diff --git a/src/main/paradox/settings.md b/src/main/paradox/settings.md
index cd2a558..cd81572 100644
--- a/src/main/paradox/settings.md
+++ b/src/main/paradox/settings.md
@@ -20,4 +20,10 @@ The different levels of checking available are:
 * `WarnOnError`: a check will be performed after `update`s, and a warning printed if there are any changes.
 * `FailOnError`: a check will be performed after `update`s, and the build will fail if there are any changes.
 * `AutoUpdate`: a check will be performed after `update`s, and the lockfile will be automatically updated if there are
-  any changes.
\ No newline at end of file
+  any changes.
+
+### dependencyLockModuleFilter
+
+* **Description:** Excludes the specified dependencies from the lockfile.
+* **Accepts:** `sbt.librarymanagement.ModuleFilter`
+* **Default:** `DependencyFilter.fnToModuleFilter(_ => false)` (no exclusions)
\ No newline at end of file
diff --git a/src/main/scala/software/purpledragon/sbt/lock/DependencyLockPlugin.scala b/src/main/scala/software/purpledragon/sbt/lock/DependencyLockPlugin.scala
index f1aca8f..5c07c9e 100644
--- a/src/main/scala/software/purpledragon/sbt/lock/DependencyLockPlugin.scala
+++ b/src/main/scala/software/purpledragon/sbt/lock/DependencyLockPlugin.scala
@@ -19,6 +19,7 @@ package software.purpledragon.sbt.lock
 import sbt._
 import sbt.Keys._
 import sbt.internal.util.ManagedLogger
+import sbt.librarymanagement.{DependencyFilter, ModuleFilter}
 import software.purpledragon.sbt.lock.DependencyLockUpdateMode._
 import software.purpledragon.sbt.lock.model.{DependencyLockFile, LockFileMatches}
 import software.purpledragon.sbt.lock.util.MessageUtil
@@ -30,6 +31,7 @@ object DependencyLockPlugin extends AutoPlugin {
     val dependencyLockFile = settingKey[File]("lockfile to generate")
     val dependencyLockWrite = taskKey[File]("write dependencies to lockfile")
     val dependencyLockRead = taskKey[Option[DependencyLockFile]]("read dependencies from lockfile")
+    val dependencyLockModuleFilter = settingKey[ModuleFilter]("exclusion filter for dependencies")
 
     val dependencyLockCheck = taskKey[Unit]("check if dependency lock is up to date")
 
@@ -45,12 +47,12 @@ object DependencyLockPlugin extends AutoPlugin {
 
   override def projectSettings: Seq[Def.Setting[_]] = Seq(
     dependencyLockFile := baseDirectory.value / "build.sbt.lock",
-    dependencyLockAutoCheck := DependencyLockUpdateMode.WarnOnError,
     dependencyLockWrite := {
       val dest = dependencyLockFile.value
       val updateReport = update.value
+      val exclusionFilter = dependencyLockModuleFilter.value
 
-      val lockFile = DependencyUtils.resolve(updateReport, thisProject.value.configurations.map(_.toConfigRef))
+      val lockFile = DependencyUtils.resolve(updateReport, exclusionFilter, thisProject.value.configurations.map(_.toConfigRef))
 
       val updateStatus = DependencyLockIO
         .readLockFile(dest)
@@ -69,9 +71,10 @@ object DependencyLockPlugin extends AutoPlugin {
     dependencyLockCheck := {
       val logger: ManagedLogger = streams.value.log
       val updateReport: UpdateReport = update.value
+      val exclusionFilter = dependencyLockModuleFilter.value
 
       val currentFile = dependencyLockRead.value.getOrElse(sys.error(MessageUtil.formatMessage("lock.status.missing")))
-      val updatedFile = DependencyUtils.resolve(updateReport, thisProject.value.configurations.map(_.toConfigRef))
+      val updatedFile = DependencyUtils.resolve(updateReport, exclusionFilter, thisProject.value.configurations.map(_.toConfigRef))
 
       val changes = currentFile.findChanges(updatedFile)
 
