diff --git a/src/Psalm/Internal/Clause.php b/src/Psalm/Internal/Clause.php
index 1e9c7dfbd..797fb5d3f 100644
--- a/src/Psalm/Internal/Clause.php
+++ b/src/Psalm/Internal/Clause.php
@@ -104,7 +104,7 @@ final class Clause implements Stringable
 
             /** @psalm-suppress ImpureFunctionCall */
             $data = serialize($possibility_strings);
-            $this->hash = PHP_VERSION_ID >= 8_01_00 ? hash('xxh128', $data) : hash('md4', $data);
+            $this->hash = hash('xxh128', $data);
         }
 
         $this->possibilities = $possibilities;
diff --git a/src/Psalm/Internal/Fork/PsalmRestarter.php b/src/Psalm/Internal/Fork/PsalmRestarter.php
index 4350badbf..8c1d6bfa5 100644
--- a/src/Psalm/Internal/Fork/PsalmRestarter.php
+++ b/src/Psalm/Internal/Fork/PsalmRestarter.php
@@ -69,7 +69,7 @@ final class PsalmRestarter extends XdebugHandler
 
         $opcache_loaded = extension_loaded('opcache') || extension_loaded('Zend OPcache');
 
-        if (PHP_VERSION_ID >= 8_00_00 && $opcache_loaded) {
+        if ($opcache_loaded) {
             // restart to enable JIT if it's not configured in the optimal way
             $opcache_settings = [
                 'enable_cli' => in_array(ini_get('opcache.enable_cli'), ['1', 'true', true, 1]),
@@ -145,11 +145,11 @@ final class PsalmRestarter extends XdebugHandler
         // if it wasn't loaded then we apparently don't have opcache installed and there's no point trying
         // to tweak it
         // If we're running on 7.4 there's no JIT available
-        if (PHP_VERSION_ID >= 8_00_00 && $opcache_loaded) {
+        if ($opcache_loaded) {
             $additional_options = [
                 '-dopcache.enable_cli=true',
                 '-dopcache.jit_buffer_size=512M',
-                '-dopcache.jit=1205',
+                '-dopcache.jit=tracing',
                 '-dopcache.optimization_level=0x7FFEBFFF',
                 '-dopcache.preload=',
                 '-dopcache.log_verbosity_level=0',
diff --git a/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php b/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
index fd95f55fa..4497963b4 100644
--- a/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
+++ b/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
@@ -210,9 +210,7 @@ final class ReflectorVisitor extends PhpParser\NodeVisitorAbstract implements Fi
                     $classlike_storage->class_implements['stringable'] = 'Stringable';
                 }
 
-                if (PHP_VERSION_ID >= 8_00_00) {
-                    $this->codebase->scanner->queueClassLikeForScanning('Stringable');
-                }
+                $this->codebase->scanner->queueClassLikeForScanning('Stringable');
             }
 
             if (!$this->scan_deep) {
diff --git a/src/Psalm/Internal/Provider/ClassLikeStorageCacheProvider.php b/src/Psalm/Internal/Provider/ClassLikeStorageCacheProvider.php
index c35c5e382..75863abd8 100644
--- a/src/Psalm/Internal/Provider/ClassLikeStorageCacheProvider.php
+++ b/src/Psalm/Internal/Provider/ClassLikeStorageCacheProvider.php
@@ -106,7 +106,7 @@ class ClassLikeStorageCacheProvider
     private function getCacheHash(?string $_unused_file_path, ?string $file_contents): string
     {
         $data = $file_contents ?: $this->modified_timestamps;
-        return PHP_VERSION_ID >= 8_01_00 ? hash('xxh128', $data) : hash('md4', $data);
+        return hash('xxh128', $data);
     }
 
     private function loadFromCache(string $fq_classlike_name_lc, ?string $file_path): ?ClassLikeStorage
@@ -152,7 +152,7 @@ class ClassLikeStorageCacheProvider
 
