diff --git a/autorelease/update_beta.txt b/autorelease/update_beta.txt
deleted file mode 100644
index 8d1c8b69c..000000000
--- a/autorelease/update_beta.txt
+++ /dev/null
@@ -1 +0,0 @@
- 
diff --git a/docs/devel/changelog.md b/docs/devel/changelog.md
index 1b5df1231..078d0dc57 100644
--- a/docs/devel/changelog.md
+++ b/docs/devel/changelog.md
@@ -7,6 +7,11 @@
 # Changelog
 
 
+## 4.21.0b1 (2023-09-14)
+
+- Updated PDFium from `5989` to `6002`.
+
+
 ## 4.20.0 (2023-09-10)
 
 - Updated PDFium from `5975` to `5989`.
diff --git a/src/pypdfium2/version.py b/src/pypdfium2/version.py
index 377bd8ff7..9b80c2b4f 100644
--- a/src/pypdfium2/version.py
+++ b/src/pypdfium2/version.py
@@ -4,9 +4,9 @@
 __all__ = ("V_PYPDFIUM2", "V_LIBPDFIUM", "V_BUILDNAME", "V_PDFIUM_IS_V8")
 
 V_MAJOR = 4
-V_MINOR = 20
+V_MINOR = 21
 V_PATCH = 0
-V_BETA = None
+V_BETA = 1
 
 #: pypdfium2 version string
 V_PYPDFIUM2 = f"{V_MAJOR}.{V_MINOR}.{V_PATCH}"
@@ -14,7 +14,7 @@
     V_PYPDFIUM2 += f"b{V_BETA}"
 
 #: PDFium library version string (git tag or commit hash)
-V_LIBPDFIUM = "5989"
+V_LIBPDFIUM = "6002"
 
 #: String describing the included PDFium binary's origin (pdfium-binaries, source)
 V_BUILDNAME = "pdfium-binaries"