diff --git a/README.md b/README.md
index 56b38de..78c8b24 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ See https://brettlangdon.github.io/git-vendor for the current MAN page documenta
 * `git vendor add [--prefix <dir>] <name> <repository> [<ref>]` - add a new vendored dependency.
 * `git vendor list [<name>]` - list current vendored dependencies, their source, and current vendored ref.
 * `git vendor update <name> [<ref>]` - update a vendored dependency.
+* `git vendor upstream <name> [<ref>] [--repo <repository>]` - share with the upstream vendored dependency.
 
 ## Installation
 Manually:
diff --git a/bin/git-vendor b/bin/git-vendor
index 373bf52..acbaf1d 100755
--- a/bin/git-vendor
+++ b/bin/git-vendor
@@ -13,6 +13,7 @@ Usage:
   git vendor list [<name>]
   git vendor remove <name>
   git vendor update <name> [<ref>]
+  git vendor upstream <name> [<ref>] [--repo <repository>]
 EOF
 }
 
@@ -27,7 +28,7 @@ require_work_tree
 command="$1"
 shift
 case "$command" in
-    "add"|"list"|"remove"|"update") ;;
+    "add"|"list"|"remove"|"update"|"upstream") ;;
     *) >&2 echo "error: unknown command \"$command\"" && _usage && exit 1 ;;
 esac
 
@@ -207,6 +208,66 @@ git-vendor-ref: $ref
 	done
 }
 
+cmd_upstream()
+{
+    require_clean_work_tree
+    while [ $# -gt 0 ] ; do
+        case $1 in
+            --repo)
+            repository_arg="$2"
+            shift # argument value
+            ;;
+            *)
+            if [ -z "$name" ]; then
+                name="$1"
+            elif [ -z "$ref" ]; then
+                ref="$1"
+            fi
+            ;;
+        esac
+        shift # current argument
+    done
+    if [ -z "$name" ]; then
+        die "Incorrect options provided: git vendor upstream <name> [<ref>] [--repo <repository>]"
+    fi
+    if [ -z "$ref" ]; then
+        ref="master"
+    fi
+    vendor_git_log_from_name "$name" |
+    while read a b junk; do
+        case "$a" in
+        START) ;;
+        git-vendor-dir:) dir="$b" ;;
+        git-vendor-repository:) repository="$b" ;;
+        END)
+            # Make sure the dependency exists on disk
+            if [ ! -d "$dir" ]; then
+                die "Dependency \"$1\" is missing from \"$dir\""
+            fi
+
+            # And hasn't been renamed
+            logname=$(vendor_name_from_dir "$dir")
+            if [ "$name" != "$logname" ]; then
+                die "Dependency \"$1\" was renamed \"$logname\""
+            fi
+
+            if [ ! -z "$repository_arg" ];
+            then
+                # override the repository read from the commit logs
+                # with the one read from the command line arguments
+                repository="$repository_arg"
+            fi
+            
+            if [ ! -z "$repository" ];
+            then
+                git subtree push --prefix "$dir" "$repository" "$ref"
+                break
+            fi
+            ;;
+        esac
+    done
+}
+
 cmd_remove()
 {
     require_clean_work_tree
diff --git a/etc/bash_completion.sh b/etc/bash_completion.sh
index 8db8d06..6cc587d 100755
--- a/etc/bash_completion.sh
+++ b/etc/bash_completion.sh
@@ -1,4 +1,4 @@
 _git_vendor()
 {
-    __gitcomp "add list update"
+    __gitcomp "add list update upstream"
 }
diff --git a/man/git-vendor.1 b/man/git-vendor.1
index b33fb3a..91d17df 100644
--- a/man/git-vendor.1
+++ b/man/git-vendor.1
@@ -18,6 +18,9 @@
 .P
 \fBgit\-vendor update <name> [<ref>]\fR
 .
+.P
+\fBgit\-vendor upstream <name> [<ref>]\fR
+.
 .SH "DESCRIPTION"
 Manage any repository dependencies with \fBgit\-subtree\fR\.
 .
@@ -25,7 +28,7 @@ Manage any repository dependencies with \fBgit\-subtree\fR\.
 \fBgit\-vendor\fR follows the same vendoring pattern that is used in the Go community\. Dependencies are stored under \fBvendor/<repository_uri>\fR\. For example, the dependency of \fBhttps://github\.com/brettlangdon/forge\.git\fR will be stored under \fBvendor/github\.com/brettlangdon/forge\fR by default\.
 .
 .P
-\fBgit\-vendor\fR is unable to \fBlist\fR or \fBupdate\fR any dependencies it has not added, the reason is that \fBgit\-vendor\fR adds special commit messages so that it can track existing dependencies\.
+\fBgit\-vendor\fR is unable to \fBlist\fR, \fBupdate\fR or \fBupstream\fR any dependencies it has not added, the reason is that \fBgit\-vendor\fR adds special commit messages so that it can track existing dependencies\.
 .
 .SH "COMMANDS"
 add [\-\-prefix <dir>] <name> <repository> [<ref>]
@@ -51,6 +54,12 @@ update <dir> <ref>
 .P
 Update the vendored dependency to a different version\.
 .
+.P
+upstream <dir> <ref>
+.
+.P
+Push the vendored dependency changes to the source repository\.
+.
 .SH "OPTIONS"
 \-\-prefix <dir>
 .
@@ -128,6 +137,58 @@ $ git vendor update forge
 .IP "" 0
 .
 .P
+Upstream changes to the source repository to a (new) branch \fBmy_changes\fR:
+.
+.IP "" 4
+.
+.nf
+
+$ git vendor upstream forge my_changes
+.
+.fi
+.
+.IP "" 0
+.
+.P
+Upstream changes to the source repository to \fBmaster\fR:
+.
+.IP "" 4
+.
+.nf
+
+$ git vendor upstream forge
+.
+.fi
+.
+.IP "" 0
+.
+.P
+Upstream changes to another repository to a (new) branch \fBmy_changes\fR:
+.
+.IP "" 4
+.
+.nf
+
+$ git vendor upstream forge my_changes --repo https://github.com/user/another.git
+.
+.fi
+.
+.IP "" 0
+.
+.P
+Upstream changes to another repository to \fBmaster\fR:
+.
+.IP "" 4
+.
+.nf
+
+$ git vendor upstream forge --repo https://github.com/user/another.git
+.
+.fi
+.
+.IP "" 0
+.
+.P
 Removing a dependency:
 .
 .IP "" 4
diff --git a/man/git-vendor.md b/man/git-vendor.md
index 74c319e..275b63b 100644
--- a/man/git-vendor.md
+++ b/man/git-vendor.md
@@ -11,13 +11,15 @@ git-vendor(1) -- manage vendored dependency subtrees
 
