diff --git a/include/itkCartesianToPolarTransform.h b/include/itkCartesianToPolarTransform.h
index 8dc7377..a4b80e6 100644
--- a/include/itkCartesianToPolarTransform.h
+++ b/include/itkCartesianToPolarTransform.h
@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/include/itkCartesianToPolarTransform.hxx b/include/itkCartesianToPolarTransform.hxx
index e19ca53..951d006 100644
--- a/include/itkCartesianToPolarTransform.hxx
+++ b/include/itkCartesianToPolarTransform.hxx
@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/include/itkPolarToCartesianTransform.h b/include/itkPolarToCartesianTransform.h
index 3718294..4982f37 100644
--- a/include/itkPolarToCartesianTransform.h
+++ b/include/itkPolarToCartesianTransform.h
@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/include/itkPolarToCartesianTransform.hxx b/include/itkPolarToCartesianTransform.hxx
index 0239202..d624641 100644
--- a/include/itkPolarToCartesianTransform.hxx
+++ b/include/itkPolarToCartesianTransform.hxx
@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/test/itkPolarTransformTest.cxx b/test/itkPolarTransformTest.cxx
index 387161a..412277e 100644
--- a/test/itkPolarTransformTest.cxx
+++ b/test/itkPolarTransformTest.cxx
@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,