fixtures/yarn/commits.v1.lock
new file mode 100644
index 00000000..092a290f
--- /dev/null
+++ b/pkg/lockfile/fixtures/yarn/commits.v1.lock
@@ -0,0 +1,84 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"mine1@git+ssh://git@github.com:G-Rath/npm-git-repo-2#0a2d2506c1":
+  version "1.0.0-alpha.37"
+  resolved "git+ssh://git@github.com:G-Rath/npm-git-repo-2#0a2d2506c1fe299691fc5db53a2097db3bd615bc"
+  dependencies:
+    mine G-Rath/npm-git-repo-1
+
+mine2@G-Rath/npm-git-repo-2#0a2d2506c1:
+  version "0.0.1"
+  resolved "https://codeload.github.com/G-Rath/npm-git-repo-2/tar.gz/0a2d2506c1fe299691fc5db53a2097db3bd615bc"
+  dependencies:
+    mine G-Rath/npm-git-repo-1
+
+mine3@G-Rath/npm-git-repo-1:
+  version "1.2.3"
+  resolved "https://codeload.github.com/G-Rath/npm-git-repo-1/tar.gz/094e581aaf927d010e4b61d706ba584551dac502"
+
+"mine4@git+ssh://git@github.com:G-Rath/npm-git-repo-2#another-branch", "mine4@git+ssh://git@github.com:G-Rath/npm-git-repo-2#aa3bdfcb":
+  version "0.0.2"
+  resolved "git+ssh://git@github.com:G-Rath/npm-git-repo-2#aa3bdfcb1d845c79f14abb66f60d35b8a3ee5998"
+
+mine4@G-Rath/npm-git-repo-2#another-branch:
+  version "0.0.4"
+  resolved "https://codeload.github.com/G-Rath/npm-git-repo-2/tar.gz/aa3bdfcb1d845c79f14abb66f60d35b8a3ee5998"
+
+"my-package@git+https://git@github.com/my-org/my-package.git#v1.8.3":
+  version "1.8.3"
+  resolved "git+https://git@github.com/my-org/my-package.git#b3bd3f1b3dad036e671251f5258beaae398f983a"
+
+"@bower_components/angular-animate@git://github.com/angular/bower-angular-animate.git#~1.4.0":
+  version "1.4.14"
+  resolved "git://github.com/angular/bower-angular-animate.git#e7f778fc054a086ba3326d898a00fa1bc78650a8"
+
+"@bower_components/alertify@fabien-d/alertify.js-shim#^0.3.10":
+  version "0.0.0"
+  resolved "https://codeload.github.com/fabien-d/alertify.js-shim/tar.gz/e7b6c46d76604d297c389d830817b611c9a8f17c"
+
+minimist@0.0.8, "minimist@ssh://github.com/substack/minimist.git#0.0.8":
+  version "0.0.8"
+  resolved "ssh://github.com/substack/minimist.git#3754568bfd43a841d2d72d7fb54598635aea8fa4"
+
+"bats-assert@https://github.com/bats-core/bats-assert":
+  version "2.0.0"
+  resolved "https://github.com/bats-core/bats-assert#4bdd58d3fbcdce3209033d44d884e87add1d8405"
+
+"bats-support@https://github.com/bats-core/bats-support":
+  version "0.3.0"
+  resolved "https://github.com/bats-core/bats-support#d140a65044b2d6810381935ae7f0c94c7023c8c3"
+
+"bats@https://github.com/bats-core/bats-core#master":
+  version "1.5.0"
+  resolved "https://github.com/bats-core/bats-core#172580d2ce19ee33780b5f1df817bbddced43789"
+
+"vue@https://github.com/vuejs/vue.git#v2.6.12":
+  version "2.6.12"
+  resolved "https://github.com/vuejs/vue.git#bb253db0b3e17124b6d1fe93fbf2db35470a1347"
+
+"kit@git+https://bitbucket.org/kettlelogic/kit.git":
+  version "1.0.0"
+  resolved "git+https://bitbucket.org/kettlelogic/kit.git#5b6830c0252eb73c6024d40a8ff5106d3023a2a6"
+  dependencies:
+    ramda "^0.23.0"
+    source-map-support "^0.4.8"
