diff --git a/.github/workflows/create-releases.yml b/.github/workflows/create-releases.yml
index c6f6461..f76bebb 100644
--- a/.github/workflows/create-releases.yml
+++ b/.github/workflows/create-releases.yml
@@ -18,17 +18,3 @@ jobs:
         with:
           repo: ${{ github.event.repository.full_name }}
           stainless-api-key: ${{ secrets.STAINLESS_API_KEY }}
-
-      - name: Set up Python
-        if: ${{ steps.release.outputs.releases_created }}
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.7'
-
-      - name: Publish to PyPI
-        if: ${{ steps.release.outputs.releases_created }}
-        run: |
-          pipx install poetry
-          bash ./bin/publish-pypi
-        env:
-          PYPI_TOKEN: ${{ secrets.ANTHROPIC_BEDROCK_PYPI_TOKEN }}
diff --git a/.github/workflows/publish-pypi.yml b/.github/workflows/publish-pypi.yml
deleted file mode 100644
index db986f1..0000000
--- a/.github/workflows/publish-pypi.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-# workflow for re-running publishing to PyPI in case it fails for some reason
-# you can run this workflow by navigating to https://www.github.com/anthropics/anthropic-bedrock-python/actions/workflows/publish-pypi.yml
-name: Publish PyPI
-on:
-  workflow_dispatch:
-
-jobs:
-  publish:
-    name: publish
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.7'
-
-      - name: Publish to PyPI
-        run: |
-          pipx install poetry
-          bash ./bin/publish-pypi
-        env:
-          PYPI_TOKEN: ${{ secrets.ANTHROPIC_BEDROCK_PYPI_TOKEN }}
diff --git a/.github/workflows/release-doctor.yml b/.github/workflows/release-doctor.yml
index 1b99db6..744bb4a 100644
--- a/.github/workflows/release-doctor.yml
+++ b/.github/workflows/release-doctor.yml
@@ -17,4 +17,3 @@ jobs:
           bash ./bin/check-release-environment
         env:
           STAINLESS_API_KEY: ${{ secrets.STAINLESS_API_KEY }}
-          PYPI_TOKEN: ${{ secrets.ANTHROPIC_BEDROCK_PYPI_TOKEN }}
diff --git a/bin/check-release-environment b/bin/check-release-environment
index 343b7a7..d639b0c 100644
--- a/bin/check-release-environment
+++ b/bin/check-release-environment
@@ -6,10 +6,6 @@ if [ -z "${STAINLESS_API_KEY}" ]; then
   errors+=("The STAINLESS_API_KEY secret has not been set. Please contact Stainless for an API key & set it in your organisation secrets on GitHub.")
 fi
 
-if [ -z "${PYPI_TOKEN}" ]; then
-  errors+=("The ANTHROPIC_BEDROCK_PYPI_TOKEN secret has not been set. Please set it in either this repository's secrets or your organisation secrets.")
-fi
-
 len=${#errors[@]}
 
 if [[ len -gt 0 ]]; then
diff --git a/release-please-config.json b/release-please-config.json
index a5a7752..18404cc 100644
--- a/release-please-config.json
+++ b/release-please-config.json
@@ -57,9 +57,6 @@
       "hidden": true
     }
   ],
-  "reviewers": [
-    "@anthropics/sdk"
-  ],
   "release-type": "python",
   "extra-files": [
     "src/anthropic_bedrock/_version.py"
diff --git a/src/anthropic_bedrock/_client.py b/src/anthropic_bedrock/_client.py
index 47d2de6..d1bc0d2 100644
--- a/src/anthropic_bedrock/_client.py
+++ b/src/anthropic_bedrock/_client.py
@@ -81,14 +81,20 @@ def __init__(
 
         This automatically infers the `aws_region` argument from the `AWS_REGION` environment variable if it is not provided.
         """
+        if aws_secret_key is None:
+            aws_secret_key = None
         self.aws_secret_key = aws_secret_key
 
+        if aws_access_key is None:
+            aws_access_key = None
         self.aws_access_key = aws_access_key
 
         if aws_region is None:
             aws_region = os.environ.get("AWS_REGION") or "us-east-1"
         self.aws_region = aws_region
 
+        if aws_session_token is None:
+            aws_session_token = None
         self.aws_session_token = aws_session_token
 
         if base_url is None:
@@ -285,14 +291,20 @@ def __init__(
 
         This automatically infers the `aws_region` argument from the `AWS_REGION` environment variable if it is not provided.
         """
+        if aws_secret_key is None:
+            aws_secret_key = None
         self.aws_secret_key = aws_secret_key
 
+        if aws_access_key is None:
+            aws_access_key = None
         self.aws_access_key = aws_access_key
 
         if aws_region is None:
             aws_region = os.environ.get("AWS_REGION") or "us-east-1"
         self.aws_region = aws_region
 
+        if aws_session_token is None:
+            aws_session_token = None
         self.aws_session_token = aws_session_token
 
         if base_url is None: