diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index fb7fcd6c4b..ea71de6f57 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -1832,7 +1832,7 @@ the status of your battery in the system tray.")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://github.com/TrilbyWhite/interrobang")
+                      (url "https://github.com/TrilbyWhite/interrobang")
                       (commit commit)))
                 (file-name (string-append name "-" version))
                 (sha256
diff --git a/gnu/packages/audio.scm b/gnu/packages/audio.scm
index 40700cae3d..62b526b10d 100644
--- a/gnu/packages/audio.scm
+++ b/gnu/packages/audio.scm
@@ -190,7 +190,7 @@ streams from live audio.")
     (source (origin
               (method git-fetch)
               (uri (git-reference
-                    (url "git://git.ardour.org/ardour/ardour.git")
+                    (url "https://git.ardour.org/ardour/ardour.git")
                     (commit version)))
               (snippet
                ;; Ardour expects this file to exist at build time.  The revision
diff --git a/gnu/packages/embedded.scm b/gnu/packages/embedded.scm
index 1f7176ae78..5e51fe2d01 100644
--- a/gnu/packages/embedded.scm
+++ b/gnu/packages/embedded.scm
@@ -299,7 +299,7 @@ languages are C and C++.")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://git.zapb.de/libjaylink.git")
+                      (url "https://git.zapb.de/libjaylink.git")
                       (commit commit)))
                 (file-name (string-append name "-" version "-checkout"))
                 (sha256
@@ -365,7 +365,7 @@ language.")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://git.code.sf.net/p/openocd/code.git")
+                      (url "https://git.code.sf.net/p/openocd/code.git")
                       (commit commit)))
                 (sha256
                  (base32
diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index e1d4a3c759..f50bcfc105 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -5882,7 +5882,7 @@ documents and diagrams, playing media, scanning, and much more.")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://git.gnome.org/byzanz")
+                      (url "https://git.gnome.org/browse/byzanz")
                       (commit commit)))
                 (file-name (string-append name "-" version "-checkout"))
                 (sha256
diff --git a/gnu/packages/gnunet.scm b/gnu/packages/gnunet.scm
index f3fe637b13..837f9a21b6 100644
--- a/gnu/packages/gnunet.scm
+++ b/gnu/packages/gnunet.scm
@@ -336,7 +336,7 @@ kinds of basic applications for the foundation of a GNU internet.")
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://git.sv.gnu.org/guix/gnunet.git")
+                      (url "https://git.savannah.gnu.org/git/guix/gnunet.git/")
                       (commit commit)))
                 (file-name (string-append name "-" version "-checkout"))
                 (sha256
diff --git a/gnu/packages/java.scm b/gnu/packages/java.scm
index da68487b01..cd29bbef12 100644
--- a/gnu/packages/java.scm
+++ b/gnu/packages/java.scm
@@ -651,7 +651,7 @@ the standard javac executable.  The tool runs on JamVM instead of SableVM.")))
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
-                      (url "git://git.savannah.gnu.org/classpath.git")
+                      (url "https://git.savannah.gnu.org/git/classpath.git")
                       (commit commit)))
                 (sha256
                  (base32
diff --git a/gnu/packages/microcom.scm b/gnu/packages/microcom.scm
index cfa2518f18..aa42e99213 100644
--- a/gnu/packages/microcom.scm
+++ b/gnu/packages/microcom.scm
@@ -32,7 +32,7 @@
     (source (origin
               (method git-fetch)
               (uri (git-reference
-                    (url "git://git.pengutronix.de/git/tools/microcom.git")
+                    (url "https://git.pengutronix.de/git/tools/microcom.git")
                     (commit "v2016.01.0")))
               (file-name (string-append name "-" version "-checkout"))
               (sha256
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 6fe83b2a8b..3609ff055c 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -13376,7 +13376,7 @@ PNG, JPEG, JPEG2000 and GIF files in pure Python.")
      (origin
        (method git-fetch)
        (uri (git-reference
-             (url "git://github.com/tgalal/python-axolotl-curve25519")
+             (url "https://github.com/tgalal/python-axolotl-curve25519")
              (commit "e4a9c4de0eae27223200579c58d1f8f6d20637e2")))
        (file-name (string-append name "-" version "-checkout"))
        (sha256
diff --git a/gnu/packages/shells.scm b/gnu/packages/shells.scm
index f1b408982c..09a6c3a03f 100644
--- a/gnu/packages/shells.scm
+++ b/gnu/packages/shells.scm
@@ -174,7 +174,7 @@ highlighting.")
     (source (origin
               (method git-fetch)
               (uri (git-reference
-                    (url "git://github.com/rakitzis/rc.git")
+                    (url "https://github.com/rakitzis/rc.git")
                     ;; commit name 'release: rc-1.7.4'
                     (commit "c884da53a7c885d46ace2b92de78946855b18e92")))
               (sha256
diff --git a/gnu/packages/web.scm b/gnu/packages/web.scm
index 253fd8b019..13a46a5503 100644
--- a/gnu/packages/web.scm
+++ b/gnu/packages/web.scm
@@ -546,7 +546,7 @@ parser written in ANSI C and a small validating JSON generator.")
               ;; things from Git.
               (method git-fetch)
               (uri (git-reference
-                    (url "git://git.libwebsockets.org/libwebsockets")
+                    (url "https://github.com/warmcat/libwebsockets.git")
                     (commit (string-append "v" version
                                            "-chrome37-firefox30"))))
               (sha256