diff --git a/ios/Libsodium.mm b/ios/Libsodium.mm
index fbc745de0b351ca6193930a5682e5fa44589e8bf..7f75eaa3e62230435bd634882cdb98cd38ced0b6 100644
--- a/ios/Libsodium.mm
+++ b/ios/Libsodium.mm
@@ -4,6 +4,12 @@
 #import <React/RCTLog.h>
 #import "react-native-libsodium.h"
 
+// Orca: RN 0.88 removed RCTCxxBridge.runtime. Under bridgeless the module's bridge is an
+// RCTBridgeProxy, which still implements -runtime but no longer declares it publicly.
+@protocol OrcaLibsodiumRuntimeProvider
+- (void *)runtime;
+@end
+
 @implementation Libsodium
 
 @synthesize bridge=_bridge;
@@ -13,14 +19,14 @@ RCT_EXPORT_MODULE()
 RCT_EXPORT_BLOCKING_SYNCHRONOUS_METHOD(install) {
 
   RCTLogInfo(@"installing libsodium");
-  RCTCxxBridge *cxxBridge = (RCTCxxBridge *)self.bridge;
-  if (!cxxBridge.runtime) {
-    RCTLogInfo(@"libsodium install failure: no cxx bridge runtime");
+  void *runtime = [(id<OrcaLibsodiumRuntimeProvider>)self.bridge runtime];
+  if (!runtime) {
+    RCTLogInfo(@"libsodium install failure: no bridge runtime");
     return nil;
   }
 
-  RCTLogInfo(@"calling installLibsodium with cxx bridge runtime");
-  ReactNativeLibsodium::installLibsodium(*(facebook::jsi::Runtime *)cxxBridge.runtime);
+  RCTLogInfo(@"calling installLibsodium with bridge runtime");
+  ReactNativeLibsodium::installLibsodium(*(facebook::jsi::Runtime *)runtime);
   return nil;
 }