diff --git a/glpk-4.56.tar.gz b/glpk-4.56.tar.gz
deleted file mode 100644
index 7aef83c..0000000
--- a/glpk-4.56.tar.gz
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-size 4016267
diff --git a/glpk-4.56.tar.gz.sig b/glpk-4.56.tar.gz.sig
deleted file mode 100644
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diff --git a/glpk-4.57.tar.gz b/glpk-4.57.tar.gz
new file mode 100644
index 0000000..6ff8136
--- /dev/null
+++ b/glpk-4.57.tar.gz
@@ -0,0 +1,3 @@
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+oid sha256:7323b2a7cc1f13e45fc845f0fdca74f4daea2af716f5ad2d4d55b41e8394275c
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diff --git a/glpk-4.57.tar.gz.sig b/glpk-4.57.tar.gz.sig
new file mode 100644
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diff --git a/glpk.changes b/glpk.changes
index 39cb92f..9ac7bd1 100644
--- a/glpk.changes
+++ b/glpk.changes
@@ -1,3 +1,23 @@
+-------------------------------------------------------------------
+Sun Nov  8 09:34:38 UTC 2015 - mpluskal@suse.com
+
+- Update to 4.57
+  * A new, more efficient implementation of the dual simplex method
+		was included in the package. This new implementation replaces
+		the old one, which was removed.
+	* Option sr_heur was added to struct glp_iocp to enable/disable
+		the simple rounding heuristic used by the MIP solver. Thanks to
+		Chris Matrakidis <cmatraki@gmail.com> for suggestion.
+	* New API routine glp_at_error was added and documented. Thanks
+		to Jeroen Demeyer <jdemeyer@cage.ugent.be> for suggestion.
+	* Some minor typos were corrected in the GLPK documentation.
+		Thanks to Anton Voropaev <anton.n.voropaev@gmail.com> for typo
+		report.
+	* An example application program TSPSOL was added. It uses the
+		GLPK MIP optimizer to solve the Symmetric Traveling Salesman
+		Problem and illustrates "lazy" constraints generation. For more
+		details please see glpk/examples/tsp/README.
+
 -------------------------------------------------------------------
 Fri Oct  2 12:19:02 UTC 2015 - mpluskal@suse.com
 
diff --git a/glpk.spec b/glpk.spec
index 5a687ca..e13e079 100644
--- a/glpk.spec
+++ b/glpk.spec
@@ -18,14 +18,14 @@
 
 %define lname   libglpk36
 Name:           glpk
-Version:        4.56
+Version:        4.57
 Release:        0
 Summary:        GNU Linear Programming Kit
 License:        GPL-3.0
 Group:          Productivity/Scientific/Math
-Url:            http://www.gnu.org/software/glpk/glpk.html
-Source0:        http://ftp.gnu.org/gnu/glpk/%{name}-%{version}.tar.gz
-Source1:        http://ftp.gnu.org/gnu/glpk/%{name}-%{version}.tar.gz.sig
+Url:            https://www.gnu.org/software/glpk/glpk.html
+Source0:        https://ftp.gnu.org/gnu/glpk/%{name}-%{version}.tar.gz
+Source1:        https://ftp.gnu.org/gnu/glpk/%{name}-%{version}.tar.gz.sig
 Source2:        %{name}.keyring
 BuildRequires:  ghostscript
 BuildRequires:  texlive