diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index a6aef547..943198e0 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -13,6 +13,7 @@ jobs:
     strategy:
       matrix:
         php-version:
+          - "7.3"
           - "7.4"
           - "8.0"
           - "8.1"
@@ -60,7 +61,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "7.4"
+          php-version: "7.3"
           ini-values: post_max_size=256M, max_execution_time=180
           coverage: xdebug
 
@@ -91,7 +92,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "7.4"
+          php-version: "7.3"
           ini-values: post_max_size=256M, max_execution_time=180
 
       - name: Install dependencies
diff --git a/composer.json b/composer.json
index 0225c019..d6cdce05 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": ">=7.4",
+        "php": ">=7.3",
         "ext-json": "*"
     },
     "require-dev": {