diff --git a/.appveyor.yml b/.appveyor.yml
index b337024..1865bfb 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -22,7 +22,7 @@ install:
   - curl -sSf -o rustup-init.exe https://win.rustup.rs
   - rustup-init.exe -y --default-host %TARGET% --default-toolchain none --no-modify-path
   - rustup --version
-  - rustup toolchain install --profile minimal beta-%TARGET% 1.44.0-%TARGET%
+  - rustup toolchain install --profile minimal beta-%TARGET% 1.47.0-%TARGET%
   - rustup component add --toolchain beta-%TARGET% clippy
 
 build: false
@@ -34,7 +34,7 @@ before_test:
 test_script:
   - cargo +beta-%TARGET% clippy --all-targets --features "fail-on-warnings az f16 num-traits serde std"
   - cargo +beta-%TARGET% test --release --features "fail-on-warnings az f16 num-traits serde std"
-  - cargo +1.44.0-%TARGET% test --lib --features "fail-on-warnings az f16 num-traits serde std"
+  - cargo +1.47.0-%TARGET% test --lib --features "fail-on-warnings az f16 num-traits serde std"
 
 after_test:
   - bash -c "if [ -d $USERPROFILE/.cargo/registry/cache ]; then cd $USERPROFILE/.cargo/registry; for c in cache/*/*.crate; do s=src/${c#cache/}; if [ ! -e ${s/.crate/} ]; then rm -v $c; fi; done; find cache -name \*.crate | sort; fi"
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 48a9fa8..bf36a13 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,11 +28,11 @@ x86_64-gnulinux:
     paths:
     - cargo/
   script:
-  - rustup toolchain install --profile minimal beta-$TARGET 1.44.0-$TARGET
+  - rustup toolchain install --profile minimal beta-$TARGET 1.47.0-$TARGET
   - cargo +beta-$TARGET test --features "fail-on-warnings az f16 num-traits serde std"
   - cargo +beta-$TARGET test --release --features "fail-on-warnings az f16 num-traits serde std"
-  - cargo +1.44.0-$TARGET test --lib --features "fail-on-warnings az f16 num-traits serde std"
-  - cargo +1.44.0-$TARGET test --release --lib --features "fail-on-warnings az f16 num-traits serde std"
+  - cargo +1.47.0-$TARGET test --lib --features "fail-on-warnings az f16 num-traits serde std"
+  - cargo +1.47.0-$TARGET test --release --lib --features "fail-on-warnings az f16 num-traits serde std"
 
 i686-gnulinux:
   image: i386/rust:1
@@ -43,11 +43,11 @@ i686-gnulinux:
     paths:
     - cargo/
   script:
-  - rustup toolchain install --profile minimal beta-$TARGET 1.44.0-$TARGET
+  - rustup toolchain install --profile minimal beta-$TARGET 1.47.0-$TARGET
   - cargo +beta-$TARGET test --features "fail-on-warnings az f16 num-traits serde std"
   - cargo +beta-$TARGET test --release --features "fail-on-warnings az f16 num-traits serde std"
-  - cargo +1.44.0-$TARGET test --lib --features "fail-on-warnings az f16 num-traits serde std"
-  - cargo +1.44.0-$TARGET test --release --lib --features "fail-on-warnings az f16 num-traits serde std"
+  - cargo +1.47.0-$TARGET test --lib --features "fail-on-warnings az f16 num-traits serde std"
+  - cargo +1.47.0-$TARGET test --release --lib --features "fail-on-warnings az f16 num-traits serde std"
 
 x86_64-gnulinux-tidy:
   image: amd64/rust:1
diff --git a/README.md b/README.md
index c76c576..397832e 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,10 @@ The conversions supported cover the following cases.
 
 ## What’s new
 
+### Version 1.6.0 news (unreleased)
+
+  * The crate now requires rustc version 1.47.0 or later.
+
 ### Version 1.5.0 news (2020-11-05)
 
   * The [`wide_mul`][f-wm-1-5] method was added to all fixed-point
@@ -258,7 +262,7 @@ it in your crate, add it as a dependency inside [*Cargo.toml*]:
 fixed = "1.5"
 ```
 
-The *fixed* crate requires rustc version 1.44.0 or later.
+The *fixed* crate requires rustc version 1.47.0 or later.
 
 ## Optional features
 
diff --git a/RELEASES.md b/RELEASES.md
index f524311..04ac16d 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -5,6 +5,11 @@ modification, are permitted in any medium without royalty provided the
 copyright notice and this notice are preserved. This file is offered
 as-is, without any warranty. -->
 
+Version 1.6.0 (unreleased)
+==========================
+
+  * The crate now requires rustc version 1.47.0 or later.
+
 Version 1.5.0 (2020-11-05)
 ==========================
 
diff --git a/src/lib.rs b/src/lib.rs
index 220147c..46a2763 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -166,7 +166,7 @@ it in your crate, add it as a dependency inside [*Cargo.toml*]:
 fixed = "1.5"
 ```
 
-The *fixed* crate requires rustc version 1.44.0 or later.
+The *fixed* crate requires rustc version 1.47.0 or later.
 
 ## Optional features