diff --git a/pkg/analysis_server/lib/src/analysis_server_abstract.dart b/pkg/analysis_server/lib/src/analysis_server_abstract.dart
index 7724107..cf39073 100644
--- a/pkg/analysis_server/lib/src/analysis_server_abstract.dart
+++ b/pkg/analysis_server/lib/src/analysis_server_abstract.dart
@@ -500,6 +500,7 @@
     } catch (e, st) {
       instrumentationService.logException(e, st);
     }
+    return null;
   }
 
   /// Sends an error notification to the user.
diff --git a/pkg/analysis_server/lib/src/computer/computer_color.dart b/pkg/analysis_server/lib/src/computer/computer_color.dart
index 56352d1..1026b0a 100644
--- a/pkg/analysis_server/lib/src/computer/computer_color.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_color.dart
@@ -173,6 +173,8 @@
       return alpha != null && red != null && green != null && blue != null
           ? _colorValueForComponents(alpha, red, green, blue)
           : null;
+    } else {
+      return null;
     }
   }
 
@@ -187,6 +189,8 @@
     if (name == null && args.isNotEmpty) {
       final arg0 = args[0];
       return arg0 is IntegerLiteral ? arg0.value : null;
+    } else {
+      return null;
     }
   }
 
@@ -208,6 +212,8 @@
         return _getSwatchValue(target, shadeNumber);
       }
     }
+
+    return null;
   }
 
   /// Extracts a specific shade index from a Flutter SwatchColor.
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/convert_to_field_parameter.dart b/pkg/analysis_server/lib/src/services/correction/dart/convert_to_field_parameter.dart
index 447adee..fde8eca 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/convert_to_field_parameter.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/convert_to_field_parameter.dart
@@ -126,6 +126,8 @@
         }
       }
     }
+
+    return null;
   }
 }
 
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart b/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
index 4b1ea14..d51d0a6 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/import_library.dart
@@ -344,6 +344,8 @@
         return parent.declaredElement?.thisType;
       } else if (parent is ExtensionDeclaration) {
         return parent.extendedType.type;
+      } else {
+        return null;
       }
     }
 
@@ -361,6 +363,8 @@
       }
       parent = parent.parent;
     }
+
+    return null;
   }
 
   /// Return an instance of this class that will add an import of `dart:async`.
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/update_sdk_constraints.dart b/pkg/analysis_server/lib/src/services/correction/dart/update_sdk_constraints.dart
index c12a2e2..e3acc88 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/update_sdk_constraints.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/update_sdk_constraints.dart
@@ -77,6 +77,7 @@
         return pubspecFile;
       }
     }
+    return null;
   }
 
   /// Return an instance of this class that will update the SDK constraints to
diff --git a/pkg/analysis_server/lib/src/services/correction/dart/wrap_in_text.dart b/pkg/analysis_server/lib/src/services/correction/dart/wrap_in_text.dart
index 53c87c90..9915a0a 100644
--- a/pkg/analysis_server/lib/src/services/correction/dart/wrap_in_text.dart
+++ b/pkg/analysis_server/lib/src/services/correction/dart/wrap_in_text.dart
@@ -62,6 +62,8 @@
         }
       }
     }
+
+    return null;
   }
 }
 
diff --git a/pkg/analysis_server/lib/src/services/pub/pub_package_service.dart b/pkg/analysis_server/lib/src/services/pub/pub_package_service.dart
index 1db29fd..db78765 100644
--- a/pkg/analysis_server/lib/src/services/pub/pub_package_service.dart
+++ b/pkg/analysis_server/lib/src/services/pub/pub_package_service.dart
@@ -322,6 +322,8 @@
       final json = jsonDecode(contents);
       if (json is Map<String, Object?>) {
         return PackageDetailsCache.fromJson(json);
+      } else {
+        return null;
       }
     } catch (e) {
       _instrumentationService.logError('Error reading pub cache file: $e');
diff --git a/pkg/analysis_server/lib/src/utilities/extensions/ast.dart b/pkg/analysis_server/lib/src/utilities/extensions/ast.dart
index 97ab036..efde1c5 100644
--- a/pkg/analysis_server/lib/src/utilities/extensions/ast.dart
+++ b/pkg/analysis_server/lib/src/utilities/extensions/ast.dart
@@ -71,6 +71,7 @@
         return null;
       }
     }
+    return null;
   }
 
   /// Return this node and all its parents.
diff --git a/pkg/analyzer_cli/analysis_options.yaml b/pkg/analyzer_cli/analysis_options.yaml
index 069c2d2..8d202f9 100644
--- a/pkg/analyzer_cli/analysis_options.yaml
+++ b/pkg/analyzer_cli/analysis_options.yaml
@@ -1,9 +1,8 @@
 include: package:lints/recommended.yaml
 
 analyzer:
-  strong-mode:
-    implicit-casts: false
   language:
+    strict-casts: true
     strict-inference: true
   exclude:
     - test/data/**
diff --git a/pkg/analyzer_plugin/analysis_options.yaml b/pkg/analyzer_plugin/analysis_options.yaml
index c183e26..a8cb96f 100644
--- a/pkg/analyzer_plugin/analysis_options.yaml
+++ b/pkg/analyzer_plugin/analysis_options.yaml
@@ -1,6 +1,6 @@
 analyzer:
-  strong-mode:
-    implicit-casts: false
+  language:
+    strict-casts: true
 linter:
   rules:
     - await_only_futures
diff --git a/tools/VERSION b/tools/VERSION
index 527e3b1..4eebc0d 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 16
 PATCH 0
-PRERELEASE 88
+PRERELEASE 89
 PRERELEASE_PATCH 0
\ No newline at end of file