diff --git a/Cargo.toml b/Cargo.toml
index f8d4d80b4..e36a804b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "rayon"
 # Reminder to update html_rool_url in lib.rs when updating version
-version = "1.4.0"
+version = "1.4.1"
 authors = ["Niko Matsakis <niko@alum.mit.edu>",
            "Josh Stone <cuviper@gmail.com>"]
 description = "Simple work-stealing parallelism for Rust"
diff --git a/RELEASES.md b/RELEASES.md
index 381ed9c81..89a2e5794 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -1,3 +1,15 @@
+# Release rayon 1.4.1 (2020-09-29)
+
+- The new `flat_map_iter` and `flatten_iter` methods can be used to flatten
+  sequential iterators, which may perform better in cases that don't need the
+  nested parallelism of `flat_map` and `flatten`.
+- The new `par_drain` method is a parallel version of the standard `drain` for
+  collections, removing items while keeping the original capacity. Collections
+  that implement this through `ParallelDrainRange` support draining items from
+  arbitrary index ranges, while `ParallelDrainFull` always drains everything.
+- The new `positions` method finds all items that match the given predicate and
+  returns their indices in a new iterator.
+
 # Release rayon-core 1.8.1 (2020-09-17)
 
 - Fixed an overflow panic on high-contention workloads, for a counter that was
diff --git a/ci/compat-Cargo.lock b/ci/compat-Cargo.lock
index 52e9851fa..bb3550302 100644
--- a/ci/compat-Cargo.lock
+++ b/ci/compat-Cargo.lock
@@ -64,7 +64,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "backtrace"
-version = "0.3.50"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "addr2line 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -216,7 +216,7 @@ dependencies = [
  "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memoffset 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -235,9 +235,9 @@ name = "derivative"
 version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -351,12 +351,12 @@ name = "glium"
 version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "gl_generator 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.24.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memoffset 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "takeable-option 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -429,7 +429,7 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.15"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -437,8 +437,11 @@ dependencies = [
 
 [[package]]
 name = "instant"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "iovec"
@@ -553,7 +556,7 @@ dependencies = [
 
 [[package]]
 name = "memoffset"
-version = "0.5.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -733,7 +736,7 @@ name = "num_cpus"
 version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -752,9 +755,9 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-crate 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -841,7 +844,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.21"
+version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -860,7 +863,7 @@ name = "quote"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1014,7 +1017,7 @@ dependencies = [
 
 [[package]]
 name = "rayon"
-version = "1.4.0"
+version = "1.4.1"
 dependencies = [
  "autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1056,7 +1059,7 @@ dependencies = [
  "num 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon 1.4.0",
+ "rayon 1.4.1",
  "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.116 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1145,9 +1148,9 @@ name = "serde_derive"
 version = "1.0.116"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1199,10 +1202,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "1.0.41"
+version = "1.0.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1361,7 +1364,7 @@ dependencies = [
  "core-graphics 0.19.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-video-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "dispatch 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "instant 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "instant 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1420,7 +1423,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum approx 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f0e60b75072ecd4168020818c0107f2857bb6c4e64252d8d3983f6263b40a5c3"
 "checksum autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
 "checksum autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
-"checksum backtrace 0.3.50 (registry+https://github.com/rust-lang/crates.io-index)" = "46254cf2fdcdf1badb5934448c1bcbe046a56537b3987d96c51a7afc5d03f293"
+"checksum backtrace 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)" = "ec1931848a574faa8f7c71a12ea00453ff5effbb5f51afe7f77d7a48cace6ac1"
 "checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 "checksum block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
 "checksum byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
@@ -1463,8 +1466,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum glutin_gles2_sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e8094e708b730a7c8a1954f4f8a31880af00eb8a1c5b5bf85d28a0a3c6d69103"
 "checksum glutin_glx_sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "7e393c8fc02b807459410429150e9c4faffdb312d59b8c038566173c81991351"
 "checksum glutin_wgl_sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3da5951a1569dbab865c6f2a863efafff193a93caf05538d193e9e3816d21696"
-"checksum hermit-abi 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "3deed196b6e7f9e44a2ae8d94225d80302d81208b1bb673fd21fe634645c85a9"
-"checksum instant 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "5b141fdc7836c525d4d594027d318c84161ca17aaf8113ab1f81ab93ae897485"
+"checksum hermit-abi 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c30f6d0bc6b00693347368a67d41b58f2fb851215ff1da49e90fe2c5c667151"
+"checksum instant 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "63312a18f7ea8760cdd0a7c5aac1a619752a246b833545e3e36d1f81f7cd9e66"
 "checksum iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b2b3ea6ff95e175473f8ffe6a7eb7c00d054240321b84c57051175fe3c1e075e"
 "checksum jni-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
@@ -1481,7 +1484,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
 "checksum memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 "checksum memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
-"checksum memoffset 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c198b026e1bbf08a937e94c6c60f9ec4a2267f5b0d2eec9c1b21b061ce2be55f"
+"checksum memoffset 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "043175f069eda7b85febe4a74abbaeff828d9f8b448515d3151a14a3542811aa"
 "checksum miniz_oxide 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c60c0dfe32c10b43a144bad8fc83538c52f58302c92300ea7ec7bf7b38d5a7b9"
 "checksum mio 0.6.22 (registry+https://github.com/rust-lang/crates.io-index)" = "fce347092656428bc8eaf6201042cb551b8d67855af7374542a92a0fbfcac430"
 "checksum mio-extras 2.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "52403fe290012ce777c4626790c8951324a2b9e3316b3143779c72b029742f19"
@@ -1512,7 +1515,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ppv-lite86 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c36fa947111f5c62a733b652544dd0016a43ce89619538a8ef92724a6f501a20"
 "checksum proc-macro-crate 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "1d6ea3c4595b96363c13943497db34af4460fb474a95c43f4446ad341b8c9785"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
-"checksum proc-macro2 1.0.21 (registry+https://github.com/rust-lang/crates.io-index)" = "36e28516df94f3dd551a587da5357459d9b36d945a7c37c3557928c1c2ff2a2c"
+"checksum proc-macro2 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)" = "51ef7cd2518ead700af67bf9d1a658d90b6037d77110fd9c0445429d0ba1c6c9"
 "checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
 "checksum quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
 "checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
@@ -1549,7 +1552,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum smithay-client-toolkit 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)" = "421c8dc7acf5cb205b88160f8b4cc2c5cfabe210e43b2f80f009f4c1ef910f1d"
 "checksum stb_truetype 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f77b6b07e862c66a9f3e62a07588fee67cd90a9135a2b942409f195507b4fb51"
 "checksum strsim 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
-"checksum syn 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)" = "6690e3e9f692504b941dc6c3b188fd28df054f7fb8469ab40680df52fdcc842b"
+"checksum syn 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)" = "9c51d92969d209b54a98397e1b91c8ae82d8c87a7bb87df0b29aa2ad81454228"
 "checksum takeable-option 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "36ae8932fcfea38b7d3883ae2ab357b0d57a02caaa18ebb4f5ece08beaec4aa0"
 "checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"