diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa08d79..08100c4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
   lint:
     timeout-minutes: 10
     name: lint
-    runs-on: ${{ github.repository == 'stainless-sdks/steel-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
+    runs-on: ${{ startsWith(github.repository, 'stainless-sdks/') && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -44,7 +44,7 @@ jobs:
     permissions:
       contents: read
       id-token: write
-    runs-on: ${{ github.repository == 'stainless-sdks/steel-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
+    runs-on: ${{ startsWith(github.repository, 'stainless-sdks/') && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
@@ -84,7 +84,7 @@ jobs:
   test:
     timeout-minutes: 10
     name: test
-    runs-on: ${{ github.repository == 'stainless-sdks/steel-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
+    runs-on: ${{ startsWith(github.repository, 'stainless-sdks/') && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e756293..0c2ecec 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.19.0"
+  ".": "0.20.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 1107fef..236afc9 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 39
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/nen-labs/steel-7dfdbffbc4a1b1f44637815cabdc6831ab00a3bbf5157cec73107b5f9d6be8df.yml
-openapi_spec_hash: 8d63332328e084a1f1be8d643ceaa685
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/nen-labs/steel-ce5d1b98232bff8090133e02e6421e8d559fed0386f9c83f3ad501ca173527aa.yml
+openapi_spec_hash: aba12d36d6d1be379bee50d4d9545247
 config_hash: dce4dea59023b0a00890fa654fbfffb4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 579fc6c..f8b2146 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## 0.20.0 (2026-08-20)
+
+Full Changelog: [v0.19.0...v0.20.0](https://github.com/steel-dev/steel-python/compare/v0.19.0...v0.20.0)
+
+### Features
+
+* **api:** api update ([879f6dc](https://github.com/steel-dev/steel-python/commit/879f6dcfb4d245beee7b46a75d4701193d91fb58))
+* **stlc:** configurable CI runner and private-production-repo support in workflow templates ([837c9ae](https://github.com/steel-dev/steel-python/commit/837c9ae8c741960dc8fac522a738fc352124da93))
+
+
+### Chores
+
+* **internal:** allow the mock server port to be set with STAINLESS_MOCK_PORT ([213dcea](https://github.com/steel-dev/steel-python/commit/213dcea7ab877262c656780e437ea9ce44c68331))
+
 ## 0.19.0 (2026-06-23)
 
 Full Changelog: [v0.18.0...v0.19.0](https://github.com/steel-dev/steel-python/compare/v0.18.0...v0.19.0)
diff --git a/pyproject.toml b/pyproject.toml
index 4ecb2fe..800c788 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "steel-sdk"
-version = "0.19.0"
+version = "0.20.0"
 description = "The official Python library for the steel API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/scripts/mock b/scripts/mock
index feebe5e..984e1c0 100755
--- a/scripts/mock
+++ b/scripts/mock
@@ -4,6 +4,11 @@ set -e
 
 cd "$(dirname "$0")/.."
 
+if [ "$1" == "--install" ]; then
+  npm exec --package=@stdy/cli@0.22.1 -- steady --version
+  exit 0
+fi
+
 if [[ -n "$1" && "$1" != '--'* ]]; then
   URL="$1"
   shift
@@ -20,16 +25,18 @@ fi
 echo "==> Starting mock server with URL ${URL}"
 
 # Run steady mock on the given spec
+MOCK_PORT="${STAINLESS_MOCK_PORT:-4010}"
+
 if [ "$1" == "--daemon" ]; then
   # Pre-install the package so the download doesn't eat into the startup timeout
   npm exec --package=@stdy/cli@0.22.1 -- steady --version
 
-  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL" &> .stdy.log &
+  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p "$MOCK_PORT" --validator-query-array-format=comma --validator-form-array-format=comma --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"
   attempts=0
-  while ! curl --silent --fail "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1; do
+  while ! curl --silent --fail "http://127.0.0.1:$MOCK_PORT/_x-steady/health" >/dev/null 2>&1; do
     if ! kill -0 $! 2>/dev/null; then
       echo
       cat .stdy.log
@@ -48,5 +55,5 @@ if [ "$1" == "--daemon" ]; then
 
   echo
 else
-  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL"
+  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p "$MOCK_PORT" --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL"
 fi
diff --git a/scripts/test b/scripts/test
index 19acc91..9dbb5cd 100755
--- a/scripts/test
+++ b/scripts/test
@@ -9,8 +9,10 @@ GREEN='\033[0;32m'
 YELLOW='\033[0;33m'
 NC='\033[0m' # No Color
 
