diff --git a/src/PHPSemVerChecker/Analyzer/ClassAnalyzer.php b/src/PHPSemVerChecker/Analyzer/ClassAnalyzer.php
index e21d0c0..7c5a0fe 100644
--- a/src/PHPSemVerChecker/Analyzer/ClassAnalyzer.php
+++ b/src/PHPSemVerChecker/Analyzer/ClassAnalyzer.php
@@ -67,7 +67,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($classBefore != $classAfter) {
 				// Check for case change of class name.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($classBefore->name !== $classAfter->name) {
+				if ($classBefore->name->toString() !== $classAfter->name->toString()) {
 					$report->add(
 						$this->context,
 						new ClassCaseChanged(
diff --git a/src/PHPSemVerChecker/Analyzer/ClassMethodAnalyzer.php b/src/PHPSemVerChecker/Analyzer/ClassMethodAnalyzer.php
index 86a766d..f1f8973 100644
--- a/src/PHPSemVerChecker/Analyzer/ClassMethodAnalyzer.php
+++ b/src/PHPSemVerChecker/Analyzer/ClassMethodAnalyzer.php
@@ -18,6 +18,9 @@
 use PHPSemVerChecker\Operation\ClassMethodParameterTypingAdded;
 use PHPSemVerChecker\Operation\ClassMethodParameterTypingRemoved;
 use PHPSemVerChecker\Operation\ClassMethodRemoved;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeAdded;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeChanged;
+use PHPSemVerChecker\Operation\ClassMethodReturnTypeRemoved;
 use PHPSemVerChecker\Report\Report;
 
 class ClassMethodAnalyzer
@@ -109,6 +112,31 @@ public function analyze(Stmt $contextBefore, Stmt $contextAfter)
 					);
 				}
 
+				if ($methodBefore->returnType !== $methodAfter->returnType) {
+					$class = null;
+					if ($methodBefore->returnType !== null && $methodAfter->returnType === null) {
+						$class = ClassMethodReturnTypeAdded::class;
+					} elseif ($methodAfter->returnType !== null && $methodBefore->returnType === null) {
+						$class = ClassMethodReturnTypeRemoved::class;
+					} elseif (strcasecmp($methodAfter->returnType->name, $methodBefore->returnType->name) !== 0) {
+						$class = ClassMethodReturnTypeChanged::class;
+					}
+					if ($class) {
+						$report->add(
+							$this->context,
+							new $class(
+								$this->context,
+								$this->fileBefore,
+								$contextAfter,
+								$methodBefore,
+								$this->fileAfter,
+								$contextAfter,
+								$methodAfter
+							)
+						);
+					}
+				}
+
 				$signatureResult = Signature::analyze($methodBefore->getParams(), $methodAfter->getParams());
 
 				$changes = [
diff --git a/src/PHPSemVerChecker/Analyzer/FunctionAnalyzer.php b/src/PHPSemVerChecker/Analyzer/FunctionAnalyzer.php
index 3d8fc60..0712dbb 100644
--- a/src/PHPSemVerChecker/Analyzer/FunctionAnalyzer.php
+++ b/src/PHPSemVerChecker/Analyzer/FunctionAnalyzer.php
@@ -18,6 +18,9 @@
 use PHPSemVerChecker\Operation\FunctionParameterTypingAdded;
 use PHPSemVerChecker\Operation\FunctionParameterTypingRemoved;
 use PHPSemVerChecker\Operation\FunctionRemoved;
+use PHPSemVerChecker\Operation\FunctionReturnTypeAdded;
+use PHPSemVerChecker\Operation\FunctionReturnTypeChanged;
+use PHPSemVerChecker\Operation\FunctionReturnTypeRemoved;
 use PHPSemVerChecker\Registry\Registry;
 use PHPSemVerChecker\Report\Report;
 
@@ -89,6 +92,30 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 					);
 				}
 
+				if ($functionBefore->returnType !== $functionAfter->returnType) {
+					print_r($functionBefore->returnType);
+					print_r($functionAfter->returnType);
+					$class = null;
+					if ($functionBefore->returnType !== null && $functionAfter->returnType === null) {
+						$class = FunctionReturnTypeAdded::class;
+					} elseif ($functionAfter->returnType !== null && $functionBefore->returnType === null) {
+						$class = FunctionReturnTypeRemoved::class;
+					} elseif (strcasecmp($functionAfter->returnType->name, $functionBefore->returnType->name) !== 0) {
+						$class = FunctionReturnTypeChanged::class;
+					}
+					if ($class) {
+						$report->add(
+							$this->context,
+							new $class(
+								$fileBefore,
+								$functionBefore,
+								$fileAfter,
+								$functionAfter
+							)
+						);
+					}
+				}
+
 				$signatureResult = Signature::analyze($functionBefore->getParams(), $functionAfter->getParams());
 
