diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bf2e80b22..a1620a43c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.49.0
+          toolchain: 1.50.0
           override: true
       - run: rustup component add rustfmt
       - uses: actions-rs/cargo@v1
@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: 1.49.0
+            toolchain: 1.50.0
             components: clippy
             override: true
       - uses: actions-rs/clippy-check@v1
@@ -72,7 +72,7 @@ jobs:
         # macOS disabled due to random failures related to caching
         #os: [ubuntu-latest, windows-latest, macOS-latest]
         os: [ubuntu-latest, windows-latest]
-        rust: [1.49.0]
+        rust: [1.50.0]
         experimental: [false]
 #        include:
 #          - os: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e8d5d2e1..d3e9081cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -96,7 +96,7 @@
 
 - try harder on backup opening #2148
 
-- switch to rust 1.49, update toolchains, deps #2150 #2155 #2165 #2107
+- switch to rust 1.50, update toolchains, deps #2150 #2155 #2165 #2107 #2262 #2271
 
 - improve python bindings #2113 #2115 #2133 #2214
 
diff --git a/ci_scripts/docker-coredeps/deps/build_rust.sh b/ci_scripts/docker-coredeps/deps/build_rust.sh
index 0e40bb1a1..e9d285afa 100755
--- a/ci_scripts/docker-coredeps/deps/build_rust.sh
+++ b/ci_scripts/docker-coredeps/deps/build_rust.sh
@@ -3,9 +3,9 @@
 set -e -x
 
 # Install Rust
-curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.49.0-x86_64-unknown-linux-gnu -y
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.50.0-x86_64-unknown-linux-gnu -y
 export PATH=/root/.cargo/bin:$PATH
 rustc --version
 
 # remove some 300-400 MB that we don't need for automated builds
-rm -rf /root/.rustup/toolchains/1.49.0-x86_64-unknown-linux-gnu/share
+rm -rf /root/.rustup/toolchains/1.50.0-x86_64-unknown-linux-gnu/share
diff --git a/rust-toolchain b/rust-toolchain
index 7f3a46a84..5a5c7211d 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.49.0
+1.50.0
diff --git a/src/constants.rs b/src/constants.rs
index 52019567c..11d1953bd 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -32,7 +32,9 @@ impl Default for Blocked {
     }
 }
 
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(u8)]
 pub enum ShowEmails {
     Off = 0,
@@ -46,7 +48,9 @@ impl Default for ShowEmails {
     }
 }
 
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(u8)]
 pub enum MediaQuality {
     Balanced = 0,
@@ -59,7 +63,9 @@ impl Default for MediaQuality {
     }
 }
 
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(u8)]
 pub enum KeyGenType {
     Default = 0,
@@ -73,7 +79,9 @@ impl Default for KeyGenType {
     }
 }
 
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(i8)]
 pub enum VideochatType {
     Unknown = 0,
diff --git a/src/html.rs b/src/html.rs
index 4f8999801..1379f10eb 100644
--- a/src/html.rs
+++ b/src/html.rs
@@ -420,23 +420,16 @@ test some special html-characters as < > and & but also " and &#x
         let t = TestContext::new().await;
         let raw = include_bytes!("../test-data/message/apple_cid_jpg.eml");
         let test = String::from_utf8_lossy(raw);
-        assert!(test
-            .find("Content-Id: <8AE052EF-BC90-486F-BB78-58D3590308EC@fritz.box>")
-            .is_some());
-        assert!(test
-            .find("cid:8AE052EF-BC90-486F-BB78-58D3590308EC@fritz.box")
-            .is_some());
+        assert!(test.contains("Content-Id: <8AE052EF-BC90-486F-BB78-58D3590308EC@fritz.box>"));
+        assert!(test.contains("cid:8AE052EF-BC90-486F-BB78-58D3590308EC@fritz.box"));
         assert!(test.find("data:").is_none());
 
         // parsing converts cid: to data:
         let parser = HtmlMsgParser::from_bytes(&t.ctx, raw).await.unwrap();
-        assert!(parser.html.find("<html>").is_some());
-        assert!(parser.html.find("Content-Id:").is_none());
-        assert!(parser
-            .html
-            .find("data:image/jpeg;base64,/9j/4AAQ")
-            .is_some());
-        assert!(parser.html.find("cid:").is_none());
+        assert!(parser.html.contains("<html>"));
+        assert!(!parser.html.contains("Content-Id:"));
+        assert!(parser.html.contains("data:image/jpeg;base64,/9j/4AAQ"));
+        assert!(!parser.html.contains("cid:"));
     }
 
     #[async_std::test]
@@ -462,10 +455,10 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert_ne!(msg.get_from_id(), DC_CONTACT_ID_SELF);
         assert_eq!(msg.is_dc_message, MessengerMessage::No);
         assert!(!msg.is_forwarded());
-        assert!(msg.get_text().unwrap().find("this is plain").is_some());
+        assert!(msg.get_text().unwrap().contains("this is plain"));
         assert!(msg.has_html());
         let html = msg.get_id().get_html(&alice).await.unwrap();
-        assert!(html.find("this is <b>html</b>").is_some());
+        assert!(html.contains("this is <b>html</b>"));
 
