diff --git a/pkgs/servers/sql/postgresql/default.nix b/pkgs/servers/sql/postgresql/default.nix
index 496a2c371dda..95df2b02c0bb 100644
--- a/pkgs/servers/sql/postgresql/default.nix
+++ b/pkgs/servers/sql/postgresql/default.nix
@@ -65,7 +65,6 @@ let
         ./patches/specify_pkglibdir_at_runtime.patch
         ./patches/findstring.patch
       ]
-      ++ lib.optional (atLeast "10") ./patches/stabilize-timetz-dst.patch
       ++ lib.optional stdenv.isLinux (if atLeast "13" then ./patches/socketdir-in-run-13.patch else ./patches/socketdir-in-run.patch);
 
     installTargets = [ "install-world" ];
@@ -200,9 +199,9 @@ in self: {
   };
 
   postgresql_10 = self.callPackage generic {
-    version = "10.14";
+    version = "10.15";
     psqlSchema = "10.0"; # should be 10, but changing it is invasive
-    sha256 = "0fxj30jvwq5pqpbj97vhlxgmn2ah59a78s9jyjr7vxyqj7sdh71q";
+    sha256 = "0zhzj9skag1pgqas2rnd217vj41ilaalqna17j47gyngpvhbqmjr";
     this = self.postgresql_10;
     inherit self;
   };
diff --git a/pkgs/servers/sql/postgresql/patches/stabilize-timetz-dst.patch b/pkgs/servers/sql/postgresql/patches/stabilize-timetz-dst.patch
deleted file mode 100644
index b6c633cb73eb..000000000000
--- a/pkgs/servers/sql/postgresql/patches/stabilize-timetz-dst.patch
+++ /dev/null
@@ -1,117 +0,0 @@
-From 4a071afbd056282746a5bc9362e87f579a56402d Mon Sep 17 00:00:00 2001
-From: Tom Lane <tgl@sss.pgh.pa.us>
-Date: Thu, 29 Oct 2020 15:28:14 -0400
-Subject: [PATCH 1/1] Stabilize timetz test across DST transitions.
-
-The timetz test cases I added in commit a9632830b were unintentionally
-sensitive to whether or not DST is active in the PST8PDT time zone.
-Thus, they'll start failing this coming weekend, as reported by
-Bernhard M. Wiedemann in bug #16689.  Fortunately, DST-awareness is
-not significant to the purpose of these test cases, so we can just
-force them all to PDT (DST hours) to preserve stability of the
-results.
-
-Back-patch to v10, as the prior patch was.
-
-Discussion: https://postgr.es/m/16689-57701daa23b377bf@postgresql.org
-Git viewer: https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=4a071afbd056282746a5bc9362e87f579a56402d;hp=f90149e6285aaae6b48559afce1bd638ee26c33e
----
- src/test/regress/expected/timetz.out | 32 ++++++++++++++--------------
- src/test/regress/sql/timetz.sql      | 16 +++++++-------
- 2 files changed, 24 insertions(+), 24 deletions(-)
-
-diff --git a/src/test/regress/expected/timetz.out b/src/test/regress/expected/timetz.out
-index 038bb5fa09..1ab5ed5105 100644
---- a/src/test/regress/expected/timetz.out
-+++ b/src/test/regress/expected/timetz.out
-@@ -91,45 +91,45 @@ SELECT f1 AS "Ten" FROM TIMETZ_TBL WHERE f1 >= '00:00-07';
- (12 rows)
- 
- -- Check edge cases
--SELECT '23:59:59.999999'::timetz;
-+SELECT '23:59:59.999999 PDT'::timetz;
-        timetz       
- --------------------
-  23:59:59.999999-07
- (1 row)
- 