+MOCK_PORT="${STAINLESS_MOCK_PORT:-4010}"
+
 function steady_is_running() {
-  curl --silent "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1
+  curl --silent "http://127.0.0.1:$MOCK_PORT/_x-steady/health" >/dev/null 2>&1
 }
 
 kill_server_on_port() {
@@ -27,7 +29,7 @@ function is_overriding_api_base_url() {
 
 if ! is_overriding_api_base_url && ! steady_is_running ; then
   # When we exit this script, make sure to kill the background mock server process
-  trap 'kill_server_on_port 4010' EXIT
+  trap 'kill_server_on_port "$MOCK_PORT"' EXIT
 
   # Start the dev server
   ./scripts/mock --daemon
@@ -43,7 +45,7 @@ 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 "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.22.1 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets${NC}"
+  echo -e "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.22.1 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p $MOCK_PORT --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets${NC}"
   echo
 
   exit 1
@@ -52,6 +54,10 @@ else
   echo
 fi
 
+if [ -n "${STAINLESS_MOCK_PORT:-}" ] && ! is_overriding_api_base_url ; then
+  export TEST_API_BASE_URL="http://127.0.0.1:$MOCK_PORT"
+fi
+
 export DEFER_PYDANTIC_BUILD=false
 
 echo "==> Running tests"
diff --git a/src/steel/_version.py b/src/steel/_version.py
index c951ee8..1f5d3f3 100644
--- a/src/steel/_version.py
+++ b/src/steel/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "steel"
-__version__ = "0.19.0"  # x-release-please-version
+__version__ = "0.20.0"  # x-release-please-version
diff --git a/src/steel/types/session.py b/src/steel/types/session.py
index b5b6150..24aacb7 100644
--- a/src/steel/types/session.py
+++ b/src/steel/types/session.py
@@ -87,6 +87,9 @@ class Session(BaseModel):
     id: str
     """Unique identifier for the session"""
 
+    browser_mode: Literal["stealth", "standard", "unknown"] = FieldInfo(alias="browserMode")
+    """Browser mode used for this session."""
+
     created_at: datetime = FieldInfo(alias="createdAt")
     """Timestamp when the session started"""
 
@@ -159,24 +162,7 @@ class Session(BaseModel):
     project_id: Optional[str] = FieldInfo(alias="projectId", default=None)
     """The project associated with the session"""
 
-    region: Optional[
-        Literal[
-            "lax",
-            "ord",
-            "iad",
-            "scl",
-            "fra",
-            "nrt",
-            "us-east",
-            "us-west",
-            "us-central",
-            "eu-west",
-            "eu-central",
-            "ap-northeast",
-            "ap-southeast",
-            "sa-east",
-        ]
-    ] = None
+    region: Optional[str] = None
     """The region where the session was created."""
 
     release_reason: Optional[
diff --git a/src/steel/types/sessionslist.py b/src/steel/types/sessionslist.py
index 90ba256..b6a4ae3 100644
--- a/src/steel/types/sessionslist.py
+++ b/src/steel/types/sessionslist.py
@@ -95,6 +95,9 @@ class Session(BaseModel):
     id: str
     """Unique identifier for the session"""
 
+    browser_mode: Literal["stealth", "standard", "unknown"] = FieldInfo(alias="browserMode")
+    """Browser mode used for this session."""
+
     created_at: datetime = FieldInfo(alias="createdAt")
     """Timestamp when the session started"""
 
@@ -167,24 +170,7 @@ class Session(BaseModel):
     project_id: Optional[str] = FieldInfo(alias="projectId", default=None)
     """The project associated with the session"""
 
-    region: Optional[
-        Literal[
-            "lax",
-            "ord",
-            "iad",
-            "scl",
-            "fra",
-            "nrt",
-            "us-east",
-            "us-west",
-            "us-central",
-            "eu-west",
-            "eu-central",
-            "ap-northeast",
-            "ap-southeast",
-            "sa-east",
-        ]
-    ] = None
+    region: Optional[str] = None
     """The region where the session was created."""
 
     release_reason: Optional[