 				$changes = [
diff --git a/src/PHPSemVerChecker/Analyzer/InterfaceAnalyzer.php b/src/PHPSemVerChecker/Analyzer/InterfaceAnalyzer.php
index a83248b..e7e68c2 100644
--- a/src/PHPSemVerChecker/Analyzer/InterfaceAnalyzer.php
+++ b/src/PHPSemVerChecker/Analyzer/InterfaceAnalyzer.php
@@ -67,7 +67,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($interfaceBefore != $interfaceAfter) {
 				// Check if the name of the interface has changed case.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($interfaceBefore->name !== $interfaceAfter->name) {
+				if ($interfaceBefore->name->toString() !== $interfaceAfter->name->toString()) {
 					$report->add(
 						'interface',
 						new InterfaceCaseChanged(
diff --git a/src/PHPSemVerChecker/Analyzer/TraitAnalyzer.php b/src/PHPSemVerChecker/Analyzer/TraitAnalyzer.php
index b81e53d..6f54a31 100644
--- a/src/PHPSemVerChecker/Analyzer/TraitAnalyzer.php
+++ b/src/PHPSemVerChecker/Analyzer/TraitAnalyzer.php
@@ -65,7 +65,7 @@ public function analyze(Registry $registryBefore, Registry $registryAfter)
 			if ($traitBefore != $traitAfter) {
 				// Check for name case change.
 				// If we entered this section then the normalized names (lowercase) were equal.
-				if ($traitBefore->name !== $traitAfter->name) {
+				if ($traitBefore->name->toString() !== $traitAfter->name->toString()) {
 					$report->add(
 						$this->context,
 						new TraitCaseChanged(
diff --git a/src/PHPSemVerChecker/Configuration/LevelMapping.php b/src/PHPSemVerChecker/Configuration/LevelMapping.php
index 5bd98ad..b8572f1 100644
--- a/src/PHPSemVerChecker/Configuration/LevelMapping.php
+++ b/src/PHPSemVerChecker/Configuration/LevelMapping.php
@@ -135,6 +135,18 @@ class LevelMapping
 		'V158' => Level::PATCH,
 		'V159' => Level::PATCH,
 		'V160' => Level::PATCH,
+		'V161' => Level::PATCH,
+		'V162' => Level::PATCH,
+		'V163' => Level::PATCH,
+		'V164' => Level::PATCH,
+		'V165' => Level::PATCH,
+		'V166' => Level::PATCH,
+		'V167' => Level::PATCH,
+		'V168' => Level::PATCH,
+		'V169' => Level::PATCH,
+		'V170' => Level::PATCH,
+		'V171' => Level::PATCH,
+		'V172' => Level::PATCH,
 	];
 
 	/**
diff --git a/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeAdded.php b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeAdded.php
new file mode 100644
index 0000000..e4b45de
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeAdded.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeAdded extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V161'],
+		'interface' => ['V162'],
+		'trait'     => ['V163'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type was added.';
+}
diff --git a/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeChanged.php b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeChanged.php
new file mode 100644
index 0000000..57d1800
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeChanged.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeChanged extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V167'],
+		'interface' => ['V168'],
+		'trait'     => ['V169'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type was changed.';
+}
diff --git a/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeRemoved.php b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeRemoved.php
new file mode 100644
index 0000000..e321cdc
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/ClassMethodReturnTypeRemoved.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class ClassMethodReturnTypeRemoved extends ClassMethodOperationDelta
+{
+	/**
+	 * @var array
+	 */
+	protected $code = [
+		'class'     => ['V164'],
+		'interface' => ['V165'],
+		'trait'     => ['V166'],
+	];
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Method return type was removed.';
+}
diff --git a/src/PHPSemVerChecker/Operation/FunctionReturnTypeAdded.php b/src/PHPSemVerChecker/Operation/FunctionReturnTypeAdded.php
new file mode 100644
index 0000000..767555e
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/FunctionReturnTypeAdded.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class FunctionReturnTypeAdded extends FunctionOperationDelta
+{
+	/**
+	 * @var string
+	 */
+	protected $code = 'V170';
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Function return type was added.';
+}
diff --git a/src/PHPSemVerChecker/Operation/FunctionReturnTypeChanged.php b/src/PHPSemVerChecker/Operation/FunctionReturnTypeChanged.php
new file mode 100644
index 0000000..6c9420e
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/FunctionReturnTypeChanged.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class FunctionReturnTypeChanged extends FunctionOperationDelta
+{
+	/**
+	 * @var string
+	 */
+	protected $code = 'V171';
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Function return type was changed.';
+}
diff --git a/src/PHPSemVerChecker/Operation/FunctionReturnTypeRemoved.php b/src/PHPSemVerChecker/Operation/FunctionReturnTypeRemoved.php
new file mode 100644
index 0000000..7bbf010
--- /dev/null
+++ b/src/PHPSemVerChecker/Operation/FunctionReturnTypeRemoved.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace PHPSemVerChecker\Operation;
+
+class FunctionReturnTypeRemoved extends FunctionOperationDelta
+{
+	/**
+	 * @var string
+	 */
+	protected $code = 'V172';
+	/**
+	 * @var string
+	 */
+	protected $reason = 'Function return type removed.';
+}