+
+"casadistance@git+ssh://git@bitbucket.org/casasoftag/casadistance.git":
+  version "1.0.0"
+  resolved "git+ssh://git@bitbucket.org/casasoftag/casadistance.git#f0308391f0c50104182bfb2332a53e4e523a4603"
+
+"babel-preset-php@gitlab:kornelski/babel-preset-php#master":
+  version "1.1.1"
+  resolved "https://gitlab.com/kornelski/babel-preset-php/repository/archive.tar.gz?ref=c5a7ba5e0ad98b8db1cb8ce105403dd4b768cced"
+  dependencies:
+    php-parser "^2.0.6"
+
+"is-number@github:jonschlinkert/is-number#master":
+  version "2.0.0"
+  resolved "https://codeload.github.com/jonschlinkert/is-number/tar.gz/d5ac0584ee9ae7bd9288220a39780f155b9ad4c8"
+
+"is-number@https://dummy-token@github.com/jonschlinkert/is-number.git#master":
+  version "5.0.0"
+  resolved "https://dummy-token@github.com/jonschlinkert/is-number.git#af885e2e890b9ef0875edd2b117305119ee5bdc5"
diff --git a/pkg/lockfile/fixtures/yarn/commits.v2.lock b/pkg/lockfile/fixtures/yarn/commits.v2.lock
new file mode 100644
index 00000000..cae9bc7f
--- /dev/null
+++ b/pkg/lockfile/fixtures/yarn/commits.v2.lock
@@ -0,0 +1,63 @@
+# This file is generated by running "yarn install" inside your project.
+# Manual changes might be lost - proceed with caution!
+
+__metadata:
+  version: 5
+  cacheKey: 8
+
+"@my-scope/my-first-package@my-scope/my-first-package#commit=0b824c650d3a03444dbcf2b27a5f3566f6e41358":
+  version: 0.0.6
+  resolution: "@my-scope/my-first-package@https://github.com/my-org/my-first-package.git#commit=0b824c650d3a03444dbcf2b27a5f3566f6e41358"
+
+"my-second-package@my-org/my-second-package#commit=59e2127b9f9d4fda5f928c4204213b3502cd5bb0":
+  version: 0.2.2
+  resolution: "my-second-package@https://github.com/my-org/my-second-package.git#commit=59e2127b9f9d4fda5f928c4204213b3502cd5bb0"
+  peerDependencies:
+    "@my-scope/my-first-package": "*"
+  checksum: 709b31cf9d0b7deb3ed3d591dbb1f1af3f199fd88c63a93eb02aedacc074902353f5a9776c7895e5fb87a4d72f5218a844bfc4d7422927e11403484c8ba9f4a0
+  languageName: node
+  linkType: hard
+
+"@typegoose/typegoose@https://github.com/typegoose/typegoose.git#main":
+  version: 7.2.0
+  resolution: "@typegoose/typegoose@https://github.com/typegoose/typegoose.git#commit:3ed06e5097ab929f69755676fee419318aaec73a"
+  dependencies:
+    lodash: ^4.17.15
+    loglevel: ^1.6.8
+    reflect-metadata: ^0.1.13
+    semver: ^7.3.2
+    tslib: ^2.0.0
+  peerDependencies:
+    "@types/mongoose": ^5.7.21
+    mongoose: ^5.9.17
+  checksum: f02168420eba060a09b6b3771e17e2ebc224997b5e417e81e0b108128bf4fc5020a1816d15ce2a857ef2a8f33fbb79925a76020e3fc80250b998ad5328458900
+  languageName: node
+  linkType: hard
+
+"vuejs@https://github.com/vuejs/vue.git":
+  version: 2.5.0
+  resolution: "vuejs@https://github.com/vuejs/vue.git#commit=0948d999f2fddf9f90991956493f976273c5da1f"
+  checksum: 34739eba9e89a7368f833e52e8d0219c1adb7f9e63ab52b862534b8cafcee8f70e2053e28fe6065a66d5ea78b6e852347d377dfde85083f2ecf1ea642e7a3ad4
+  languageName: node
+  linkType: hard
+
+# version 4