         // alice: create chat with bob and forward received html-message there
         let chat = alice.create_chat_with_contact("", "bob@example.net").await;
@@ -476,10 +469,10 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert_eq!(msg.get_from_id(), DC_CONTACT_ID_SELF);
         assert_eq!(msg.is_dc_message, MessengerMessage::Yes);
         assert!(msg.is_forwarded());
-        assert!(msg.get_text().unwrap().find("this is plain").is_some());
+        assert!(msg.get_text().unwrap().contains("this is plain"));
         assert!(msg.has_html());
         let html = msg.get_id().get_html(&alice).await.unwrap();
-        assert!(html.find("this is <b>html</b>").is_some());
+        assert!(html.contains("this is <b>html</b>"));
 
         // bob: check that bob also got the html-part of the forwarded message
         let bob = TestContext::new_bob().await;
@@ -489,10 +482,10 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert_ne!(msg.get_from_id(), DC_CONTACT_ID_SELF);
         assert_eq!(msg.is_dc_message, MessengerMessage::Yes);
         assert!(msg.is_forwarded());
-        assert!(msg.get_text().unwrap().find("this is plain").is_some());
+        assert!(msg.get_text().unwrap().contains("this is plain"));
         assert!(msg.has_html());
         let html = msg.get_id().get_html(&bob).await.unwrap();
-        assert!(html.find("this is <b>html</b>").is_some());
+        assert!(html.contains("this is <b>html</b>"));
     }
 
     #[async_std::test]
@@ -529,10 +522,10 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert_eq!(msg.is_dc_message, MessengerMessage::Yes);
         assert!(msg.get_showpadlock());
         assert!(msg.is_forwarded());
-        assert!(msg.get_text().unwrap().find("this is plain").is_some());
+        assert!(msg.get_text().unwrap().contains("this is plain"));
         assert!(msg.has_html());
         let html = msg.get_id().get_html(&alice).await.unwrap();
-        assert!(html.find("this is <b>html</b>").is_some());
+        assert!(html.contains("this is <b>html</b>"));
     }
 
     #[async_std::test]
@@ -554,7 +547,7 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert!(!msg.is_forwarded());
         assert!(msg.mime_modified);
         let html = msg.get_id().get_html(&alice).await.unwrap();
-        assert!(html.find("<b>html</b> text").is_some());
+        assert!(html.contains("<b>html</b> text"));
 
         // let bob receive the message
         let chat_id = bob.create_chat(&alice).await.id;
@@ -564,6 +557,6 @@ test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x
         assert!(!msg.is_forwarded());
         assert!(msg.mime_modified);
         let html = msg.get_id().get_html(&bob).await.unwrap();
-        assert!(html.find("<b>html</b> text").is_some());
+        assert!(html.contains("<b>html</b> text"));
     }
 }
diff --git a/src/job.rs b/src/job.rs
index 86ae59f4b..3efaef58e 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -35,7 +35,9 @@ use crate::{scheduler::InterruptInfo, sql};
 const JOB_RETRIES: u32 = 17;
 
 /// Thread IDs
-#[derive(Debug, Display, Copy, Clone, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[derive(
+    Debug, Display, Copy, Clone, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(i32)]
 pub(crate) enum Thread {
     Unknown = 0,
diff --git a/src/lot.rs b/src/lot.rs
index 3a069e473..7868eea6c 100644
--- a/src/lot.rs
+++ b/src/lot.rs
@@ -22,7 +22,9 @@ pub struct Lot {
 }
 
 #[repr(u8)]
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql,
+)]
 pub enum Meaning {
     None = 0,
     Text1Draft = 1,
@@ -67,7 +69,9 @@ impl Lot {
 }
 
 #[repr(i32)]
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql,
+)]
 pub enum LotState {
     // Default
     Undefined = 0,
diff --git a/src/mimeparser.rs b/src/mimeparser.rs
index 77bf86ddb..32ae838ba 100644
--- a/src/mimeparser.rs
+++ b/src/mimeparser.rs
@@ -103,7 +103,9 @@ pub(crate) enum MailinglistType {
     None,
 }
 
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql,
+)]
 #[repr(i32)]
 pub enum SystemMessage {
     Unknown = 0,
diff --git a/src/securejoin/bobstate.rs b/src/securejoin/bobstate.rs
index e0dcc970a..49be4f53b 100644
--- a/src/securejoin/bobstate.rs
+++ b/src/securejoin/bobstate.rs
@@ -93,8 +93,10 @@ impl<'a> BobStateHandle<'a> {
         info!(context, "Handling securejoin message for BobStateHandle");
         match self.bobstate.handle_message(context, mime_message).await {
             Ok(Some(stage)) => {
-                if matches!(stage, BobHandshakeStage::Completed | BobHandshakeStage::Terminated(_))
-                {
+                if matches!(
+                    stage,
+                    BobHandshakeStage::Completed | BobHandshakeStage::Terminated(_)
+                ) {
                     self.finish_protocol(context).await;
                 }
                 Some(stage)
diff --git a/src/token.rs b/src/token.rs
index 29716c16c..af4b2df98 100644
--- a/src/token.rs
+++ b/src/token.rs
@@ -11,7 +11,9 @@ use crate::context::Context;
 use crate::dc_tools::{dc_create_id, time};
 
 /// Token namespace
-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
+#[derive(
+    Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql,
+)]
 #[repr(i32)]
 pub enum Namespace {
     Unknown = 0,