 `git-vendor update <name> [<ref>]`
 
+`git-vendor upstream <name> [<ref>]`
+
 ## DESCRIPTION
 
   Manage any repository dependencies with `git-subtree`.
 
   `git-vendor` follows the same vendoring pattern that is used in the Go community. Dependencies are stored under `vendor/<repository_uri>`. For example, the dependency of `https://github.com/brettlangdon/forge.git` will be stored under `vendor/github.com/brettlangdon/forge` by default.
 
-  `git-vendor` is unable to `list` or `update` any dependencies it has not added, the reason is that `git-vendor` adds special commit messages so that it can track existing dependencies.
+  `git-vendor` is unable to `list`, `update` or `upstream` any dependencies it has not added, the reason is that `git-vendor` adds special commit messages so that it can track existing dependencies.
 
 ## COMMANDS
 
@@ -37,6 +39,10 @@ git-vendor(1) -- manage vendored dependency subtrees
 
   Update the vendored dependency to a different version.
 
+  upstream &lt;dir&gt; &lt;ref&gt;
+
+  Push the vendored dependency changes to the source repository.
+
 
 ## OPTIONS
 
@@ -46,7 +52,7 @@ git-vendor(1) -- manage vendored dependency subtrees
 
   &lt;name&gt;
 
-  A name to provide the vendored dependency to use when listing/updating.
+  A name to provide the vendored dependency to use when listing/updating/pushing.
 
   &lt;repository&gt;
 
@@ -74,6 +80,22 @@ git-vendor(1) -- manage vendored dependency subtrees
 
     $ git vendor update forge
 
+  Upstream changes to the source repository to `master`:
+
+    $ git vendor upstream forge
+
+  Upstream changes to the source repository to a (new) branch my_changes:
+
+    $ git vendor upstream forge my_changes
+
+  Upstream changes to another repository to `master`:
+
+    $ git vendor upstream forge --repo https://github.com/user/another.git
+
+  Upstream changes to another repository to a (new) branch my_changes:
+
+    $ git vendor upstream forge my_changes --repo https://github.com/user/another.git
+
   Removing a dependency:
 
     $ git vendor remove forge