@@ -89,13 +92,14 @@ object DependencyLockPlugin extends AutoPlugin {
       // check to see if the current command/task is one of our internal ones
       val skipCheck = state.value.currentCommand.map(_.commandLine).exists(PluginTasks.contains)
       val checkMode = dependencyLockAutoCheck.value
+      val exclusionFilter = dependencyLockModuleFilter.value
 
       if (checkMode != DependencyLockUpdateMode.CheckDisabled && !skipCheck) {
         logger.debug("Automatically checking lockfile")
 
         dependencyLockRead.value match {
           case Some(currentFile) =>
-            val updatedFile = DependencyUtils.resolve(report, thisProject.value.configurations.map(_.toConfigRef))
+            val updatedFile = DependencyUtils.resolve(report, exclusionFilter, thisProject.value.configurations.map(_.toConfigRef))
 
             val changes = currentFile.findChanges(updatedFile)
 
@@ -129,4 +133,9 @@ object DependencyLockPlugin extends AutoPlugin {
       }
     }.value
   )
+
+  override def globalSettings: Seq[Def.Setting[_]] = Seq(
+    dependencyLockAutoCheck := DependencyLockUpdateMode.WarnOnError,
+    dependencyLockModuleFilter := DependencyFilter.fnToModuleFilter(_ => false)
+  )
 }
diff --git a/src/main/scala/software/purpledragon/sbt/lock/DependencyUtils.scala b/src/main/scala/software/purpledragon/sbt/lock/DependencyUtils.scala
index 00ae5f2..0725615 100644
--- a/src/main/scala/software/purpledragon/sbt/lock/DependencyUtils.scala
+++ b/src/main/scala/software/purpledragon/sbt/lock/DependencyUtils.scala
@@ -19,12 +19,13 @@ package software.purpledragon.sbt.lock
 import java.time.Instant
 
 import sbt._
+import sbt.librarymanagement.ModuleFilter
 import software.purpledragon.sbt.lock.model.{DependencyLockFile, DependencyRef, ResolvedArtifact, ResolvedDependency}
 
 import scala.collection.{immutable, mutable, SortedSet}
 
 object DependencyUtils {
-  def resolve(updateReport: UpdateReport, configs: Seq[ConfigRef]): DependencyLockFile = {
+  def resolve(updateReport: UpdateReport, exclusion: ModuleFilter, configs: Seq[ConfigRef]): DependencyLockFile = {
     val configurations: immutable.Seq[ConfigurationReport] =
       updateReport.configurations.filter(config => configs.contains(config.configuration))
 
@@ -34,7 +35,11 @@ object DependencyUtils {
       configurations.foldLeft(Map.empty[DependencyRef, ResolvedDependency]) { (acc, conf) =>
         val configName = conf.configuration.name
 
