diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b909f34e1..b1dbbf7db 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,6 @@ jobs:
     strategy:
       matrix:
         cfg:
-          - { os: 'ubuntu-20.04', php: '7.4' }
           - { os: 'ubuntu-22.04', php: '8.1' }
           - { os: 'ubuntu-22.04', php: '8.3' }
     runs-on: ${{ matrix.cfg.os }}
@@ -39,7 +38,6 @@ jobs:
     strategy:
       matrix:
         cfg:
-          - { os: 'ubuntu-20.04', php: '7.4' }
           - { os: 'ubuntu-22.04', php: '8.1' }
           - { os: 'ubuntu-22.04', php: '8.3' }
     runs-on: ${{ matrix.cfg.os }}
@@ -106,7 +104,6 @@ jobs:
     strategy:
       matrix:
         cfg:
-          - { os: 'ubuntu-20.04', php: '7.4' }
           - { os: 'ubuntu-22.04', php: '8.1' }
           - { os: 'ubuntu-22.04', php: '8.3' }
     runs-on: ${{ matrix.cfg.os }}
diff --git a/SETUP/INSTALL.md b/SETUP/INSTALL.md
index 63a06f40a..7c67c54a7 100644
--- a/SETUP/INSTALL.md
+++ b/SETUP/INSTALL.md
@@ -16,8 +16,8 @@ The following lists supported versions for the four primary middleware
 components.
 
 ### PHP
-PHP version 7.4 is the minimum supported version. Limited testing has been done
-on PHP 8.1 and 8.3.
+PHP version 8.1 is the minimum supported version although limited testing has been done
+on PHP versions < 8.3.
 
 The following PHP extensions are required. They are listed below with their
 Ubuntu system package names.
@@ -50,11 +50,11 @@ change `core.disable_super_globals` to `false`, and flush the phpbb cache.
 
 ## Distro support
 These middleware components match the following major distribution releases:
-* Ubuntu 18.04, Bionic (with PHP 7.4 upgrade)
-* Ubuntu 20.04, Focal
-* Ubuntu 22.04, Jammy (with possible PHP 7.4 downgrade)
-* RHEL / CentOS 7.x family (with PHP 7.4 and MariaDB 10.2 or later upgrade)
-* RHEL / CentOS 8.x family
+* Ubuntu 20.04, Focal (with PHP 8.1 upgrade)
+* Ubuntu 22.04, Jammy
+* Ubuntu 24.04, Noble
+* RHEL / CentOS 8.x family (with PHP 8.1 upgrade)
+* RHEL / CentOS 9.x family
 
 ## Browser support
 The following are the lowest known supported browser versions for the code:
diff --git a/SETUP/tests/unittests/ParamValidatorTest.php b/SETUP/tests/unittests/ParamValidatorTest.php
index 864d5e48a..279be0e2e 100644
--- a/SETUP/tests/unittests/ParamValidatorTest.php
+++ b/SETUP/tests/unittests/ParamValidatorTest.php
@@ -372,18 +372,9 @@ public function testBoolFalseVariants()
         $this->assertEquals(false, $result);
     }
 
-    public function testBoolDefaultNotBool()
-    {
-        // Shockingly, PHP 7.4 (at least) will not throw a TypeError if a
-        // non-boolean is passed into a function with a bool type. It instead
-        // coerces it into a bool. Maybe later versions will?
-        $this->markTestSkipped('PHP will not enforce a bool type');
-
-        $this->expectException(TypeError::class);
-        $this->expectExceptionMessage("must be of");
-        $default = "string";
-        get_bool_param($this->GET, 'none', $default);
-    }
+    // We don't test passing a non-boolean `$default` to `get_bool_param` as PHP will
+    // automatically coerce it to bool. Also there is no way to disable this behavior.
+    // If there is in the future, we should look at enabling it though.
 
     public function testBoolNotABool()
     {
diff --git a/pinc/misc.inc b/pinc/misc.inc
index 9594dc6c3..688d08c80 100644
--- a/pinc/misc.inc
+++ b/pinc/misc.inc
@@ -809,14 +809,6 @@ function endswith($subject, $suffix)
     return (substr($subject, -strlen($suffix)) == $suffix);
 }
 
-if (!function_exists('str_contains')) {
-    // str_contains() now exists in PHP8
-    function str_contains($haystack, $needle)
-    {
-        return (strpos($haystack, $needle) !== false);
-    }
-}
-
 function surround_and_join($strings, $L, $R, $joiner)
 {
     $parts = [];