diff --git a/.gitignore b/.gitignore
index 13f0380..d558ebc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,4 @@
 /mupdf-1.20.0-rc2-source.tar.gz
 /mupdf-1.20.0-source.tar.gz
 /mupdf-1.20.3-source.tar.gz
+/mupdf-1.21.0-rc1-source.tar.gz
diff --git a/mupdf.spec b/mupdf.spec
index bad06a6..89e4b9b 100644
--- a/mupdf.spec
+++ b/mupdf.spec
@@ -4,8 +4,8 @@
 %global jbig2dec_version 0.19
 
 Name:           mupdf
-Version:        1.20.3
-%global upversion 1.20.3
+Version:        1.21.0~rc1
+%global upversion 1.21.0-rc1
 Release:        %autorelease
 Summary:        A lightweight PDF viewer and toolkit
 License:        AGPLv3+
@@ -25,14 +25,14 @@ Requires:       jbig2dec-libs = %{jbig2dec_version}
 # We need to build against the Artifex fork of lcms2 so that we are thread safe
 # (see bug #1553915). Artifex make sure to rebase against upstream, who refuse
 # to integrate Artifex's changes. 
-Provides:       bundled(lcms2-devel) = 2.12^85.g558b336
+Provides:       bundled(lcms2-devel) = 2.14~rc1^59-g88b6a72
 # We need to build against the Artifex fork of freeglut so that we are unicode safe.
 Provides:       bundled(freeglut-devel) = 3.0.0^11.g13ae6aa
 # muPDF needs the muJS sources for the build even if we build against the system
 # version so bundling them is the safer choice.
-Provides:       bundled(mujs-devel) = 1.2.0
+Provides:       bundled(mujs-devel) = 1.3.1
 # muPDF builds only against in-tree extract which is versioned along with ghostpdl.
-Provides:       bundled(extract) = 9.56.0^4.g10c442d
+Provides:       bundled(extract) = 9.56.0^53-gc18d9f3
 
 %description
 MuPDF is a lightweight PDF viewer and toolkit written in portable C.
diff --git a/sources b/sources
index 1e7ccd2..dc31fe2 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (mupdf-1.20.3-source.tar.gz) = ed3fe09971223c500fb85558bb3f8c4a605c82fca3cd2217cdf4758e44bdfe3ef4106c95037d7a8ea536117414e5acbfa14aa736bfb7e33e591050c12c07a0ee
+SHA512 (mupdf-1.21.0-rc1-source.tar.gz) = 1a19df58272e4c4eb1bf121e49066dbb1f29e51be69369fa9dbc5f86cb31908a41490acff39051a2dad437d75b59503fc3871511211c6270e25295c13cc4db58