diff --git a/pkgs/applications/science/math/sage/patches/sympy-1.7-update.patch b/pkgs/applications/science/math/sage/patches/sympy-1.7-update.patch
new file mode 100644
index 000000000000..1d21622a2354
--- /dev/null
+++ b/pkgs/applications/science/math/sage/patches/sympy-1.7-update.patch
@@ -0,0 +1,25 @@
+diff --git a/src/sage/interfaces/sympy.py b/src/sage/interfaces/sympy.py
+index cc35a42a9f..6e577d5d8d 100644
+--- a/src/sage/interfaces/sympy.py
++++ b/src/sage/interfaces/sympy.py
+@@ -397,7 +397,7 @@ def _sympysage_rf(self):
+         sage: from sympy import Symbol, rf
+         sage: _ = var('x, y')
+         sage: rfxy = rf(Symbol('x'), Symbol('y'))
+-        sage: assert rising_factorial(x,y)._sympy_() == rfxy.rewrite('gamma')
++        sage: assert rising_factorial(x,y)._sympy_() == rfxy.rewrite('gamma', piecewise=False)
+         sage: assert rising_factorial(x,y) == rfxy._sage_()
+     """
+     from sage.arith.all import rising_factorial
+diff --git a/src/sage/symbolic/expression.pyx b/src/sage/symbolic/expression.pyx
+index 7c18ec1efa..c2619ac42d 100644
+--- a/src/sage/symbolic/expression.pyx
++++ b/src/sage/symbolic/expression.pyx
+@@ -955,6 +955,6 @@ cdef class Expression(CommutativeRingElement):
+             sage: unicode_art(13 - I)
+             13 - ⅈ
+             sage: unicode_art(1.3 - I)
+-            1.3 - 1.0⋅ⅈ
++            1.3 - ⅈ
+             sage: unicode_art(cos(I))
+             cosh(1)
diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index 8948621a025a..b8fb41596607 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -103,6 +103,9 @@ stdenv.mkDerivation rec {
 
     # adapt sage's Image class to pillow 8.0.1 (https://trac.sagemath.org/ticket/30971)
     ./patches/pillow-update.patch
+
+    # fix test output with sympy 1.7 (https://trac.sagemath.org/ticket/30985)
+    ./patches/sympy-1.7-update.patch
   ];
 
   patches = nixPatches ++ bugfixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/python-modules/sympy/default.nix b/pkgs/development/python-modules/sympy/default.nix
index 9c3353aa2e74..c935176e0d51 100644
--- a/pkgs/development/python-modules/sympy/default.nix
+++ b/pkgs/development/python-modules/sympy/default.nix
@@ -8,11 +8,11 @@
 
 buildPythonPackage rec {
   pname = "sympy";
-  version = "1.6.2";
+  version = "1.7.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1cfadcc80506e4b793f5b088558ca1fcbeaec24cd6fc86f1fdccaa3ee1d48708";
+    sha256 = "sha256-o96SYel1Nbg7uGB7DaLH0DEmZQ+v6isniWV7Ipwkay4=";
   };
 
   checkInputs = [ glibcLocales ];