         $data = $file_path ? strtolower($file_path) . ' ' : '';
         $data .= $fq_classlike_name_lc;
-        $file_path_sha = PHP_VERSION_ID >= 8_01_00 ? hash('xxh128', $data) : hash('md4', $data);
+        $file_path_sha = hash('xxh128', $data);
 
         return $parser_cache_directory
             . DIRECTORY_SEPARATOR
diff --git a/src/Psalm/Internal/Provider/FileStorageCacheProvider.php b/src/Psalm/Internal/Provider/FileStorageCacheProvider.php
index 8419afd80..e766769d7 100644
--- a/src/Psalm/Internal/Provider/FileStorageCacheProvider.php
+++ b/src/Psalm/Internal/Provider/FileStorageCacheProvider.php
@@ -113,7 +113,7 @@ class FileStorageCacheProvider
         // the timestamp is only needed if we don't have file contents
         // as same contents should give same results, independent of when file was modified
         $data = $file_contents ?: $this->modified_timestamps;
-        return PHP_VERSION_ID >= 8_01_00 ? hash('xxh128', $data) : hash('md4', $data);
+        return hash('xxh128', $data);
     }
 
     /**
@@ -157,11 +157,7 @@ class FileStorageCacheProvider
             }
         }
 
-        if (PHP_VERSION_ID >= 8_01_00) {
-            $hash = hash('xxh128', $file_path);
-        } else {
-            $hash = hash('md4', $file_path);
-        }
+        $hash = hash('xxh128', $file_path);
 
         return $parser_cache_directory
             . DIRECTORY_SEPARATOR
diff --git a/src/Psalm/Internal/Provider/ParserCacheProvider.php b/src/Psalm/Internal/Provider/ParserCacheProvider.php
index a54c564f4..2125c190f 100644
--- a/src/Psalm/Internal/Provider/ParserCacheProvider.php
+++ b/src/Psalm/Internal/Provider/ParserCacheProvider.php
@@ -332,11 +332,7 @@ class ParserCacheProvider
 
     private function getParserCacheKey(string $file_path): string
     {
-        if (PHP_VERSION_ID >= 8_01_00) {
-            $hash = hash('xxh128', $file_path);
-        } else {
-            $hash = hash('md4', $file_path);
-        }
+        $hash = hash('xxh128', $file_path);
 
         return $hash . ($this->cache->use_igbinary ? '-igbinary' : '') . '-r';
     }
diff --git a/src/Psalm/Internal/Provider/ProjectCacheProvider.php b/src/Psalm/Internal/Provider/ProjectCacheProvider.php
index 70167aaf5..0a162b94f 100644
--- a/src/Psalm/Internal/Provider/ProjectCacheProvider.php
+++ b/src/Psalm/Internal/Provider/ProjectCacheProvider.php
@@ -84,11 +84,7 @@ class ProjectCacheProvider
                 return true;
             }
 
-            if (PHP_VERSION_ID >= 8_01_00) {
-                $hash = hash('xxh128', $lockfile_contents);
-            } else {
-                $hash = hash('md4', $lockfile_contents);
-            }
+            $hash = hash('xxh128', $lockfile_contents);
         } else {
             $hash = '';
         }
diff --git a/src/Psalm/Internal/Provider/StatementsProvider.php b/src/Psalm/Internal/Provider/StatementsProvider.php
index b171cd645..471632e13 100644
--- a/src/Psalm/Internal/Provider/StatementsProvider.php
+++ b/src/Psalm/Internal/Provider/StatementsProvider.php
@@ -111,11 +111,7 @@ final class StatementsProvider
 
         $config = Config::getInstance();
 
-        if (PHP_VERSION_ID >= 8_01_00) {
-            $file_content_hash = hash('xxh128', $version . $file_contents);
-        } else {
-            $file_content_hash = hash('md4', $version . $file_contents);
-        }
+        $file_content_hash = hash('xxh128', $version . $file_contents);
 
         if (!$this->parser_cache_provider
             || (!$config->isInProjectDirs($file_path) && strpos($file_path, 'vendor'))