diff --git a/tests/SpecTests/ClientSideEncryption/Prose22_RangeExplicitEncryptionTest.php b/tests/SpecTests/ClientSideEncryption/Prose22_RangeExplicitEncryptionTest.php
index 3a5b7dbc9..5b5aea63d 100644
--- a/tests/SpecTests/ClientSideEncryption/Prose22_RangeExplicitEncryptionTest.php
+++ b/tests/SpecTests/ClientSideEncryption/Prose22_RangeExplicitEncryptionTest.php
@@ -20,6 +20,8 @@
 use function file_get_contents;
 use function get_debug_type;
 use function is_int;
+use function phpversion;
+use function version_compare;
 
 /**
  * Prose test 22: Range Explicit Encryption
@@ -39,6 +41,10 @@ public function setUp(): void
     {
         parent::setUp();
 
+        if (version_compare(phpversion('mongodb'), '1.20.0dev', '>=')) {
+            $this->markTestIncomplete('Range protocol V1 is not supported by ext-mongodb 1.20+');
+        }
+
         if ($this->isStandalone()) {
             $this->markTestSkipped('Range explicit encryption tests require replica sets');
         }
diff --git a/tests/SpecTests/ClientSideEncryptionSpecTest.php b/tests/SpecTests/ClientSideEncryptionSpecTest.php
index 44c311d60..83621635a 100644
--- a/tests/SpecTests/ClientSideEncryptionSpecTest.php
+++ b/tests/SpecTests/ClientSideEncryptionSpecTest.php
@@ -38,9 +38,12 @@
 use function in_array;
 use function iterator_to_array;
 use function json_decode;
+use function phpversion;
 use function sprintf;
 use function str_repeat;
+use function str_starts_with;
 use function substr;
+use function version_compare;
 
 use const JSON_THROW_ON_ERROR;
 
@@ -112,6 +115,7 @@ class ClientSideEncryptionSpecTest extends FunctionalTestCase
         'timeoutMS: timeoutMS applied to listCollections to get collection schema' => 'Not yet implemented (PHPC-1760)',
         'timeoutMS: remaining timeoutMS applied to find to get keyvault data' => 'Not yet implemented (PHPC-1760)',
         'namedKMS: Automatically encrypt and decrypt with a named KMS provider' => 'Not yet implemented (PHPLIB-1328)',
+        'fle2v2-Compact: Compact works' => 'Failing due to bug in libmongocrypt (LIBMONGOCRYPT-699)',
     ];
 
     public function setUp(): void
@@ -163,6 +167,10 @@ public function testClientSideEncryption(stdClass $test, ?array $runOn, array $d
             $this->markTestIncomplete(self::$incompleteTests[$this->dataDescription()]);
         }
 
+        if (str_starts_with($this->dataDescription(), 'fle2v2-Range-') && version_compare(phpversion('mongodb'), '1.20.0dev', '>=')) {
+            $this->markTestIncomplete('Range protocol V1 is not supported by ext-mongodb 1.20+');
+        }
+
         if (isset($runOn)) {
             $this->checkServerRequirements($runOn);
         }