+"my-third-package@https://github.com/my-org/my-third-package#everything":
+  version: 0.16.1-dev
+  resolution: "my-third-package@https://github.com/my-org/my-third-package.git#commit=5675a0aed98e067ff6ecccc5ac674fe8995960e0"
+
+# version 4
+"my-node-sdk@git+https://github.com/my-org/my-node-sdk.git#v1.1.0":
+  version: 1.1.0
+  resolution: "my-node-sdk@https://github.com/my-org/my-node-sdk.git#commit=053dea9e0b8af442d8f867c8e690d2fb0ceb1bf5"
+  checksum: 0c5f2734e71e8284d97e2c3dd89c366c8e1603b0934006aed6b4a6247f1448033e8a71aff5c67c9b96307b76e911cbac9961d9865f760013c4f0b27e3906f1c4
+  languageName: node
+  linkType: hard
+
+# version 5
+"is-really-great@ssh://git@github.com:my-org/is-really-great.git":
+  version: 1.0.0
+  resolution: "is-really-great@ssh://git@github.com:my-org/is-really-great.git#commit=191eeef50c584714e1fb8927d17ee72b3b8c97c4"
+  checksum: bf868a7451379998b2e2b777ab96e3c13c496f100cb7bf92ce44a425c91c8f1a2d5aed9a77a75bb62a9967c435e51e762b93afcc3f9c4650ca1042f5994756d1
+  languageName: node
+  linkType: hard
diff --git a/pkg/lockfile/helpers_test.go b/pkg/lockfile/helpers_test.go
index 0e8a6c77..b11a228d 100644
--- a/pkg/lockfile/helpers_test.go
+++ b/pkg/lockfile/helpers_test.go
@@ -20,7 +20,13 @@ func expectErrContaining(t *testing.T, err error, str string) {
 }
 
 func packageToString(pkg lockfile.PackageDetails) string {
-	return fmt.Sprintf("%s@%s (%s)", pkg.Name, pkg.Version, pkg.Ecosystem)
+	commit := pkg.Commit
+
+	if commit == "" {
+		commit = "<no commit>"
+	}
+
+	return fmt.Sprintf("%s@%s (%s, %s)", pkg.Name, pkg.Version, pkg.Ecosystem, commit)
 }
 
 func hasPackage(packages []lockfile.PackageDetails, pkg lockfile.PackageDetails) bool {
diff --git a/pkg/lockfile/parse-yarn-lock-v1_test.go b/pkg/lockfile/parse-yarn-lock-v1_test.go
index 8f747d68..f3c6d09b 100644
--- a/pkg/lockfile/parse-yarn-lock-v1_test.go
+++ b/pkg/lockfile/parse-yarn-lock-v1_test.go
@@ -183,3 +183,124 @@ func TestYarnLock_v1_VersionsWithBuildString(t *testing.T) {
 		},
 	})
 }
+
+func TestYarnLock_v1_Commits(t *testing.T) {
+	t.Parallel()
+
+	packages, err := lockfile.ParseYarnLock("fixtures/yarn/commits.v1.lock")
+
+	if err != nil {
+		t.Errorf("Got unexpected error: %v", err)
+	}
+
+	expectPackages(t, packages, []lockfile.PackageDetails{
+		{
+			Name:      "mine1",
+			Version:   "1.0.0-alpha.37",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "0a2d2506c1fe299691fc5db53a2097db3bd615bc",
+		},
+		{
+			Name:      "mine2",
+			Version:   "0.0.1",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "0a2d2506c1fe299691fc5db53a2097db3bd615bc",
+		},
+		{
+			Name:      "mine3",
+			Version:   "1.2.3",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "094e581aaf927d010e4b61d706ba584551dac502",
+		},
+		{
+			Name:      "mine4",
+			Version:   "0.0.2",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "aa3bdfcb1d845c79f14abb66f60d35b8a3ee5998",
+		},
+		{
+			Name:      "mine4",
+			Version:   "0.0.4",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "aa3bdfcb1d845c79f14abb66f60d35b8a3ee5998",
