diff --git a/Gemfile.lock b/Gemfile.lock
index d5600e09..827baa7b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -37,9 +37,9 @@ GEM
     connection_pool (2.4.1)
     crack (0.4.5)
       rexml
-    diff-lcs (1.5.0)
     drb (2.2.0)
       ruby2_keywords
+    erubi (1.12.0)
     fakefs (1.4.1)
     hash_diff (1.1.1)
     hashdiff (1.0.1)
@@ -60,25 +60,25 @@ GEM
     oj (3.16.3)
       bigdecimal (>= 3.0)
     openssl (3.2.0)
-    parallel (1.22.1)
-    parser (3.2.2.4)
+    parallel (1.24.0)
+    parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
-    pry (0.14.1)
+    prettier_print (1.2.1)
+    prism (0.21.0)
+    pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
     pry-byebug (3.10.1)
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     public_suffix (4.0.6)
-    racc (1.7.1)
+    racc (1.7.3)
     rainbow (3.1.1)
     rake (13.0.6)
-    rbi (0.0.15)
-      ast
-      parser (>= 2.6.4.0)
+    rbi (0.1.8)
+      prism (>= 0.18.0, < 0.22)
       sorbet-runtime (>= 0.5.9204)
-      unparser
     regexp_parser (2.5.0)
     rexml (3.2.5)
     rubocop (1.36.0)
@@ -100,44 +100,40 @@ GEM
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
     securerandom (0.3.1)
-    sorbet (0.5.10438)
-      sorbet-static (= 0.5.10438)
-    sorbet-runtime (0.5.10438)
-    sorbet-static (0.5.10438-universal-darwin-21)
-    sorbet-static (0.5.10438-universal-darwin-22)
-    sorbet-static (0.5.10438-x86_64-linux)
-    sorbet-static-and-runtime (0.5.10438)
-      sorbet (= 0.5.10438)
-      sorbet-runtime (= 0.5.10438)
-    spoom (1.1.11)
-      sorbet (>= 0.5.9204)
-      sorbet-runtime (>= 0.5.9204)
+    sorbet (0.5.11230)
+      sorbet-static (= 0.5.11230)
+    sorbet-runtime (0.5.11230)
+    sorbet-static (0.5.11230-universal-darwin)
+    sorbet-static (0.5.11230-x86_64-linux)
+    sorbet-static-and-runtime (0.5.11230)
+      sorbet (= 0.5.11230)
+      sorbet-runtime (= 0.5.11230)
+    spoom (1.2.4)
+      erubi (>= 1.10.0)
+      sorbet-static-and-runtime (>= 0.5.10187)
+      syntax_tree (>= 6.1.1)
       thor (>= 0.19.2)
-    tapioca (0.10.2)
-      bundler (>= 1.17.3)
+    syntax_tree (6.2.0)
+      prettier_print (>= 1.2.0)
+    tapioca (0.12.0)
+      bundler (>= 2.2.25)
       netrc (>= 0.11.0)
       parallel (>= 1.21.0)
-      pry (>= 0.12.2)
-      rbi (~> 0.0.0, >= 0.0.14)
-      sorbet-static-and-runtime (>= 0.5.9204)
-      spoom (~> 1.1.0, >= 1.1.11)
+      rbi (>= 0.1.4, < 0.2)
+      sorbet-static-and-runtime (>= 0.5.10820)
+      spoom (~> 1.2.0, >= 1.2.0)
       thor (>= 1.2.0)
       yard-sorbet
-    thor (1.2.1)
+    thor (1.3.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.3.0)
-    unparser (0.6.5)
-      diff-lcs (~> 1.3)
-      parser (>= 3.1.0)
     webmock (3.14.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webrick (1.7.0)
-    yard (0.9.28)
-      webrick (~> 1.7.0)
-    yard-sorbet (0.7.0)
+    yard (0.9.34)
+    yard-sorbet (0.8.1)
       sorbet-runtime (>= 0.5)
       yard (>= 0.9)
     zeitwerk (2.6.12)
diff --git a/lib/shopify_api/logger.rb b/lib/shopify_api/logger.rb
index a2e5d7f3..0f29687f 100644
--- a/lib/shopify_api/logger.rb
+++ b/lib/shopify_api/logger.rb
@@ -75,7 +75,7 @@ def enabled_for_log_level?(log_level)
       def valid_version(version)
         current_version = Gem::Version.create(ShopifyAPI::VERSION)
         deprecate_version = Gem::Version.create(version)
-        current_version < deprecate_version
+        T.must(current_version) < deprecate_version
       end
     end
   end
diff --git a/lib/shopify_api/rest/base.rb b/lib/shopify_api/rest/base.rb
index 46b89de1..1d94f290 100644
--- a/lib/shopify_api/rest/base.rb
+++ b/lib/shopify_api/rest/base.rb
@@ -13,6 +13,8 @@ class Base
 