--SELECT '23:59:59.9999999'::timetz;  -- rounds up
-+SELECT '23:59:59.9999999 PDT'::timetz;  -- rounds up
-    timetz    
- -------------
-  24:00:00-07
- (1 row)
- 
--SELECT '23:59:60'::timetz;  -- rounds up
-+SELECT '23:59:60 PDT'::timetz;  -- rounds up
-    timetz    
- -------------
-  24:00:00-07
- (1 row)
- 
--SELECT '24:00:00'::timetz;  -- allowed
-+SELECT '24:00:00 PDT'::timetz;  -- allowed
-    timetz    
- -------------
-  24:00:00-07
- (1 row)
- 
--SELECT '24:00:00.01'::timetz;  -- not allowed
--ERROR:  date/time field value out of range: "24:00:00.01"
--LINE 1: SELECT '24:00:00.01'::timetz;
-+SELECT '24:00:00.01 PDT'::timetz;  -- not allowed
-+ERROR:  date/time field value out of range: "24:00:00.01 PDT"
-+LINE 1: SELECT '24:00:00.01 PDT'::timetz;
-                ^
--SELECT '23:59:60.01'::timetz;  -- not allowed
--ERROR:  date/time field value out of range: "23:59:60.01"
--LINE 1: SELECT '23:59:60.01'::timetz;
-+SELECT '23:59:60.01 PDT'::timetz;  -- not allowed
-+ERROR:  date/time field value out of range: "23:59:60.01 PDT"
-+LINE 1: SELECT '23:59:60.01 PDT'::timetz;
-                ^
--SELECT '24:01:00'::timetz;  -- not allowed
--ERROR:  date/time field value out of range: "24:01:00"
--LINE 1: SELECT '24:01:00'::timetz;
-+SELECT '24:01:00 PDT'::timetz;  -- not allowed
-+ERROR:  date/time field value out of range: "24:01:00 PDT"
-+LINE 1: SELECT '24:01:00 PDT'::timetz;
-                ^
--SELECT '25:00:00'::timetz;  -- not allowed
--ERROR:  date/time field value out of range: "25:00:00"
--LINE 1: SELECT '25:00:00'::timetz;
-+SELECT '25:00:00 PDT'::timetz;  -- not allowed
-+ERROR:  date/time field value out of range: "25:00:00 PDT"
-+LINE 1: SELECT '25:00:00 PDT'::timetz;
-                ^
- --
- -- TIME simple math
-diff --git a/src/test/regress/sql/timetz.sql b/src/test/regress/sql/timetz.sql
-index b699e4b03c..ce763d89e8 100644
---- a/src/test/regress/sql/timetz.sql
-+++ b/src/test/regress/sql/timetz.sql
-@@ -36,14 +36,14 @@ SELECT f1 AS "None" FROM TIMETZ_TBL WHERE f1 < '00:00-07';
- SELECT f1 AS "Ten" FROM TIMETZ_TBL WHERE f1 >= '00:00-07';
- 
- -- Check edge cases
--SELECT '23:59:59.999999'::timetz;
--SELECT '23:59:59.9999999'::timetz;  -- rounds up
--SELECT '23:59:60'::timetz;  -- rounds up
--SELECT '24:00:00'::timetz;  -- allowed
--SELECT '24:00:00.01'::timetz;  -- not allowed
--SELECT '23:59:60.01'::timetz;  -- not allowed
--SELECT '24:01:00'::timetz;  -- not allowed
--SELECT '25:00:00'::timetz;  -- not allowed
-+SELECT '23:59:59.999999 PDT'::timetz;
-+SELECT '23:59:59.9999999 PDT'::timetz;  -- rounds up
-+SELECT '23:59:60 PDT'::timetz;  -- rounds up
-+SELECT '24:00:00 PDT'::timetz;  -- allowed
-+SELECT '24:00:00.01 PDT'::timetz;  -- not allowed
-+SELECT '23:59:60.01 PDT'::timetz;  -- not allowed
-+SELECT '24:01:00 PDT'::timetz;  -- not allowed
-+SELECT '25:00:00 PDT'::timetz;  -- not allowed
- 
- --
- -- TIME simple math
--- 
-2.20.1