diff --git a/features/package-install.feature b/features/package-install.feature
index 71733c806..b1f69e8db 100644
--- a/features/package-install.feature
+++ b/features/package-install.feature
@@ -360,10 +360,18 @@ Feature: Install WP-CLI packages
   Scenario: Install a package from Git using a shortened package identifier with a specific version
     Given an empty directory
 
-    When I run `wp package install schlessera/test-command:0.1.0`
+    # Need to specify actual tag.
+    When I try `wp package install schlessera/test-command:0.1.0`
+    Then STDERR should contain:
+      """
+      Error: Couldn't download composer.json file from 'https://raw.githubusercontent.com/schlessera/test-command/0.1.0/composer.json' (HTTP code 404).
+      """
+    And STDOUT should be empty
+
+    When I run `wp package install schlessera/test-command:v0.1.0`
     Then STDOUT should contain:
       """
-      Installing package schlessera/test-command (0.1.0)
+      Installing package schlessera/test-command (v0.1.0)
       Updating {PACKAGE_PATH}composer.json to require the package...
       Registering https://github.com/schlessera/test-command.git as a VCS repository...
       Using Composer to install the package...
@@ -588,6 +596,52 @@ Feature: Install WP-CLI packages
       rocket
       """
 
+  @github-api
+  Scenario: Install a package with a composer.json that differs between versions
+    Given an empty directory
+
+    When I run `wp package install wp-cli-test/version-composer-json-different:v1.0.0`
+    Then STDOUT should contain:
+      """
+      Installing package wp-cli-test/version-composer-json-different (v1.0.0)
+      Updating {PACKAGE_PATH}composer.json to require the package...
+      """
+    And STDOUT should contain:
+      """
+      Success: Package installed.
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should exist
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should contain:
+      """
+      1.0.0
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should not contain:
+      """
+      1.0.1
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli/profile-command directory should not exist
+
+    When I run `wp package install wp-cli-test/version-composer-json-different:v1.0.1`
+    Then STDOUT should contain:
+      """
+      Installing package wp-cli-test/version-composer-json-different (v1.0.1)
+      Updating {PACKAGE_PATH}composer.json to require the package...
+      """
+    And STDOUT should contain:
+      """
+      Success: Package installed.
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should exist
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should contain:
+      """
+      1.0.1
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli-test/version-composer-json-different/composer.json file should not contain:
+      """
+      1.0.0
+      """
+    And the {PACKAGE_PATH}/vendor/wp-cli/profile-command directory should exist
+
   Scenario: Install a package from a local zip
     Given an empty directory
     And I run `wget -q -O google-sitemap-generator-cli.zip https://github.com/wp-cli/google-sitemap-generator-cli/archive/master.zip`
diff --git a/src/Package_Command.php b/src/Package_Command.php
index 971a62c72..6ad7d8145 100644
--- a/src/Package_Command.php
+++ b/src/Package_Command.php
@@ -278,7 +278,7 @@ public function install( $args, $assoc_args ) {
 			if ( is_string( $package ) ) {
 				if ( $this->is_git_repository( $package ) ) {
 					$git_package = $package;
-					$package_name = $this->check_git_package_name( $package_name );
+					$package_name = $this->check_git_package_name( $package_name, $version );
 				}
 			} elseif ( $package_name !== $package->getPrettyName() ) {
 				// BC support for specifying lowercase names for mixed-case package index packages - don't bother warning.
@@ -972,10 +972,14 @@ private function is_git_repository( $package ) {
 
 	/**
 	 * Checks that `$package_name` matches the name in the repo composer.json, and return corrected value if not.
+	 *
+	 * @string $package_name Package name to check.
+	 * @string $version Optional. Package version. Default 'master'.
+	 * @string Package name, possibly changed to match that in repo.
 	 */
-	private function check_git_package_name( $package_name ) {
+	private function check_git_package_name( $package_name, $version = '' ) {
 		// Generate raw git URL of composer.json file.
-		$raw_content_url = 'https://raw.githubusercontent.com/' . $package_name . '/master/composer.json';
+		$raw_content_url = 'https://raw.githubusercontent.com/' . $package_name . '/' . $this->get_raw_git_version( $version ) . '/composer.json';
 		$github_token = getenv( 'GITHUB_TOKEN' ); // Use GITHUB_TOKEN if available to avoid authorization failures or rate-limiting.
 		$headers = $github_token ? array( 'Authorization' => 'token ' . $github_token ) : array();
 
@@ -1004,6 +1008,32 @@ private function check_git_package_name( $package_name ) {
 		return $package_name;
 	}
 
+	/**
+	 * Get the version to use for raw github request. Very basic.
+	 *
+	 * @string $version Package version.
+	 * @string Version to use for github request.
+	 */
+	private function get_raw_git_version( $version ) {
+		if ( '' !== $version ) {
+			// If Composer hash given then just use whatever's after it.
+			if ( false !== ( $hash_pos = strpos( $version, '#' ) ) ) {
+				$version = substr( $version, $hash_pos + 1 );
+			} else {
+				// Strip any Composer 'dev-' prefix.
+				if ( 0 === strncmp( $version, 'dev-', 4 ) ) {
+					$version = substr( $version, 4 );
+				}
+				// Ignore/strip any relative suffixes.
+				if ( false !== ( $rel_pos = strpos( $version, '^' ) ) || false !== ( $rel_pos = strpos( $version, '~' ) ) ) {
+					$version = substr( $version, 0, $rel_pos );
+				}
+			}
+		}
+		// Default to master.
+		return '' === $version ? 'master' : $version;
+	}
+
 	/**
 	 * Sets `COMPOSER_AUTH` environment variable (which Composer merges into the config setup in `Composer\Factory::createConfig()`) depending on available environment variables.
 	 * Avoids authorization failures when accessing various sites.