diff --git a/SHA256SUMS.sources b/SHA256SUMS.sources
index 1ef4fdd..adc0d74 100644
--- a/SHA256SUMS.sources
+++ b/SHA256SUMS.sources
@@ -7,7 +7,7 @@ f757158a04889b265203eecd8ca92568e2a67c3b9062fa6bff7a0a6efd2244ac  autoconf-2.55.
 e1035aa2c21fae2a934d1ab56c774ce9d22717881dab8a1a5b16d294fb793489  autoconf-2.57.tar.bz2
 f0cde70a8f135098a6a3e85869f2e1cc3f141beea766fa3d6636e086cd8b90a7  autoconf-2.59.tar.bz2
 93a2ceab963618b021db153f0c881a2de82455c1dc7422be436fcd5c554085a1  autoconf-2.61.tar.bz2
-db11944057f3faf229ff5d6ce3fcd819f565455c152b72cec17ebc1cbb80136b  autoconf-2.65.tar.bz2
+872f4cadf12e7e7c8a2414e047fdff26b517c7f1a977d72433c124d0d3acaa85  autoconf-2.64.tar.bz2
 64ebcec9f8ac5b2487125a86a7760d2591ac9e1d3dbd59489633f9de62a57684  autoconf-2.69.tar.xz
 e8a6eb9d28ddcba8ffef3fa211653239e9bf239aba6a01a6b7cfc7ceaec69cbd  autoconf-archive-2021.02.19.tar.xz
 e98ab43bb839c31696a4202e5b6ff388b391659ef2387cf9365019fad17e1adc  automake-1.10.3.tar.bz2
diff --git a/sysa.py b/sysa.py
index ff2a2a5..2dbf43a 100755
--- a/sysa.py
+++ b/sysa.py
@@ -363,8 +363,8 @@ class SysA:
         # automake 1.10.3
         self.get_file("https://mirrors.kernel.org/gnu/automake/automake-1.10.3.tar.bz2")
 
-        # autoconf 2.65
-        self.get_file("https://mirrors.kernel.org/gnu/autoconf/autoconf-2.65.tar.bz2")
+        # autoconf 2.64
+        self.get_file("https://mirrors.kernel.org/gnu/autoconf/autoconf-2.64.tar.bz2")
 
         # gcc 4.0.4
         self.get_file("https://mirrors.kernel.org/gnu/gcc/gcc-4.0.4/gcc-core-4.0.4.tar.bz2",
diff --git a/sysa/autoconf-2.65/autoconf-2.65.sh b/sysa/autoconf-2.64/autoconf-2.64.sh
similarity index 63%
rename from sysa/autoconf-2.65/autoconf-2.65.sh
rename to sysa/autoconf-2.64/autoconf-2.64.sh
index ddd2a5a..62ebfdf 100755
--- a/sysa/autoconf-2.65/autoconf-2.65.sh
+++ b/sysa/autoconf-2.64/autoconf-2.64.sh
@@ -13,7 +13,7 @@ src_prepare() {
 }
 
 src_configure() {
-    ./configure --prefix="${PREFIX}" --program-suffix=-2.65
+    ./configure --prefix="${PREFIX}" --program-suffix=-2.64
 }
 
 src_compile() {
@@ -23,8 +23,8 @@ src_compile() {
 src_install() {
     make install MAKEINFO=true DESTDIR="${DESTDIR}"
 
-    ln -sf "${PREFIX}/bin/autoconf-2.65" "${DESTDIR}${PREFIX}/bin/autoconf"
-    ln -sf "${PREFIX}/bin/autoheader-2.65" "${DESTDIR}${PREFIX}/bin/autoheader"
-    ln -sf "${PREFIX}/bin/autom4te-2.65" "${DESTDIR}${PREFIX}/bin/autom4te"
-    ln -sf "${PREFIX}/bin/autoreconf-2.65" "${DESTDIR}${PREFIX}/bin/autoreconf"
+    ln -sf "${PREFIX}/bin/autoconf-2.64" "${DESTDIR}${PREFIX}/bin/autoconf"
+    ln -sf "${PREFIX}/bin/autoheader-2.64" "${DESTDIR}${PREFIX}/bin/autoheader"
+    ln -sf "${PREFIX}/bin/autom4te-2.64" "${DESTDIR}${PREFIX}/bin/autom4te"
+    ln -sf "${PREFIX}/bin/autoreconf-2.64" "${DESTDIR}${PREFIX}/bin/autoreconf"
 }
diff --git a/sysa/autoconf-2.69/autoconf-2.69.sh b/sysa/autoconf-2.69/autoconf-2.69.sh
index 604fa4a..98449fd 100755
--- a/sysa/autoconf-2.69/autoconf-2.69.sh
+++ b/sysa/autoconf-2.69/autoconf-2.69.sh
@@ -4,7 +4,7 @@
 
 src_prepare() {
     rm doc/standards.info
-    autoreconf-2.65 -f
+    autoreconf-2.64 -f
 
     # Install autoconf data files into versioned directory
     for file in */*/Makefile.in */Makefile.in Makefile.in; do
diff --git a/sysa/bison-2.3/bison-2.3.sh b/sysa/bison-2.3/bison-2.3.sh
index 6d0c455..aacc366 100755
--- a/sysa/bison-2.3/bison-2.3.sh
+++ b/sysa/bison-2.3/bison-2.3.sh
@@ -7,7 +7,7 @@ src_prepare() {
 
     ../../import-gnulib.sh
 
-    AUTOPOINT=true autoreconf-2.65 -fi
+    AUTOPOINT=true autoreconf-2.69 -fi
 
     # Remove pregenerated files
     rm src/parse-gram.c src/parse-gram.h src/scan-skel.c src/scan-gram.c
diff --git a/sysa/run.sh b/sysa/run.sh
index bee5e29..111c925 100755
--- a/sysa/run.sh
+++ b/sysa/run.sh
@@ -139,7 +139,7 @@ build libtool-2.2.4
 
 build automake-1.10.3
 
-build autoconf-2.65
+build autoconf-2.64
 
 build gcc-4.0.4 pass1.sh checksums/pass1
 
diff --git a/sysa/xz-5.0.5/xz-5.0.5.sh b/sysa/xz-5.0.5/xz-5.0.5.sh
index 5824a6f..7f6fd22 100755
--- a/sysa/xz-5.0.5/xz-5.0.5.sh
+++ b/sysa/xz-5.0.5/xz-5.0.5.sh
@@ -5,7 +5,7 @@
 src_prepare() {
     default
 
-    autoreconf-2.65 -f
+    autoreconf-2.64 -f
 }
 
 src_configure() {