diff --git a/doc/src/Install_git.rst b/doc/src/Install_git.rst
index 4e7db77873..7ad6ca18c1 100644
--- a/doc/src/Install_git.rst
+++ b/doc/src/Install_git.rst
@@ -156,9 +156,9 @@ changed.  How to do this depends on the build system you are using.
 .. admonition:: Git protocols
    :class: note
 
-   The servers at github.com support the "git://" and "https://" access
-   protocols for anonymous, read-only access.  If you have a suitably
-   configured GitHub account, you may also use SSH protocol with the
+   The servers at github.com support the "https://" access protocol for
+   anonymous, read-only access.  If you have a suitably configured GitHub
+   account, you may also use SSH protocol with the
    URL "git@github.com:lammps/lammps.git".
 
 The LAMMPS GitHub project is currently managed by Axel Kohlmeyer
diff --git a/doc/src/kspace_style.rst b/doc/src/kspace_style.rst
index 1dec62bb43..b6287650b9 100644
--- a/doc/src/kspace_style.rst
+++ b/doc/src/kspace_style.rst
@@ -310,7 +310,7 @@ Forschungszentrum Juelich.
 
 The library is available for download at "http://scafacos.de" or can
 be cloned from the git-repository
-"git://github.com/scafacos/scafacos.git".
+"https://github.com/scafacos/scafacos.git".
 
 In order to use this KSpace style, you must download and build the
 ScaFaCoS library, then build LAMMPS with the SCAFACOS package
diff --git a/doc/utils/requirements.txt b/doc/utils/requirements.txt
index 9b8e106875..9797d4d119 100644
--- a/doc/utils/requirements.txt
+++ b/doc/utils/requirements.txt
@@ -1,6 +1,6 @@
 Sphinx
 sphinxcontrib-spelling
-git+git://github.com/akohlmey/sphinx-fortran@parallel-read
+git+https://github.com/akohlmey/sphinx-fortran@parallel-read
 sphinx_tabs
 breathe
 Pygments
diff --git a/tools/offline/scripts/use_git_cache.sh b/tools/offline/scripts/use_git_cache.sh
index 46e42ca7bd..e65c06c8ed 100644
--- a/tools/offline/scripts/use_git_cache.sh
+++ b/tools/offline/scripts/use_git_cache.sh
@@ -8,12 +8,12 @@ fi
 
 export GIT_CONFIG_COUNT=1
 export GIT_CONFIG_KEY_0="url.$GITHUB_PROXY_DIR/.insteadOf"
-export GIT_CONFIG_VALUE_0=git://github.com/
+export GIT_CONFIG_VALUE_0=https://github.com/
 
-echo "Redirecting git://github.com urls to local cache..."
+echo "Redirecting https://github.com urls to local cache..."
 
 function deactivate_git_cache {
-    echo "Removing git://github.com redirect..."
+    echo "Removing https://github.com redirect..."
     unset GIT_CONFIG_COUNT
     unset GIT_CONFIG_KEY_0
     unset GIT_CONFIG_VALUE_0
diff --git a/tools/offline/use_caches.sh b/tools/offline/use_caches.sh
index 71d955fe4c..5db78fd765 100644
--- a/tools/offline/use_caches.sh
+++ b/tools/offline/use_caches.sh
@@ -63,7 +63,7 @@ echo "or"
 echo
 echo "-D LAMMPS_DOWNLOADS_URL=${HTTP_CACHE_URL} -C \"${LAMMPS_HTTP_CACHE_CONFIG}\""
 echo
-echo "pip installations and git clones (from git://) are automatically redirected"
+echo "pip installations and git clones (from https://) are automatically redirected"
 echo
 echo Use 'deactivate_caches' to revert changes
 echo
diff --git a/tools/singularity/README.md b/tools/singularity/README.md
index bd13d75ad7..db7aa9e3b0 100644
--- a/tools/singularity/README.md
+++ b/tools/singularity/README.md
@@ -15,7 +15,7 @@ built CentOS 7.x singularity container.
 
 ```
 cd some/work/directory
-git clone --depth 500  git://github.com/lammps/lammps.git lammps
+git clone --depth 500  https://github.com/lammps/lammps.git lammps
 mkdir build-centos7
 cd build-centos7
 sudo singularity build centos7.sif ../tools/singularity/centos7.def