diff --git a/.github/variables/rust-versions.env b/.github/variables/rust-versions.env
index f6cf19e..7fff3c1 100644
--- a/.github/variables/rust-versions.env
+++ b/.github/variables/rust-versions.env
@@ -1 +1 @@
-target=1.88
+target=1.91
diff --git a/contract-tests/Cargo.toml b/contract-tests/Cargo.toml
index 2129007..803be90 100644
--- a/contract-tests/Cargo.toml
+++ b/contract-tests/Cargo.toml
@@ -2,7 +2,7 @@
 name = "contract-tests"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.88.0"  # MSRV
+rust-version = "1.91.0"  # MSRV
 license = "Apache-2.0"
 
 [dependencies]
diff --git a/launchdarkly-server-sdk/Cargo.toml b/launchdarkly-server-sdk/Cargo.toml
index 167873e..00b2786 100644
--- a/launchdarkly-server-sdk/Cargo.toml
+++ b/launchdarkly-server-sdk/Cargo.toml
@@ -4,7 +4,7 @@ description = "LaunchDarkly Server-Side SDK"
 version = "2.6.2"
 authors = ["LaunchDarkly"]
 edition = "2021"
-rust-version = "1.88.0"  # MSRV
+rust-version = "1.91.0"  # MSRV
 license = "Apache-2.0"
 homepage = "https://docs.launchdarkly.com/sdk/server-side/rust"
 repository = "https://github.com/launchdarkly/rust-server-sdk"