-        conf.modules.foldLeft(acc) { (acc2, module) =>
+        val filteredModules = conf.modules.filterNot { moduleReport =>
+          exclusion(moduleReport.module)
+        }
+
+        filteredModules.foldLeft(acc) { (acc2, module) =>
           resolveModuleForConfig(acc2, configName, module, checksumCache)
         }
       }
diff --git a/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt
new file mode 100644
index 0000000..32ada5a
--- /dev/null
+++ b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt
@@ -0,0 +1,9 @@
+scalaVersion := "2.12.10"
+
+libraryDependencies ++= Seq(
+  "org.apache.commons"  %  "commons-lang3"  % "3.9",
+  "org.scalatest"       %% "scalatest"      % "3.0.8"   % Test,
+)
+
+// One ineffective filter and one for commons-lang3.
+dependencyLockModuleFilter := moduleFilter(name = "fake") | moduleFilter(name = "commons-lang3")
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt.lock b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt.lock
new file mode 100644
index 0000000..ff69575
--- /dev/null
+++ b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/build.sbt.lock
@@ -0,0 +1,85 @@
+{
+  "lockVersion" : 1,
+  "timestamp" : "2022-08-11T17:47:26.677327Z",
+  "configurations" : [
+    "compile",
+    "optional",
+    "provided",
+    "runtime",
+    "test"
+  ],
+  "dependencies" : [
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-library",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-library.jar",
+          "hash" : "sha1:3509860bc2e5b3da001ed45aca94ffbe5694dbda"
+        }
+      ],
+      "configurations" : [
+        "test",
+        "compile",
+        "runtime"
+      ]
+    },
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-reflect",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-reflect.jar",
+          "hash" : "sha1:14cb7beb516cd8e07716133668c427792122c926"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang.modules",
+      "name" : "scala-xml_2.12",
+      "version" : "1.2.0",
+      "artifacts" : [
+        {
+          "name" : "scala-xml_2.12.jar",
+          "hash" : "sha1:5d38ac30beb8420dd395c0af447ba412158965e6"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scalactic",
+      "name" : "scalactic_2.12",
+      "version" : "3.0.8",
+      "artifacts" : [
+        {
+          "name" : "scalactic_2.12.jar",
+          "hash" : "sha1:b50559dfc4a691c1089f9c8812e1d6fd17f80277"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scalatest",
+      "name" : "scalatest_2.12",
+      "version" : "3.0.8",
+      "artifacts" : [
+        {
+          "name" : "scalatest_2.12.jar",
+          "hash" : "sha1:8493ffa579676977b810a7a9fdc23af9d3c8af7f"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/build.properties b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/build.properties
new file mode 100644
index 0000000..22af262
--- /dev/null
+++ b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.7.1
diff --git a/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/plugins.sbt b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/plugins.sbt
new file mode 100644
index 0000000..85547d6
--- /dev/null
+++ b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/project/plugins.sbt
@@ -0,0 +1,7 @@
+{
+  val pluginVersion = System.getProperty("plugin.version")
+  if (pluginVersion == null)
+    throw new RuntimeException("""|The system property 'plugin.version' is not defined.
+                                  |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+  else addSbtPlugin("software.purpledragon" % "sbt-dependency-lock" % pluginVersion)
+}
diff --git a/src/sbt-test/dependencyLockCheck/pass-with-exclusion/test b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/test
new file mode 100644
index 0000000..1d6433e
--- /dev/null
+++ b/src/sbt-test/dependencyLockCheck/pass-with-exclusion/test
@@ -0,0 +1 @@
+> dependencyLockCheck
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt
new file mode 100644
index 0000000..9c10975
--- /dev/null
+++ b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt
@@ -0,0 +1,9 @@
+scalaVersion := "2.12.10"
+
+libraryDependencies ++= Seq(
+  "org.apache.commons"  %  "commons-lang3"  % "3.9",
+  "org.scalatest"       %% "scalatest"      % "3.0.8"   % Test,
+)
+
+// One ineffective filter and one for the org.scalatest organization.
+dependencyLockModuleFilter := moduleFilter(organization = "org.fake") | moduleFilter(organization = "org.scalatest")
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock
new file mode 100644
index 0000000..458593a
--- /dev/null
+++ b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock
@@ -0,0 +1,87 @@