+		},
+		{
+			Name:      "my-package",
+			Version:   "1.8.3",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "b3bd3f1b3dad036e671251f5258beaae398f983a",
+		},
+		{
+			Name:      "@bower_components/angular-animate",
+			Version:   "1.4.14",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "e7f778fc054a086ba3326d898a00fa1bc78650a8",
+		},
+		{
+			Name:      "@bower_components/alertify",
+			Version:   "0.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "e7b6c46d76604d297c389d830817b611c9a8f17c",
+		},
+		{
+			Name:      "minimist",
+			Version:   "0.0.8",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "3754568bfd43a841d2d72d7fb54598635aea8fa4",
+		},
+		{
+			Name:      "bats-assert",
+			Version:   "2.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "4bdd58d3fbcdce3209033d44d884e87add1d8405",
+		},
+		{
+			Name:      "bats-support",
+			Version:   "0.3.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "d140a65044b2d6810381935ae7f0c94c7023c8c3",
+		},
+		{
+			Name:      "bats",
+			Version:   "1.5.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "172580d2ce19ee33780b5f1df817bbddced43789",
+		},
+		{
+			Name:      "vue",
+			Version:   "2.6.12",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "bb253db0b3e17124b6d1fe93fbf2db35470a1347",
+		},
+		{
+			Name:      "kit",
+			Version:   "1.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "5b6830c0252eb73c6024d40a8ff5106d3023a2a6",
+		},
+		{
+			Name:      "casadistance",
+			Version:   "1.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "f0308391f0c50104182bfb2332a53e4e523a4603",
+		},
+		{
+			Name:      "babel-preset-php",
+			Version:   "1.1.1",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "c5a7ba5e0ad98b8db1cb8ce105403dd4b768cced",
+		},
+		{
+			Name:      "is-number",
+			Version:   "2.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "d5ac0584ee9ae7bd9288220a39780f155b9ad4c8",
+		},
+		{
+			Name:      "is-number",
+			Version:   "5.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "af885e2e890b9ef0875edd2b117305119ee5bdc5",
+		},
+	})
+}
diff --git a/pkg/lockfile/parse-yarn-lock-v2_test.go b/pkg/lockfile/parse-yarn-lock-v2_test.go
index 99b8a7b8..1dd13868 100644
--- a/pkg/lockfile/parse-yarn-lock-v2_test.go
+++ b/pkg/lockfile/parse-yarn-lock-v2_test.go
@@ -150,3 +150,58 @@ func TestYarnLock_v2_VersionsWithBuildString(t *testing.T) {
 		},
 	})
 }
+
+func TestYarnLock_v2_Commits(t *testing.T) {
+	t.Parallel()
+
+	packages, err := lockfile.ParseYarnLock("fixtures/yarn/commits.v2.lock")
+
+	if err != nil {
+		t.Errorf("Got unexpected error: %v", err)
+	}
+
+	expectPackages(t, packages, []lockfile.PackageDetails{
+		{
+			Name:      "@my-scope/my-first-package",
+			Version:   "0.0.6",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "0b824c650d3a03444dbcf2b27a5f3566f6e41358",
+		},
+		{
+			Name:      "my-second-package",
+			Version:   "0.2.2",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "59e2127b9f9d4fda5f928c4204213b3502cd5bb0",
