diff --git a/macOS/deps/Makefile b/macOS/deps/Makefile
index 709640b03020183dc6ce1777308df80d58c119ab..5b737f4f02225a24b3b4aad5e5827bb4182e2a80 100644
--- a/macOS/deps/Makefile
+++ b/macOS/deps/Makefile
@@ -53,7 +53,7 @@ clean-all: clean-lib clean-src clean-tar
 #
 tarballs/slicot-$(SLICOT_VERSION).tar.gz:
 	mkdir -p tarballs
-	wget $(WGET_OPTIONS) -O $@ https://deb.debian.org/debian/pool/main/s/slicot/slicot_$(SLICOT_VERSION).orig.tar.xz
+	wget $(WGET_OPTIONS) -O $@ https://github.com/SLICOT/SLICOT-Reference/archive/refs/tags/v$(SLICOT_VERSION).tar.gz
 
 $(DEPS_ARCH)/sources64/slicot-$(SLICOT_VERSION): tarballs/slicot-$(SLICOT_VERSION).tar.gz
 	rm -rf $(DEPS_ARCH)/sources64/slicot-*
diff --git a/macOS/deps/versions.mk b/macOS/deps/versions.mk
index 09d2b6887ae226c9720fe87a188bb0e2b0186f38..66ea809b81468e826dc97e57348a87b89dd4058a 100644
--- a/macOS/deps/versions.mk
+++ b/macOS/deps/versions.mk
@@ -1,2 +1,2 @@
-SLICOT_VERSION = 5.9~20240205.gita037f7e
+SLICOT_VERSION = 5.9
 X13AS_VERSION = 1-1-b60
diff --git a/windows/deps/Makefile b/windows/deps/Makefile
index cfe6b7f22004c32d1348af227c8aab70d2c1124c..33287a4fdaba8a97502ed52168ba3d4cb9b28321 100644
--- a/windows/deps/Makefile
+++ b/windows/deps/Makefile
@@ -49,7 +49,7 @@ clean-all: clean-lib clean-src clean-tar
 
 tarballs/slicot-$(SLICOT_VERSION).tar.gz:
 	mkdir -p tarballs
-	wget $(WGET_OPTIONS) -O $@ https://deb.debian.org/debian/pool/main/s/slicot/slicot_$(SLICOT_VERSION).orig.tar.xz
+	wget $(WGET_OPTIONS) -O $@ https://github.com/SLICOT/SLICOT-Reference/archive/refs/tags/v$(SLICOT_VERSION).tar.gz
 
 sources64/slicot-$(SLICOT_VERSION)-with-64bit-integer: tarballs/slicot-$(SLICOT_VERSION).tar.gz
 	rm -rf sources64/slicot-*-with-64bit-integer
diff --git a/windows/deps/versions.mk b/windows/deps/versions.mk
index 8b790a04fbfc6e0b2e4f10c20e2f58abda53bea2..f665fec74652dc398cea2a5ccbf85f2e97da1bc8 100644
--- a/windows/deps/versions.mk
+++ b/windows/deps/versions.mk
@@ -1,4 +1,4 @@
-SLICOT_VERSION = 5.9~20240205.gita037f7e
+SLICOT_VERSION = 5.9
 X13AS_VERSION = 1-1-b60
 
 OCTAVE_VERSION = 8.4.0