diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 94ddb64..b53eed0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -81,7 +81,7 @@ When you do begin working on your feature, here are some guidelines to consider:
 * **Submit one feature per pull request.** If you have multiple features you
   wish to submit, please break them into separate pull requests.
 * **Write good commit messages.** This project follows the
-  [Conventional Commits][] specification and uses Git hooks to ensure all
+  [Conventional Commits][conv-commit] specification and uses Git hooks to ensure all
   commits follow this standard. Running `composer install` will set up the Git
   hooks, so when you run `git commit`, you'll be prompted to create a commit
   using the Conventional Commits rules.
@@ -126,3 +126,4 @@ Your new test should run along with the other tests.
 [issues]: https://github.com/ramsey/composer-install/issues
 [pull requests]: https://github.com/ramsey/composer-install/pulls
 [gh-flow]: https://guides.github.com/introduction/flow/
+[conv-commit]: https://www.conventionalcommits.org/
\ No newline at end of file
diff --git a/README.md b/README.md
index c50fe8e..4552fe6 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,8 @@ For example:
 
 #### ignore-cache
 
+Normally, ramsey/composer-install preserves composer's cache between jobs
+so that subsequent identically-invoked jobs execute faster.
 If you have jobs for which you wish to completely ignore the caching step, you
 may use the `ignore-cache` input parameter. When present, ramsey/composer-install
 will neither read from nor write to the cache.
@@ -174,6 +176,17 @@ even more specific, you can specify a suffix to be added to the cache key via th
 
 :warning: Note: specifying a `custom-cache-key` will take precedence over the `custom-cache-suffix`.
 
+
+#### require-lock-file
+
+By default, if no composer.lock file is found in the working directory 
+ramsey/composer-install will invoke `composer update` regardless of the value of
+`dependency-versions`.
+
+If this is set to a value of `true`, ramsey/composer-install will fail in its
+execution if it does not find a lock file.
+
+
 ### Fork and private repositories
 
 Sometimes it's needed to use the `repositories` key in your `composer.json` to pull in forks, PRs with patches or private repositories. In this case, your GitHub Action may start failing with a `Could not authenticate against github.com` error message. To solve this, you need to add a GitHub Personal Access token, and this bit to your Action configuration:
diff --git a/action.yml b/action.yml
index 17339c4..35d8693 100644
--- a/action.yml
+++ b/action.yml
@@ -55,7 +55,6 @@ runs:
 
     - name: "Determine Composer paths"
       id: "composer"
-      if: steps.should-cache.outputs.do-cache == 1
       shell: "bash"
       run: |
         ${GITHUB_ACTION_PATH}/bin/composer_paths.sh \
diff --git a/bin/composer_paths.sh b/bin/composer_paths.sh
index decf725..f608e09 100755
--- a/bin/composer_paths.sh
+++ b/bin/composer_paths.sh
@@ -45,7 +45,7 @@ if [ ! -f "${composer_lock}" ]; then
     composer_lock=""
 fi
 
-composer_version="$($composer_path --version)"
+composer_version="$($composer_path --version 2>/dev/null)"
 cache_dir="$($composer_path --working-dir="${working_directory}" config cache-dir)"
 
