diff --git a/lib/DependencyResolver.ts b/lib/DependencyResolver.ts
index efd1f65..ad90035 100644
--- a/lib/DependencyResolver.ts
+++ b/lib/DependencyResolver.ts
@@ -269,7 +269,7 @@ export class DependencyResolver {
         const edgeAttributes = graph.graph.getEdgeAttributes(edge)
         this._store?.addRequirement(
           new Requirement()
-            .withSource(RequirementSource.Dependency)
+            .withSource(edgeAttributes[Requirement.PROPERTY_SOURCE])
             .withSourceModule(edgeAttributes[Requirement.PROPERTY_SOURCE_MODULE])
             .withTargetModule(targetModule)
             .withDependencyRange(edgeAttributes[Requirement.PROPERTY_DEPENDENCY_RANGE])
diff --git a/lib/Requirement.ts b/lib/Requirement.ts
index 7c1ff44..111b4f4 100644
--- a/lib/Requirement.ts
+++ b/lib/Requirement.ts
@@ -114,13 +114,13 @@ export class Requirement implements Attributes {
    */
   public isValid(): boolean {
     if (this.source === RequirementSource.Dependency && !this.sourceModule) {
-      throw `Requirement has no source module`
+      throw `Requirement has no source module. ${JSON.stringify(this)}`
     }
     if (!this.targetModule) {
-      throw `Requirement has no target module`
+      throw `Requirement has no target module. ${JSON.stringify(this)}`
     }
     if (!this.dependencyRange) {
-      throw `Requirement has no dependency range`
+      throw `Requirement has no dependency range. ${JSON.stringify(this)}`
     }
     return true
   }
diff --git a/test/dependency.resolver.test.ts b/test/dependency.resolver.test.ts
index b5f684c..75551b3 100644
--- a/test/dependency.resolver.test.ts
+++ b/test/dependency.resolver.test.ts
@@ -38,6 +38,12 @@ describe('The dependency resolver', function () {
         ],
       },
     })
+    sb.get('/v3/releases/test-defaultdependency-1.2.4').setResponseBody({
+      slug: 'test-defaultdependency',
+      metadata: {
+        dependencies: [],
+      },
+    })
     sb.get('/v3/releases/test-defaultdependency-1.2.5').setResponseBody({
       slug: 'test-defaultdependency',
       metadata: {
@@ -45,7 +51,7 @@ describe('The dependency resolver', function () {
       },
     })
     sb.get('/v3/releases/test-wrongdepa-1.2.3').setResponseBody({
-      slug: 'test-defaultdependency',
+      slug: 'test-wrongdepa',
       metadata: {
         dependencies: [
           {
@@ -56,7 +62,7 @@ describe('The dependency resolver', function () {
       },
     })
     sb.get('/v3/releases/test-wrongdepb-1.2.3').setResponseBody({
-      slug: 'test-defaultdependency',
+      slug: 'test-wrongdepb',
       metadata: {
         dependencies: [
           {
@@ -67,13 +73,13 @@ describe('The dependency resolver', function () {
       },
     })
     sb.get('/v3/releases/test-wrongdepc-1.2.2').setResponseBody({
-      slug: 'test-defaultdependency',
+      slug: 'test-wrongdepc',
       metadata: {
         dependencies: [],
       },
     })
     sb.get('/v3/releases/test-wrongdepc-1.2.3').setResponseBody({
-      slug: 'test-defaultdependency',
+      slug: 'test-wrongdepc',
       metadata: {
         dependencies: [],
       },
@@ -95,6 +101,9 @@ describe('The dependency resolver', function () {
     sb.get('/v3/modules/test-defaultdependency').setResponseBody({
       slug: 'test-defaultdependency',
       releases: [
+        {
+          version: '1.2.4',
+        },
         {
           version: '1.2.5',
         },
@@ -191,7 +200,7 @@ mod 'test-dependency', '1.2.4'
     expect(subject.modules[0].version).toEqual('1.2.3')
     expect(subject.dependentModules).toHaveLength(1)
     expect(subject.dependentModules[0].getSlug()).toEqual('test-defaultdependency')
-    expect(subject.dependentModules[0].version).toEqual('1.2.5')
+    expect(subject.dependentModules[0].version).toEqual('1.2.4')
   })
 
   it('should create a valid puppetfile when a dependency is in the Puppetfile', async () => {
@@ -231,7 +240,7 @@ mod 'test-dependency', '1.2.4'
     expect(subject.modules).toHaveLength(0)
     expect(subject.dependentModules).toHaveLength(1)
     expect(subject.dependentModules[0].getSlug()).toEqual('test-defaultdependency')
-    expect(subject.dependentModules[0].version).toEqual('1.2.5')
+    expect(subject.dependentModules[0].version).toEqual('1.2.4')
   })
 
   it('should throw on invalid dependencies', async () => {
@@ -335,4 +344,19 @@ mod 'test-wrongdepc', '1.2.3'
 
     await expect(subject.resolve()).resolves.toBeInstanceOf(PuppetFile)
   })
+
+  it('should not throw when downgrading a module that has the Puppetfile as its source', async () => {
+    await expect(
+      new DependencyResolver()
+        .withPuppetFile(
+          await new PuppetFile().fromText(`
+forge 'http://localhost:${sb.getPort()}'
+
+mod 'test-default', '1.2.3'
+mod 'test-defaultdependency', '1.2.5'
+          `)
+        )
+        .resolve()
+    ).resolves.toBeInstanceOf(PuppetFile)
+  })
 })