diff --git a/crates/core/src/document/mupdf_sys.rs b/crates/core/src/document/mupdf_sys.rs
index c62c52b..79eef0c 100644
--- a/crates/core/src/document/mupdf_sys.rs
+++ b/crates/core/src/document/mupdf_sys.rs
@@ -3,7 +3,7 @@
 use std::mem;
 
 pub const FZ_MAX_COLORS: usize = 32;
-pub const FZ_VERSION: &str = "1.23.6";
+pub const FZ_VERSION: &str = "1.23.11";
 
 pub const FZ_META_INFO_AUTHOR: &str = "info:Author";
 pub const FZ_META_INFO_TITLE: &str = "info:Title";
diff --git a/doc/BUILD.md b/doc/BUILD.md
index 624634b..e844e04 100644
--- a/doc/BUILD.md
+++ b/doc/BUILD.md
@@ -39,7 +39,7 @@ rustup target add arm-unknown-linux-gnueabihf
 
 ## Developer Tools
 
-Install the required dependencies: *MuPDF 1.23.6*, *DjVuLibre*, *FreeType*, *HarfBuzz*.
+Install the required dependencies: *MuPDF 1.23.11*, *DjVuLibre*, *FreeType*, *HarfBuzz*.
 
 ### Emulator
 
diff --git a/thirdparty/download.sh b/thirdparty/download.sh
index b068d21..f78f65f 100755
--- a/thirdparty/download.sh
+++ b/thirdparty/download.sh
@@ -2,20 +2,20 @@
 
 declare -A urls=(
 	# Compression
-	["zlib"]="https://www.zlib.net/zlib-1.3.tar.gz"
+	["zlib"]="https://www.zlib.net/zlib-1.3.1.tar.gz"
 	["bzip2"]="https://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz"
 	# Images
-	["libpng"]="https://download.sourceforge.net/libpng/libpng-1.6.40.tar.gz"
-	["libjpeg"]="http://www.ijg.org/files/jpegsrc.v9e.tar.gz"
-	["openjpeg"]="https://github.com/uclouvain/openjpeg/archive/v2.5.0.tar.gz"
-	["jbig2dec"]="https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs9533/jbig2dec-0.19.tar.gz"
+	["libpng"]="https://download.sourceforge.net/libpng/libpng-1.6.43.tar.gz"
+	["libjpeg"]="http://www.ijg.org/files/jpegsrc.v9f.tar.gz"
+	["openjpeg"]="https://github.com/uclouvain/openjpeg/archive/v2.5.2.tar.gz"
+	["jbig2dec"]="https://github.com/ArtifexSoftware/jbig2dec/releases/download/0.20/jbig2dec-0.20.tar.gz"
 	# Fonts
 	["freetype2"]="https://download.savannah.gnu.org/releases/freetype/freetype-2.13.2.tar.gz"
-	["harfbuzz"]="https://github.com/harfbuzz/harfbuzz/archive/3.0.0.tar.gz" # We're stuck at 3.0.0.
+	["harfbuzz"]="https://github.com/harfbuzz/harfbuzz/archive/8.4.0.tar.gz"
 	# Documents
 	["gumbo"]="https://github.com/google/gumbo-parser/archive/v0.10.1.tar.gz"
 	["djvulibre"]="http://downloads.sourceforge.net/djvu/djvulibre-3.5.28.tar.gz"
-	["mupdf"]="https://mupdf.com/downloads/archive/mupdf-1.23.6-source.tar.gz"
+	["mupdf"]="https://mupdf.com/downloads/archive/mupdf-1.23.11-source.tar.gz"
 )
 
 for name in "${@:-${!urls[@]}}" ; do