+		},
+		{
+			Name:      "@typegoose/typegoose",
+			Version:   "7.2.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "3ed06e5097ab929f69755676fee419318aaec73a",
+		},
+		{
+			Name:      "vuejs",
+			Version:   "2.5.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "0948d999f2fddf9f90991956493f976273c5da1f",
+		},
+		{
+			Name:      "my-third-package",
+			Version:   "0.16.1-dev",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "5675a0aed98e067ff6ecccc5ac674fe8995960e0",
+		},
+		{
+			Name:      "my-node-sdk",
+			Version:   "1.1.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "053dea9e0b8af442d8f867c8e690d2fb0ceb1bf5",
+		},
+		{
+			Name:      "is-really-great",
+			Version:   "1.0.0",
+			Ecosystem: lockfile.YarnEcosystem,
+			Commit:    "191eeef50c584714e1fb8927d17ee72b3b8c97c4",
+		},
+	})
+}
diff --git a/pkg/lockfile/parse-yarn-lock.go b/pkg/lockfile/parse-yarn-lock.go
index 7b690900..93abdc17 100644
--- a/pkg/lockfile/parse-yarn-lock.go
+++ b/pkg/lockfile/parse-yarn-lock.go
@@ -3,6 +3,7 @@ package lockfile
 import (
 	"bufio"
 	"fmt"
+	"net/url"
 	"os"
 	"regexp"
 	"strings"
@@ -76,9 +77,77 @@ func determineYarnPackageVersion(group []string) string {
 	return ""
 }
 
+func determineYarnPackageResolution(group []string) string {
+	re := regexp.MustCompile(`^ {2}(?:resolution:|resolved) "([^ '"]+)"$`)
+
+	for _, s := range group {
+		matched := re.FindStringSubmatch(s)
+
+		if matched != nil {
+			return matched[1]
+		}
+	}
+
+	// todo: decide what to do here - maybe panic...?
+	return ""
+}
+
+func tryExtractCommit(resolution string) string {
+	// language=GoRegExp
+	matchers := []string{
+		// ssh://...
+		// git://...
+		// git+ssh://...
+		// git+https://...
+		`(?:^|.+@)(?:git(?:\+(?:ssh|https))?|ssh)://.+#(\w+)$`,
+		// https://....git/...
+		`(?:^|.+@)https://.+\.git#(\w+)$`,
+		`https://codeload\.github\.com(?:/[\w-.]+){2}/tar\.gz/(\w+)$`,
+		`.+#commit[:=](\w+)$`,
+	}
+
+	for _, matcher := range matchers {
+		re := regexp.MustCompile(matcher)
+		matched := re.FindStringSubmatch(resolution)
+
+		if matched != nil {
+			return matched[1]
+		}
+	}
+
+	u, err := url.Parse(resolution)
+
+	if err == nil {
+		gitRepoHosts := []string{
+			"bitbucket.org",
+			"github.com",
+			"gitlab.com",
+		}
+
+		for _, host := range gitRepoHosts {
+			if u.Host != host {
+				continue
+			}
+
+			if u.RawQuery != "" {
+				queries := u.Query()
+
+				if queries.Has("ref") {
+					return queries.Get("ref")
+				}
+			}
+
+			return u.Fragment
+		}
+	}
+
+	return ""
+}
+
 func parsePackageGroup(group []string) PackageDetails {
 	name := extractYarnPackageName(group[0])
 	version := determineYarnPackageVersion(group)
+	resolution := determineYarnPackageResolution(group)
 
 	if version == "" {
 		_, _ = fmt.Fprintf(
@@ -92,6 +161,7 @@ func parsePackageGroup(group []string) PackageDetails {
 		Name:      name,
 		Version:   version,
 		Ecosystem: YarnEcosystem,
+		Commit:    tryExtractCommit(resolution),
 	}
 }