diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index c99d7f7bd..93b246ab8 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -36,7 +36,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Build the distribution
         id: build
         run: nox -vs build
@@ -79,7 +79,7 @@ jobs:
         run: |
           sudo apt-get -y update
           sudo apt-get -y install patchelf scons
-          python -m pip install --upgrade nox pdm
+          python -m pip install --upgrade nox pdm==2.26.2
           git config --global --add safe.directory '*'
       - name: Bundle the distribution
         id: bundle
@@ -114,7 +114,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Bundle the distribution
         id: bundle
         shell: bash
@@ -159,7 +159,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Build Dockerfile
         run: nox -vs generate_dockerfile
       - name: Set up QEMU
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 059f00d11..0aefc4b9b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Run linters
         run: nox -vs lint
       - name: Validate new changelog entries
@@ -47,7 +47,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Build the distribution
         run: nox -vs build
   cleanup_buckets:
@@ -70,7 +70,7 @@ jobs:
           cache: "pip"
       - name: Install dependencies
         if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}  # TODO: skip this whole job instead
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Find and remove old buckets
         if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}  # TODO: skip this whole job instead
         run: nox -vs cleanup_buckets
@@ -111,7 +111,7 @@ jobs:
         run: |
           brew install fish
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Run unit tests
         run: nox -vs unit -p ${{ matrix.python-version }}
       - name: Run integration tests (without secrets)
@@ -137,7 +137,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Generate Dockerfile
         run: nox -vs generate_dockerfile
       - name: Set up QEMU
@@ -178,7 +178,7 @@ jobs:
         run: |
           sudo apt-get -y update
           sudo apt-get -y install patchelf scons
-          python -m pip install --upgrade nox pdm
+          python -m pip install --upgrade nox pdm==2.26.2
           git config --global --add safe.directory '*'
       - name: Bundle the distribution
         id: bundle
@@ -217,7 +217,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm
+        run: python -m pip install --upgrade nox pdm==2.26.2
       - name: Bundle the distribution
         id: bundle
         shell: bash
@@ -256,6 +256,6 @@ jobs:
         run: |
           sudo apt-get update -y
           sudo apt-get install -y graphviz plantuml
-          python -m pip install --upgrade nox pdm
+          python -m pip install --upgrade nox pdm==2.26.2
       - name: Build the docs
         run: nox --non-interactive -vs doc
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76c621cd6..b907c1145 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,25 @@ upcoming release can be found in [changelog.d](changelog.d).
 
 <!-- towncrier release notes start -->
 
+## [4.5.0](https://github.com/Backblaze/B2_Command_Line_Tool/releases/tag/v4.5.0) - 2026-01-08
+
+
+### Removed
+
+- Dropped support for python 3.8.
+
+### Fixed
+
+- Fixed SystemError buffer overflow crash on Python 3.14+ caused by rst2ansi's terminal size detection bug. The CLI now gracefully handles this error and continues to function normally. ([#1119](https://github.com/Backblaze/B2_Command_Line_Tool/issues/1119))
+- Disable Tqdm semaphore leak workaround for MacOS >= 15.7.2, as apparently it is no longer an issue in newer versions.
+
+### Infrastructure
+
+- Added Python 3.14 support to CI/CD pipeline and test matrix.
+- Update CI to not use deprecated `macos-13` runner.
+- Use b2sdk pytest plugin and utilities in tests.
+
+
 ## [4.4.2](https://github.com/Backblaze/B2_Command_Line_Tool/releases/tag/v4.4.2) - 2025-09-10
 
 
diff --git a/changelog.d/+b2sdk_testing.infrastructure.md b/changelog.d/+b2sdk_testing.infrastructure.md
deleted file mode 100644
index 65e5b6164..000000000
--- a/changelog.d/+b2sdk_testing.infrastructure.md
+++ /dev/null
@@ -1 +0,0 @@
-Use b2sdk pytest plugin and utilities in tests.
\ No newline at end of file
diff --git a/changelog.d/+macos-13-deprecated.infrastructure.md b/changelog.d/+macos-13-deprecated.infrastructure.md
deleted file mode 100644
index 9bbece518..000000000
--- a/changelog.d/+macos-13-deprecated.infrastructure.md
+++ /dev/null
@@ -1 +0,0 @@
-Update CI to not use deprecated `macos-13` runner.
diff --git a/changelog.d/+python-3.14-support.infrastructure.md b/changelog.d/+python-3.14-support.infrastructure.md
deleted file mode 100644
index e803e754c..000000000
--- a/changelog.d/+python-3.14-support.infrastructure.md
+++ /dev/null
@@ -1 +0,0 @@
-Added Python 3.14 support to CI/CD pipeline and test matrix.
\ No newline at end of file
diff --git a/changelog.d/+python38.removed.md b/changelog.d/+python38.removed.md
deleted file mode 100644
index 0aaffd165..000000000
--- a/changelog.d/+python38.removed.md
+++ /dev/null
@@ -1 +0,0 @@
-Dropped support for python 3.8.
\ No newline at end of file
diff --git a/changelog.d/+tqdm-closer-new-macos.fixed.md b/changelog.d/+tqdm-closer-new-macos.fixed.md
deleted file mode 100644
index 4b1f2adaf..000000000
--- a/changelog.d/+tqdm-closer-new-macos.fixed.md
+++ /dev/null
@@ -1 +0,0 @@
-Disable Tqdm semaphore leak workaround for MacOS >= 15.7.2, as apparently it is no longer an issue in newer versions.
diff --git a/changelog.d/1119.fixed.md b/changelog.d/1119.fixed.md
deleted file mode 100644
index e3eb9cfb5..000000000
--- a/changelog.d/1119.fixed.md
+++ /dev/null
@@ -1 +0,0 @@
-Fixed SystemError buffer overflow crash on Python 3.14+ caused by rst2ansi's terminal size detection bug. The CLI now gracefully handles this error and continues to function normally.
\ No newline at end of file