diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 60b11b0..9fc044e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -61,14 +61,18 @@ jobs:
         run: rye build
 
       - name: Get GitHub OIDC Token
-        if: github.repository == 'stainless-sdks/zeroentropy-python'
+        if: |-
+          github.repository == 'stainless-sdks/zeroentropy-python' &&
+          !startsWith(github.ref, 'refs/heads/stl/')
         id: github-oidc
         uses: actions/github-script@v8
         with:
           script: core.setOutput('github_token', await core.getIDToken());
 
       - name: Upload tarball
-        if: github.repository == 'stainless-sdks/zeroentropy-python'
+        if: |-
+          github.repository == 'stainless-sdks/zeroentropy-python' &&
+          !startsWith(github.ref, 'refs/heads/stl/')
         env:
           URL: https://pkg.stainless.com/s
           AUTH: ${{ steps.github-oidc.outputs.github_token }}
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index ee49ac2..fd0ccba 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.11"
+  ".": "0.1.0-alpha.12"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 54812b2..f134db9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.1.0-alpha.12 (2026-03-07)
+
+Full Changelog: [v0.1.0-alpha.11...v0.1.0-alpha.12](https://github.com/zeroentropy-ai/zeroentropy-python/compare/v0.1.0-alpha.11...v0.1.0-alpha.12)
+
+### Chores
+
+* **ci:** skip uploading artifacts on stainless-internal branches ([d6bb8a8](https://github.com/zeroentropy-ai/zeroentropy-python/commit/d6bb8a8306064729e4739209011106a6cc5e224f))
+* **test:** do not count install time for mock server timeout ([ed8f79f](https://github.com/zeroentropy-ai/zeroentropy-python/commit/ed8f79f5b4c05cde5e12eb4c6a8137cc6b7dde74))
+
 ## 0.1.0-alpha.11 (2026-03-03)
 
 Full Changelog: [v0.1.0-alpha.10...v0.1.0-alpha.11](https://github.com/zeroentropy-ai/zeroentropy-python/compare/v0.1.0-alpha.10...v0.1.0-alpha.11)
diff --git a/pyproject.toml b/pyproject.toml
index 729d5d1..fe845b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "zeroentropy"
-version = "0.1.0-alpha.11"
+version = "0.1.0-alpha.12"
 description = "The official Python library for the ZeroEntropy API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/scripts/mock b/scripts/mock
index 0b28f6e..bcf3b39 100755
--- a/scripts/mock
+++ b/scripts/mock
@@ -21,11 +21,22 @@ echo "==> Starting mock server with URL ${URL}"
 
 # Run prism mock on the given spec
 if [ "$1" == "--daemon" ]; then
+  # Pre-install the package so the download doesn't eat into the startup timeout
+  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism --version
+
   npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL" &> .prism.log &
 
-  # Wait for server to come online
+  # Wait for server to come online (max 30s)
   echo -n "Waiting for server"
+  attempts=0
   while ! grep -q "✖  fatal\|Prism is listening" ".prism.log" ; do
+    attempts=$((attempts + 1))
+    if [ "$attempts" -ge 300 ]; then
+      echo
+      echo "Timed out waiting for Prism server to start"
+      cat .prism.log
+      exit 1
+    fi
     echo -n "."
     sleep 0.1
   done
diff --git a/src/zeroentropy/_version.py b/src/zeroentropy/_version.py
index 5361556..933f906 100644
--- a/src/zeroentropy/_version.py
+++ b/src/zeroentropy/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "zeroentropy"
-__version__ = "0.1.0-alpha.11"  # x-release-please-version
+__version__ = "0.1.0-alpha.12"  # x-release-please-version