       @has_one = T.let({}, T::Hash[Symbol, Class])
       @has_many = T.let({}, T::Hash[Symbol, Class])
+      @has_one = T.let({}, T::Hash[Symbol, T::Class[T.anything]])
+      @has_many = T.let({}, T::Hash[Symbol, T::Class[T.anything]])
       @paths = T.let([], T::Array[T::Hash[Symbol, T.any(T::Array[Symbol], String, Symbol)]])
       @custom_prefix = T.let(nil, T.nilable(String))
       @read_only_attributes = T.let([], T.nilable(T::Array[Symbol]))
@@ -55,10 +57,10 @@ class << self
         sig { returns(T.nilable(String)) }
         attr_reader :custom_prefix
 
-        sig { returns(T::Hash[Symbol, Class]) }
+        sig { returns(T::Hash[Symbol, T::Class[T.anything]]) }
         attr_reader :has_many
 
-        sig { returns(T::Hash[Symbol, Class]) }
+        sig { returns(T::Hash[Symbol, T::Class[T.anything]]) }
         attr_reader :has_one
 
         sig do
@@ -440,7 +442,7 @@ def get_property(key)
       sig do
         params(
           element: T.nilable(T.any(T::Hash[String, T.untyped], ShopifyAPI::Rest::Base)),
-          attribute_class: Class,
+          attribute_class: T::Class[T.anything],
           saving: T::Boolean,
         ).returns(T.nilable(T::Hash[String, T.untyped]))
       end
diff --git a/lib/shopify_api/utils/hmac_validator.rb b/lib/shopify_api/utils/hmac_validator.rb
index c8b3808e..76e2f47b 100644
--- a/lib/shopify_api/utils/hmac_validator.rb
+++ b/lib/shopify_api/utils/hmac_validator.rb
@@ -27,7 +27,7 @@ def validate(verifiable_query)
         def validate_signature(verifiable_query, secret)
           received_signature = verifiable_query.hmac
           computed_signature = compute_signature(verifiable_query.to_signable_string, secret)
-          OpenSSL.secure_compare(computed_signature, received_signature)
+          OpenSSL.secure_compare(computed_signature, T.must(received_signature))
         end
 
         sig { params(signable_string: String, secret: String).returns(String) }
diff --git a/test/test_helpers/fake_resource.rb b/test/test_helpers/fake_resource.rb
index f9622ed0..f2ede71e 100644
--- a/test/test_helpers/fake_resource.rb
+++ b/test/test_helpers/fake_resource.rb
@@ -7,11 +7,11 @@ class FakeResource < ShopifyAPI::Rest::Base
 
     @has_one = T.let({
       has_one_attribute: FakeResource,
-    }, T::Hash[Symbol, Class])
+    }, T::Hash[Symbol, T::Class[T.anything]])
 
     @has_many = T.let({
       has_many_attribute: FakeResource,
-    }, T::Hash[Symbol, Class])
+    }, T::Hash[Symbol, T::Class[T.anything]])
 
     @prev_page_info = T.let(Concurrent::ThreadLocalVar.new { nil }, Concurrent::ThreadLocalVar)
     @next_page_info = T.let(Concurrent::ThreadLocalVar.new { nil }, Concurrent::ThreadLocalVar)
diff --git a/test/test_helpers/fake_resource_with_custom_prefix.rb b/test/test_helpers/fake_resource_with_custom_prefix.rb
index 810f95e8..d4e25f6f 100644
--- a/test/test_helpers/fake_resource_with_custom_prefix.rb
+++ b/test/test_helpers/fake_resource_with_custom_prefix.rb
@@ -10,8 +10,8 @@ class FakeResourceWithCustomPrefix < ShopifyAPI::Rest::Base
     @api_call_limit = T.let(Concurrent::ThreadLocalVar.new { nil }, Concurrent::ThreadLocalVar)
     @retry_request_after = T.let(Concurrent::ThreadLocalVar.new { nil }, Concurrent::ThreadLocalVar)
 
-    @has_one = T.let({}, T::Hash[Symbol, Class])
-    @has_many = T.let({}, T::Hash[Symbol, Class])
+    @has_one = T.let({}, T::Hash[Symbol, T::Class[T.anything]])
+    @has_many = T.let({}, T::Hash[Symbol, T::Class[T.anything]])
     @paths = T.let([
       { http_method: :get, operation: :get, ids: [:id], path: "fake_resource_with_custom_prefix/<id>.json" },
     ], T::Array[T::Hash[String, T.any(T::Array[Symbol], String, Symbol)]])