diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c1cb76d89..f3039ec68 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,53 +1,57 @@
 name: tests
 
 on:
   push:
   pull_request:
 
 jobs:
   linux_tests:
     runs-on: ubuntu-20.04
     if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
 
     strategy:
       fail-fast: true
       matrix:
         php: [5.5, 5.6, 7.0, 7.1, 7.2, 7.3, 7.4, 8.0]
 
     name: PHP ${{ matrix.php }}/Linux
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
           extensions: dom, curl, fileinfo, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, gd, ldap, intl, pspell
           tools: composer:v2
           coverage: none
 
       - name: Setup problem matchers
         run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
       - name: Install Aspell
         run: sudo apt-get -y install aspell aspell-en aspell-de
 
       - name: Setup composer
         run: |
             cp composer.json-dist composer.json
             composer require "kolab/net_ldap3:~1.1.1" --no-update
 
       - name: Fix PHPUnit for PHP8
         run: composer config platform.php 7.4
         if: matrix.php >= 8
 
+      - name: Fix for https://github.com/roundcube/plugin-installer/issues/56
+        run: composer require "roundcube/plugin-installer:0.3.3" --no-update
+        if: matrix.php < 7
+
       - name: Install dependencies
         run: composer install --prefer-dist --no-interaction --no-progress
 
       - name: Roundcube configuration
         run: cp .github/config-test.inc.php config/config-test.inc.php
 
       - name: Execute tests
         run: vendor/bin/phpunit -c tests/phpunit.xml