diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index cfce7ff56..f84e78707 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -43,7 +43,7 @@ Pull Requests
 Code Style
 ----------
 - [Black](https://github.com/psf/black) is required
-- Type hints should pass using the current [mypy](http://mypy-lang.org/) release
+- Type hints should pass using the current [mypy](https://mypy-lang.org/) release
 - There are a handful of project-specific styles that should be used:
   - `ae` for an ApplicationEntity object
   - `acse` for the ACSE object
diff --git a/README.rst b/README.rst
index 522343879..927f77367 100644
--- a/README.rst
+++ b/README.rst
@@ -24,7 +24,7 @@
 pynetdicom
 ==========
 
-A Python implementation of the `DICOM <http://dicom.nema.org>`_
+A Python implementation of the `DICOM <https://www.dicomstandard.org>`_
 networking protocol, originally based on (legacy)
 `pynetdicom <https://github.com/patmun/pynetdicom_legacy>`_.
 
@@ -32,8 +32,8 @@ networking protocol, originally based on (legacy)
 Description
 -----------
 
-`DICOM <http://dicom.nema.org>`_ is the international standard for medical
-images and related information. It defines the formats and communication
+`DICOM <https://www.dicomstandard.org>`_ is the international standard for
+medical images and related information. It defines the formats and communication
 protocols for media exchange in radiology, cardiology, radiotherapy and other
 medical domains.
 
@@ -60,9 +60,9 @@ and is used to represent a DICOM Application Entity. With it you can:
 
 Once associated, the services available to the association can
 be used by sending
-`DIMSE-C <http://dicom.nema.org/medical/dicom/current/output/html/part07.html#chapter_9>`_
+`DIMSE-C <https://dicom.nema.org/medical/dicom/current/output/html/part07.html#chapter_9>`_
 and
-`DIMSE-N <http://dicom.nema.org/medical/dicom/current/output/html/part07.html#chapter_10>`_
+`DIMSE-N <https://dicom.nema.org/medical/dicom/current/output/html/part07.html#chapter_10>`_
 messages.
 
 Documentation
diff --git a/asv.conf.json b/asv.conf.json
index 8b1e4a516..00e8b25f9 100644
--- a/asv.conf.json
+++ b/asv.conf.json
@@ -36,7 +36,7 @@
     //"install_timeout": 600,
 
     // the base URL to show a commit for the project.
-    // "show_commit_url": "http://github.com/owner/project/commit/",
+    // "show_commit_url": "https://github.com/owner/project/commit/",
 
     // The Pythons you'd like to test against.  If not provided, defaults
     // to the current version of Python used to run `asv`.
diff --git a/docs/conf.py b/docs/conf.py
index 2e335473f..070dfb538 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -96,7 +96,7 @@
 extlinks = {
     # 'alias' : (url_prefix, caption)
     # Usage :dcm:`link text <part05/sect_6.2.html>`
-    "dcm": ("http://dicom.nema.org/medical/dicom/current/output/chtml/%s", None),
+    "dcm": ("https://dicom.nema.org/medical/dicom/current/output/chtml/%s", None),
     "gh": ("https://github.com/pydicom/%s", None),
     "issue": ("https://github.com/pydicom/pynetdicom/issues/%s", "#%s"),
     "pr": ("https://github.com/pydicom/pynetdicom/pull/%s", "#%s"),
@@ -306,7 +306,7 @@ def setup(app):
 
 # Example configuration for intersphinx: refer to
 # the Python standard library.
-# intersphinx_mapping = {'http://docs.python.org/': None}
+# intersphinx_mapping = {'https://docs.python.org/': None}
 
 
 # The following is used by sphinx.ext.linkcode to provide links to github
diff --git a/docs/index.rst b/docs/index.rst
index 789f9a4d4..469ad5c67 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -4,7 +4,7 @@
 ============
 
 :gh:`pynetdicom <pynetdicom>` is a pure Python package
-that implements the `DICOM <http://dicom.nema.org/>`_ networking protocol.
+that implements the `DICOM <https://www.dicomstandard.org/>`_ networking protocol.
 Working with
 :gh:`pydicom <pydicom>`, it allows the easy creation
 of DICOM Application Entities (AEs), which can then act as *Service Class
diff --git a/pynetdicom/apps/tests/test_common.py b/pynetdicom/apps/tests/test_common.py
index 1d3d903e8..932445900 100644
--- a/pynetdicom/apps/tests/test_common.py
+++ b/pynetdicom/apps/tests/test_common.py
@@ -613,7 +613,7 @@ def test_str_types(self):
             "TM": ("StudyTime", "120000.123456"),
             "UC": ("LongCodeValue", "So many characters in this one"),
             "UI": ("SOPClassUID", "1.2.3.4.5.6"),
-            "UR": ("CodingSchemeURL", "http://github.com/pydicom/pynetdicom"),
+            "UR": ("CodingSchemeURL", "https://github.com/pydicom/pynetdicom"),
             "UT": ("StrainAdditionalInformation", "Wheeeeeeeeee"),
         }
         for vr, (kw, val) in keywords.items():