diff --git a/.builds/msrv.yml b/.builds/msrv.yml
index 57154b32..5f118e3f 100644
--- a/.builds/msrv.yml
+++ b/.builds/msrv.yml
@@ -6,8 +6,8 @@ sources:
 tasks:
   - rustup: |
       # We specify --profile minimal because we'd otherwise download docs
-      rustup toolchain install 1.39.0 --profile minimal
-      rustup default 1.39.0
+      rustup toolchain install 1.40.0 --profile minimal
+      rustup default 1.40.0
   - test: |
       cd ruma-client-api
 
diff --git a/README.md b/README.md
index ca76cd0b..a58f0978 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ These types can be shared by client and server code.
 
 ## Minimum Rust version
 
-ruma-client-api requires Rust 1.39.0 or later.
+ruma-client-api requires Rust 1.40.0 or later.
 
 ## Contributing