 echo "::debug::Composer path is '${composer_path}'"
diff --git a/tests/expect/composer_install_01.exp b/tests/expect/composer_install_01.exp
index cebb2d8..e84a76e 100755
--- a/tests/expect/composer_install_01.exp
+++ b/tests/expect/composer_install_01.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "" "" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi'"
diff --git a/tests/expect/composer_install_02.exp b/tests/expect/composer_install_02.exp
index 9fc8bd9..01043ff 100755
--- a/tests/expect/composer_install_02.exp
+++ b/tests/expect/composer_install_02.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "lowest" "" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "lowest" "" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --prefer-lowest --prefer-stable'"
diff --git a/tests/expect/composer_install_03.exp b/tests/expect/composer_install_03.exp
index 91c5469..d035fad 100755
--- a/tests/expect/composer_install_03.exp
+++ b/tests/expect/composer_install_03.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "highest" "" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "highest" "" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi'"
diff --git a/tests/expect/composer_install_04.exp b/tests/expect/composer_install_04.exp
index af9fa20..1fbbee0 100755
--- a/tests/expect/composer_install_04.exp
+++ b/tests/expect/composer_install_04.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "locked" "" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "locked" "" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi'"
diff --git a/tests/expect/composer_install_05.exp b/tests/expect/composer_install_05.exp
index b2732dc..f44135b 100755
--- a/tests/expect/composer_install_05.exp
+++ b/tests/expect/composer_install_05.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader'"
diff --git a/tests/expect/composer_install_06.exp b/tests/expect/composer_install_06.exp
index c9e45ed..0738951 100755
--- a/tests/expect/composer_install_06.exp
+++ b/tests/expect/composer_install_06.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "lowest" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "lowest" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --prefer-lowest --prefer-stable --ignore-platform-reqs --optimize-autoloader'"
diff --git a/tests/expect/composer_install_07.exp b/tests/expect/composer_install_07.exp
index ca2b5b6..5eccc1f 100755
--- a/tests/expect/composer_install_07.exp
+++ b/tests/expect/composer_install_07.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "highest" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "highest" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader'"
diff --git a/tests/expect/composer_install_08.exp b/tests/expect/composer_install_08.exp
index 2678767..e0dd379 100755
--- a/tests/expect/composer_install_08.exp
+++ b/tests/expect/composer_install_08.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "locked" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "locked" "--ignore-platform-reqs --optimize-autoloader" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader'"
diff --git a/tests/expect/composer_install_09.exp b/tests/expect/composer_install_09.exp
index 4d030f7..6179993 100755
--- a/tests/expect/composer_install_09.exp
+++ b/tests/expect/composer_install_09.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_10.exp b/tests/expect/composer_install_10.exp
index 20324af..3e94314 100755
--- a/tests/expect/composer_install_10.exp
+++ b/tests/expect/composer_install_10.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "lowest" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "lowest" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --prefer-lowest --prefer-stable --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_11.exp b/tests/expect/composer_install_11.exp
index 5db0e60..0e1614a 100755
--- a/tests/expect/composer_install_11.exp
+++ b/tests/expect/composer_install_11.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "highest" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "highest" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_12.exp b/tests/expect/composer_install_12.exp
index 35763ec..d7190e7 100755
--- a/tests/expect/composer_install_12.exp
+++ b/tests/expect/composer_install_12.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "locked" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "locked" "" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_13.exp b/tests/expect/composer_install_13.exp
index a6f84c4..925ba1a 100755
--- a/tests/expect/composer_install_13.exp
+++ b/tests/expect/composer_install_13.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_14.exp b/tests/expect/composer_install_14.exp
index 9fa7d07..bb54ba8 100755
--- a/tests/expect/composer_install_14.exp
+++ b/tests/expect/composer_install_14.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "lowest" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "lowest" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --prefer-lowest --prefer-stable --ignore-platform-reqs --optimize-autoloader --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_15.exp b/tests/expect/composer_install_15.exp
index af1c715..801cc87 100755
--- a/tests/expect/composer_install_15.exp
+++ b/tests/expect/composer_install_15.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "highest" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "highest" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_16.exp b/tests/expect/composer_install_16.exp
index f2bb343..0a7b11c 100755
--- a/tests/expect/composer_install_16.exp
+++ b/tests/expect/composer_install_16.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "locked" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock"
+spawn ../../bin/composer_install.sh "locked" "--ignore-platform-reqs --optimize-autoloader" "../fixtures/with-lock-file" "" "" "../fixtures/with-lock-file/composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi --ignore-platform-reqs --optimize-autoloader --working-dir ../fixtures/with-lock-file'"
diff --git a/tests/expect/composer_install_17.exp b/tests/expect/composer_install_17.exp
index 93cf0bf..fdd2b19 100755
--- a/tests/expect/composer_install_17.exp
+++ b/tests/expect/composer_install_17.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "foobar" "" "" "" "" "composer.lock"
+spawn ../../bin/composer_install.sh "foobar" "" "" "" "" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer install --no-interaction --no-progress --ansi'"
diff --git a/tests/expect/composer_install_18.exp b/tests/expect/composer_install_18.exp
index 77a0440..c6e7af1 100755
--- a/tests/expect/composer_install_18.exp
+++ b/tests/expect/composer_install_18.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "" "" "" "../fixtures/composer.phar" "composer.lock"
+spawn ../../bin/composer_install.sh "" "" "" "" "../fixtures/composer.phar" "composer.lock" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php ../fixtures/composer.phar install --no-interaction --no-progress --ansi'"
diff --git a/tests/expect/composer_install_19.exp b/tests/expect/composer_install_19.exp
index 398c24e..feca718 100755
--- a/tests/expect/composer_install_19.exp
+++ b/tests/expect/composer_install_19.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/env -S expect -f
 
 set timeout 3
-spawn ../../bin/composer_install.sh "" "" "../fixtures/no-lock-file" "" "" ""
+spawn ../../bin/composer_install.sh "" "" "../fixtures/no-lock-file" "" "" "" ""
 match_max 100000
 
 expect "::debug::Using the following Composer command: '*/php */composer update --no-interaction --no-progress --ansi --working-dir ../fixtures/no-lock-file'"
diff --git a/tests/expect/composer_install_20.exp b/tests/expect/composer_install_20.exp
new file mode 100755
index 0000000..2edc2da
--- /dev/null
+++ b/tests/expect/composer_install_20.exp
@@ -0,0 +1,8 @@
+#!/usr/bin/env -S expect -f
+
+set timeout 3
+spawn ../../bin/composer_install.sh "" "" "../fixtures/no-lock-file" "" "" "" "true"
+match_max 100000
+
+expect "::error title=Composer Lock File Not Found::Unable to find 'composer.lock'"
+expect eof
\ No newline at end of file