diff --git a/composer.json b/composer.json
index 1a7446c..7e68dea 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=7.2",
+        "php": ">=7.3",
         "psr/http-factory": "~1.0",
         "psr/http-message": "~1.0",
         "psr/http-server-handler":  "~1.0",
diff --git a/composer.lock b/composer.lock
index 6f27dbc..6c47046 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "041c27e394aba3e5c3bf6cbe8751f845",
+    "content-hash": "bc05598d49e39b0082767d94ecb5bd4d",
     "packages": [
         {
             "name": "psr/http-factory",
@@ -4652,7 +4652,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.2"
+        "php": ">=7.3"
     },
     "platform-dev": [],
     "plugin-api-version": "1.1.0"
diff --git a/docker-compose.yml b/docker-compose.yml
index 97e3292..7dabe4b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -25,8 +25,3 @@ services:
     volumes:
       - .:/usr/local/src/wellrested
       - ./docker/nginx/site.conf:/etc/nginx/conf.d/default.conf
-
-  php-fpm:
-    image: php:7.4-fpm
-    volumes:
-      - .:/usr/local/src/wellrested
diff --git a/docker/nginx/site.conf b/docker/nginx/site.conf
index 453d502..ba76d7e 100644
--- a/docker/nginx/site.conf
+++ b/docker/nginx/site.conf
@@ -26,7 +26,7 @@ server {
   # PHP
   location ~ \.php$ {
     include fastcgi_params;
-    fastcgi_pass php-fpm:9000;
+    fastcgi_pass php:9000;
     fastcgi_index index.php;
     fastcgi_buffers 8 8k;
     fastcgi_buffer_size 16k;
diff --git a/docker/php/Dockerfile b/docker/php/Dockerfile
index aeae46a..9589150 100644
--- a/docker/php/Dockerfile
+++ b/docker/php/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.4-cli
+FROM php:7.3-fpm
 
 RUN DEBIAN_FRONTEND=noninteractive \
   apt-get update && \
@@ -27,20 +27,18 @@ RUN mkdir /usr/local/src/wellrested && \
   chown -R www-data:www-data /usr/local/src/wellrested && \
   chown -R www-data:www-data /var/www
 
-COPY ./src /usr/local/src/wellrested/src
-COPY ./test /usr/local/src/wellrested/test
-COPY ./composer.* /usr/local/src/wellrested/
-COPY ./phpunit.xml.dist /usr/local/src/wellrested/
+# Copy entrypoint script
+COPY docker/php/entrypoint /usr/local/bin
 
 # Add symlinks for php-cs-fixer, phpunit, and psalm for easier running
 RUN ln -s /usr/local/src/wellrested/vendor/bin/php-cs-fixer /usr/local/bin/php-cs-fixer
 RUN ln -s /usr/local/src/wellrested/vendor/bin/phpunit /usr/local/bin/phpunit
 RUN ln -s /usr/local/src/wellrested/vendor/bin/psalm /usr/local/bin/psalm
 
+ENTRYPOINT ["entrypoint"]
+
+CMD ["php-fpm"]
+
 WORKDIR /usr/local/src/wellrested
 
-USER www-data
-
-ENTRYPOINT ["dumb-init", "--"]
-
-RUN composer install
+USER www-data
\ No newline at end of file
diff --git a/docker/php/entrypoint b/docker/php/entrypoint
new file mode 100755
index 0000000..67bca32
--- /dev/null
+++ b/docker/php/entrypoint
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Run CLI commands with dumb-init to allow better signal handling.
+# Run PHP-FPM as PID 1.
+# https://engineeringblog.yelp.com/2016/01/dumb-init-an-init-for-docker.html
+if [ "$1" == 'php-fpm' ] ; then
+  exec php-fpm
+else
+  exec dumb-init -- "$@"
+fi
diff --git a/tests/Message/StreamTest.php b/tests/Message/StreamTest.php
index b70b920..72ef2ef 100644
--- a/tests/Message/StreamTest.php
+++ b/tests/Message/StreamTest.php
@@ -15,8 +15,9 @@ class StreamTest extends TestCase
     protected function setUp(): void
     {
         $this->resource = fopen('php://memory', 'w+');
-        $this->resourceDevNull = fopen('/dev/null', 'r');
+        $this->resourceDevNull = fopen('/dev/zero', 'r');
         fwrite($this->resource, $this->content);
+        StreamHelper::$fail = false;
     }
 
     protected function tearDown(): void
@@ -105,7 +106,8 @@ class StreamTest extends TestCase
 
     public function testTellThrowsRuntimeExceptionWhenUnableToReadStreamPosition(): void
     {
-        $stream = new Stream($this->resourceDevNull);
+        StreamHelper::$fail = true;
+        $stream = new Stream($this->resource);
         $this->expectException(RuntimeException::class);
         $stream->tell();
     }
@@ -135,7 +137,8 @@ class StreamTest extends TestCase
 
     public function testSeekThrowsRuntimeExceptionWhenUnableToSeek(): void
     {
-        $stream = new Stream($this->resourceDevNull);
+        StreamHelper::$fail = true;
+        $stream = new Stream($this->resource);
         $this->expectException(RuntimeException::class);
         $stream->seek(10);
     }
@@ -150,7 +153,8 @@ class StreamTest extends TestCase
 
     public function testRewindThrowsRuntimeExceptionWhenUnableToRewind(): void
     {
-        $stream = new Stream($this->resourceDevNull);
+        StreamHelper::$fail = true;
+        $stream = new Stream($this->resource);
         $this->expectException(RuntimeException::class);
         $stream->rewind();
     }
@@ -384,3 +388,37 @@ class StreamTest extends TestCase
         $this->assertNull($stream->getMetadata());
     }
 }
+
+// -----------------------------------------------------------------------------
+
+// Declare functions in this namespace so the class under test will use these
+// instead of the internal global functions during testing.
+
+class StreamHelper
+{
+    public static $fail = false;
+}
+
+function fseek($resource, $offset, $whence = SEEK_SET)
+{
+    if (StreamHelper::$fail) {
+        return -1;
+    }
+    return \fseek($resource, $offset, $whence);
+}
+
+function ftell($resource)
+{
+    if (StreamHelper::$fail) {
+        return false;
+    }
+    return \ftell($resource);
+}
+
+function rewind($resource)
+{
+    if (StreamHelper::$fail) {
+        return false;
+    }
+    return \rewind($resource);
+}