+{
+  "lockVersion" : 1,
+  "timestamp" : "2022-08-11T18:02:07.891395Z",
+  "configurations" : [
+    "compile",
+    "optional",
+    "provided",
+    "runtime",
+    "test"
+  ],
+  "dependencies" : [
+    {
+      "org" : "org.apache.commons",
+      "name" : "commons-lang3",
+      "version" : "3.9",
+      "artifacts" : [
+        {
+          "name" : "commons-lang3.jar",
+          "hash" : "sha1:0122c7cee69b53ed4a7681c03d4ee4c0e2765da5"
+        }
+      ],
+      "configurations" : [
+        "compile",
+        "runtime",
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-library",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-library.jar",
+          "hash" : "sha1:3509860bc2e5b3da001ed45aca94ffbe5694dbda"
+        }
+      ],
+      "configurations" : [
+        "compile",
+        "runtime",
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-reflect",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-reflect.jar",
+          "hash" : "sha1:14cb7beb516cd8e07716133668c427792122c926"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang.modules",
+      "name" : "scala-xml_2.12",
+      "version" : "1.2.0",
+      "artifacts" : [
+        {
+          "name" : "scala-xml_2.12.jar",
+          "hash" : "sha1:5d38ac30beb8420dd395c0af447ba412158965e6"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scalactic",
+      "name" : "scalactic_2.12",
+      "version" : "3.0.8",
+      "artifacts" : [
+        {
+          "name" : "scalactic_2.12.jar",
+          "hash" : "sha1:b50559dfc4a691c1089f9c8812e1d6fd17f80277"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock.orig b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock.orig
new file mode 100644
index 0000000..458593a
--- /dev/null
+++ b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/build.sbt.lock.orig
@@ -0,0 +1,87 @@
+{
+  "lockVersion" : 1,
+  "timestamp" : "2022-08-11T18:02:07.891395Z",
+  "configurations" : [
+    "compile",
+    "optional",
+    "provided",
+    "runtime",
+    "test"
+  ],
+  "dependencies" : [
+    {
+      "org" : "org.apache.commons",
+      "name" : "commons-lang3",
+      "version" : "3.9",
+      "artifacts" : [
+        {
+          "name" : "commons-lang3.jar",
+          "hash" : "sha1:0122c7cee69b53ed4a7681c03d4ee4c0e2765da5"
+        }
+      ],
+      "configurations" : [
+        "compile",
+        "runtime",
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-library",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-library.jar",
+          "hash" : "sha1:3509860bc2e5b3da001ed45aca94ffbe5694dbda"
+        }
+      ],
+      "configurations" : [
+        "compile",
+        "runtime",
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang",
+      "name" : "scala-reflect",
+      "version" : "2.12.10",
+      "artifacts" : [
+        {
+          "name" : "scala-reflect.jar",
+          "hash" : "sha1:14cb7beb516cd8e07716133668c427792122c926"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scala-lang.modules",
+      "name" : "scala-xml_2.12",
+      "version" : "1.2.0",
+      "artifacts" : [
+        {
+          "name" : "scala-xml_2.12.jar",
+          "hash" : "sha1:5d38ac30beb8420dd395c0af447ba412158965e6"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    },
+    {
+      "org" : "org.scalactic",
+      "name" : "scalactic_2.12",
+      "version" : "3.0.8",
+      "artifacts" : [
+        {
+          "name" : "scalactic_2.12.jar",
+          "hash" : "sha1:b50559dfc4a691c1089f9c8812e1d6fd17f80277"
+        }
+      ],
+      "configurations" : [
+        "test"
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/project/plugins.sbt b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/project/plugins.sbt
new file mode 100644
index 0000000..85547d6
--- /dev/null
+++ b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/project/plugins.sbt
@@ -0,0 +1,7 @@
+{
+  val pluginVersion = System.getProperty("plugin.version")
+  if (pluginVersion == null)
+    throw new RuntimeException("""|The system property 'plugin.version' is not defined.
+                                  |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+  else addSbtPlugin("software.purpledragon" % "sbt-dependency-lock" % pluginVersion)
+}
diff --git a/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/test b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/test
new file mode 100644
index 0000000..6dce62d
--- /dev/null
+++ b/src/sbt-test/dependencyLockWrite/unchanged-with-exclusion/test
@@ -0,0 +1,3 @@
+> dependencyLockWrite
+$ must-mirror build.sbt.lock build.sbt.lock.orig
+> dependencyLockCheck
\ No newline at end of file