diff --git a/doc/rst/source/reference/features.rst b/doc/rst/source/reference/features.rst
index 63f437b89e9..e289aeb2c29 100644
--- a/doc/rst/source/reference/features.rst
+++ b/doc/rst/source/reference/features.rst
@@ -2309,7 +2309,7 @@ read directly by GMT and the netCDF grids written by GMT can be read
 by other programs that conform to those conventions. Three such programs are
 `ncview <https://cirrus.ucsd.edu/~pierce/software/ncview/index.html>`_, and `Panoply
 <http://www.giss.nasa.gov/tools/panoply/>`_; others can be found on the
-`netCDF website <http://www.unidata.ucar.edu/software/netcdf/software.html>`_.
+`netCDF website <https://archive.unidata.ucar.edu/software/netcdf/software.html>`_.
 Note that although many additional programs can read netCDF files, some are unable
 to read netCDF 4 files (if data compression has been applied).
 
diff --git a/doc/rst/source/reference/file-formats.rst b/doc/rst/source/reference/file-formats.rst
index 1d464076cf5..87798e18358 100644
--- a/doc/rst/source/reference/file-formats.rst
+++ b/doc/rst/source/reference/file-formats.rst
@@ -233,8 +233,8 @@ export your grids in the old classic format.  This can be achieved by setting
 
 Further reading:
 
-- `Unidata NetCDF Workshop: NetCDF Formats and Performance <http://www.unidata.ucar.edu/software/netcdf/workshops/most-recent/performance/index.html>`_
-- `Unidata NetCDF Workshop: What is Chunking? <http://www.unidata.ucar.edu/software/netcdf/workshops/most-recent/nc4chunking/WhatIsChunking.html>`_
+- `Unidata NetCDF Workshop: NetCDF Formats and Performance <https://archive.unidata.ucar.edu/software/netcdf/workshops/most-recent/performance/>`_
+- `Unidata NetCDF Workshop: What is Chunking? <https://archive.unidata.ucar.edu/software/netcdf/workshops/most-recent/nc4chunking/WhatIsChunking.html>`_
 - `HDF NetCDF-4 Performance Report <https://support.hdfgroup.org/archive/support/pubs/papers/2008-06_netcdf4_perf_report.pdf>`_
 
 Gridline and Pixel node registration
diff --git a/doc/rst/source/supplements/gshhg/gshhg.rst b/doc/rst/source/supplements/gshhg/gshhg.rst
index 05666f4732e..88816858146 100644
--- a/doc/rst/source/supplements/gshhg/gshhg.rst
+++ b/doc/rst/source/supplements/gshhg/gshhg.rst
@@ -176,7 +176,7 @@ Data Files
 ----------
 
 The data files read by gshhg are the native binary polygon files,
-available from `NCEI Shoreline Coastline Resources <https://www.ngdc.noaa.gov/mgg/shorelines/>`_ or
+available from `NCEI Shoreline Coastline Resources <https://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html>`_ or
 the `SOEST GSHHG Site <https://www.soest.hawaii.edu/pwessel/gshhg>`_. Note that these
 are different from the netCDF-formatted files used by GMT in the
 modules :doc:`gmtselect </gmtselect>`, :doc:`grdlandmask </grdlandmask>`,
diff --git a/doc/rst/source/supplements/seis/meca_notes.rst_ b/doc/rst/source/supplements/seis/meca_notes.rst_
index d00211c64d7..95f7a799595 100644
--- a/doc/rst/source/supplements/seis/meca_notes.rst_
+++ b/doc/rst/source/supplements/seis/meca_notes.rst_
@@ -9,5 +9,5 @@ References
 Author
 ------
 
-Genevieve Patau, `Laboratory of Seismogenesis <http://www.ipgp.fr/fr/sismo/sismologie>`_,
+Genevieve Patau, `Laboratory of Seismogenesis <https://www.ipgp.fr/fr/sismo/sismologie>`_,
 Institut de Physique du Globe de Paris, Departement de Sismologie, Paris, France