diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index c9ba664..f1ce3b3 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.11.1"
+  ".": "2.11.2"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8181a45..6aa9529 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 2.11.2 (2026-04-01)
+
+Full Changelog: [v2.11.1...v2.11.2](https://github.com/moderation-api/sdk-ruby/compare/v2.11.1...v2.11.2)
+
+### Bug Fixes
+
+* align path encoding with RFC 3986 section 3.3 ([8562b22](https://github.com/moderation-api/sdk-ruby/commit/8562b22361b7f7c6db74a58f8d78f25e435bed3d))
+
 ## 2.11.1 (2026-04-01)
 
 Full Changelog: [v2.11.0...v2.11.1](https://github.com/moderation-api/sdk-ruby/compare/v2.11.0...v2.11.1)
diff --git a/Gemfile.lock b/Gemfile.lock
index 4c7d6f4..40db1b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    moderation_api (2.11.1)
+    moderation_api (2.11.2)
       cgi
       connection_pool
 
diff --git a/README.md b/README.md
index aebc83b..b9e6585 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "moderation_api", "~> 2.11.1"
+gem "moderation_api", "~> 2.11.2"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/moderation_api/internal/util.rb b/lib/moderation_api/internal/util.rb
index e2f91a9..382526b 100644
--- a/lib/moderation_api/internal/util.rb
+++ b/lib/moderation_api/internal/util.rb
@@ -237,6 +237,11 @@ def dig(data, pick, &blk)
         end
       end
 
+      # @type [Regexp]
+      #
+      # https://www.rfc-editor.org/rfc/rfc3986.html#section-3.3
+      RFC_3986_NOT_PCHARS = /[^A-Za-z0-9\-._~!$&'()*+,;=:@]+/
+
       class << self
         # @api private
         #
@@ -247,6 +252,15 @@ def uri_origin(uri)
           "#{uri.scheme}://#{uri.host}#{":#{uri.port}" unless uri.port == uri.default_port}"
         end
 
+        # @api private
+        #
+        # @param path [String, Integer]
+        #
+        # @return [String]
+        def encode_path(path)
+          path.to_s.gsub(ModerationAPI::Internal::Util::RFC_3986_NOT_PCHARS) { ERB::Util.url_encode(_1) }
+        end
+
         # @api private
         #
         # @param path [String, Array<String>]
@@ -259,7 +273,7 @@ def interpolate_path(path)
           in []
             ""
           in [String => p, *interpolations]
-            encoded = interpolations.map { ERB::Util.url_encode(_1) }
+            encoded = interpolations.map { encode_path(_1) }
             format(p, *encoded)
           end
         end
@@ -576,10 +590,10 @@ def encode_query_params(query)
 
           case val
           in ModerationAPI::FilePart unless val.filename.nil?
-            filename = ERB::Util.url_encode(val.filename)
+            filename = encode_path(val.filename)
             y << "; filename=\"#{filename}\""
           in Pathname | IO
-            filename = ERB::Util.url_encode(::File.basename(val.to_path))
+            filename = encode_path(::File.basename(val.to_path))
             y << "; filename=\"#{filename}\""
           else
           end
diff --git a/lib/moderation_api/version.rb b/lib/moderation_api/version.rb
index 508ede8..86d149a 100644
--- a/lib/moderation_api/version.rb
+++ b/lib/moderation_api/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module ModerationAPI
-  VERSION = "2.11.1"
+  VERSION = "2.11.2"
 end
diff --git a/rbi/moderation_api/internal/util.rbi b/rbi/moderation_api/internal/util.rbi
index 847a249..9acf9e1 100644
--- a/rbi/moderation_api/internal/util.rbi
+++ b/rbi/moderation_api/internal/util.rbi
@@ -148,12 +148,20 @@ module ModerationAPI
         end
       end
 
+      # https://www.rfc-editor.org/rfc/rfc3986.html#section-3.3
+      RFC_3986_NOT_PCHARS = T.let(/[^A-Za-z0-9\-._~!$&'()*+,;=:@]+/, Regexp)
+
       class << self
         # @api private
         sig { params(uri: URI::Generic).returns(String) }
         def uri_origin(uri)
         end
 
+        # @api private
+        sig { params(path: T.any(String, Integer)).returns(String) }
+        def encode_path(path)
+        end
+
         # @api private
         sig { params(path: T.any(String, T::Array[String])).returns(String) }
         def interpolate_path(path)
diff --git a/sig/moderation_api/internal/util.rbs b/sig/moderation_api/internal/util.rbs
index cc943cf..4c8bbf9 100644
--- a/sig/moderation_api/internal/util.rbs
+++ b/sig/moderation_api/internal/util.rbs
@@ -45,8 +45,12 @@ module ModerationAPI
         -> top?
       } -> top?
 
+      RFC_3986_NOT_PCHARS: Regexp
+
       def self?.uri_origin: (URI::Generic uri) -> String
 
+      def self?.encode_path: (String | Integer path) -> String
+
       def self?.interpolate_path: (String | ::Array[String] path) -> String
 
       def self?.decode_query: (String? query) -> ::Hash[String, ::Array[String]]