diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index c372a02a..102812ff 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.5.4"
+  ".": "1.5.5"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86802f9c..51d0f690 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.5.5 (2026-03-27)
+
+Full Changelog: [v1.5.4...v1.5.5](https://github.com/OneBusAway/ruby-sdk/compare/v1.5.4...v1.5.5)
+
+### Bug Fixes
+
+* **internal:** correct multipart form field name encoding ([d1a6306](https://github.com/OneBusAway/ruby-sdk/commit/d1a6306091eedf48a45eacc4240a1650b6ee3d87))
+
 ## 1.5.4 (2026-03-25)
 
 Full Changelog: [v1.5.3...v1.5.4](https://github.com/OneBusAway/ruby-sdk/compare/v1.5.3...v1.5.4)
diff --git a/Gemfile.lock b/Gemfile.lock
index 8dfe631c..f3a89d95 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    onebusaway-sdk (1.5.4)
+    onebusaway-sdk (1.5.5)
       cgi
       connection_pool
 
diff --git a/README.md b/README.md
index 7698d967..0cd96d9a 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "onebusaway-sdk", "~> 1.5.4"
+gem "onebusaway-sdk", "~> 1.5.5"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/onebusaway_sdk/internal/util.rb b/lib/onebusaway_sdk/internal/util.rb
index c078616a..44ea71ce 100644
--- a/lib/onebusaway_sdk/internal/util.rb
+++ b/lib/onebusaway_sdk/internal/util.rb
@@ -571,8 +571,7 @@ def encode_query_params(query)
           y << "Content-Disposition: form-data"
 
           unless key.nil?
-            name = ERB::Util.url_encode(key.to_s)
-            y << "; name=\"#{name}\""
+            y << "; name=\"#{key}\""
           end
 
           case val
diff --git a/lib/onebusaway_sdk/version.rb b/lib/onebusaway_sdk/version.rb
index 51bb4142..0dacccba 100644
--- a/lib/onebusaway_sdk/version.rb
+++ b/lib/onebusaway_sdk/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OnebusawaySDK
-  VERSION = "1.5.4"
+  VERSION = "1.5.5"
 end
diff --git a/scripts/mock b/scripts/mock
index 3732f8e6..58e46285 100755
--- a/scripts/mock
+++ b/scripts/mock
@@ -24,7 +24,7 @@ if [ "$1" == "--daemon" ]; then
   # Pre-install the package so the download doesn't eat into the startup timeout
   npm exec --package=@stdy/cli@0.19.7 -- steady --version
 
-  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-form-array-format=repeat --validator-query-array-format=repeat --validator-form-object-format=brackets --validator-query-object-format=brackets "$URL" &> .stdy.log &
+  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=repeat --validator-form-array-format=repeat --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL" &> .stdy.log &
 
   # Wait for server to come online via health endpoint (max 30s)
   echo -n "Waiting for server"
@@ -48,5 +48,5 @@ if [ "$1" == "--daemon" ]; then
 
   echo
 else
-  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-form-array-format=repeat --validator-query-array-format=repeat --validator-form-object-format=brackets --validator-query-object-format=brackets "$URL"
+  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=repeat --validator-form-array-format=repeat --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL"
 fi
diff --git a/scripts/test b/scripts/test
index db2a338a..d56002e5 100755
--- a/scripts/test
+++ b/scripts/test
@@ -43,7 +43,7 @@ elif ! steady_is_running ; then
   echo -e "To run the server, pass in the path or url of your OpenAPI"
   echo -e "spec to the steady command:"
   echo
-  echo -e "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.19.7 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-form-array-format=repeat --validator-query-array-format=repeat --validator-form-object-format=brackets --validator-query-object-format=brackets${NC}"
+  echo -e "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.19.7 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-query-array-format=repeat --validator-form-array-format=repeat --validator-query-object-format=brackets --validator-form-object-format=brackets${NC}"
   echo
 
   exit 1