diff --git a/.github/workflows/cont_integration.yml b/.github/workflows/cont_integration.yml
index 4d60f15b9..fe643210e 100644
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -32,21 +32,23 @@ jobs:
         run: |
           cargo update -p log --precise "0.4.18"
           cargo update -p tempfile --precise "3.6.0"
-          cargo update -p rustls:0.21.7 --precise "0.21.1"
+          cargo update -p rustls:0.21.8 --precise "0.21.1"
           cargo update -p rustls:0.20.9 --precise "0.20.8"
-          cargo update -p tokio:1.33.0 --precise "1.29.1"
+          cargo update -p tokio --precise "1.29.1"
           cargo update -p tokio-util --precise "0.7.8"
-          cargo update -p flate2:1.0.27 --precise "1.0.26"
+          cargo update -p flate2 --precise "1.0.26"
           cargo update -p reqwest --precise "0.11.18"
           cargo update -p h2 --precise "0.3.20"
           cargo update -p rustls-webpki:0.100.3 --precise "0.100.1"
-          cargo update -p rustls-webpki:0.101.6 --precise "0.101.1"
-          cargo update -p zip:0.6.6 --precise "0.6.2"
+          cargo update -p rustls-webpki:0.101.7 --precise "0.101.1"
+          cargo update -p zip --precise "0.6.2"
           cargo update -p time --precise "0.3.13"
-          cargo update -p cc --precise "1.0.81"
           cargo update -p byteorder --precise "1.4.3"
           cargo update -p webpki --precise "0.22.2"
           cargo update -p jobserver --precise "0.1.26"
+          cargo update -p os_str_bytes --precise 6.5.1
+          cargo update -p sct --precise 0.7.0
+          cargo update -p cc --precise "1.0.81"
       - name: Build
         run: cargo build ${{ matrix.features }}
       - name: Test
diff --git a/README.md b/README.md
index 5e2cec6d5..80c86f282 100644
--- a/README.md
+++ b/README.md
@@ -70,15 +70,15 @@ cargo update -p log --precise "0.4.18"
 # tempfile 3.7.0 has MSRV 1.63.0+
 cargo update -p tempfile --precise "3.6.0"
 # rustls 0.21.7 has MSRV 1.60.0+
-cargo update -p rustls:0.21.7 --precise "0.21.1"
+cargo update -p rustls:0.21.8 --precise "0.21.1"
 # rustls 0.20.9 has MSRV 1.60.0+
 cargo update -p rustls:0.20.9 --precise "0.20.8"
 # tokio 1.33 has MSRV 1.63.0+
-cargo update -p tokio:1.33.0 --precise "1.29.1"
+cargo update -p tokio --precise "1.29.1"
 # tokio-util 0.7.9 doesn't build with MSRV 1.57.0
 cargo update -p tokio-util --precise "0.7.8"
 # flate2 1.0.27 has MSRV 1.63.0+
-cargo update -p flate2:1.0.27 --precise "1.0.26"
+cargo update -p flate2 --precise "1.0.26"
 # reqwest 0.11.19 has MSRV 1.63.0+
 cargo update -p reqwest --precise "0.11.18"
 # h2 0.3.21 has MSRV 1.63.0+
@@ -86,19 +86,23 @@ cargo update -p h2 --precise "0.3.20"
 # rustls-webpki 0.100.3 has MSRV 1.60.0+
 cargo update -p rustls-webpki:0.100.3 --precise "0.100.1"
 # rustls-webpki 0.101.2 has MSRV 1.60.0+
-cargo update -p rustls-webpki:0.101.6 --precise "0.101.1"
+cargo update -p rustls-webpki:0.101.7 --precise "0.101.1"
 # zip 0.6.6 has MSRV 1.59.0+
-cargo update -p zip:0.6.6 --precise "0.6.2"
+cargo update -p zip --precise "0.6.2"
 # time 0.3.14 has MSRV 1.59.0+
 cargo update -p time --precise "0.3.13"
-# cc 1.0.82 has MSRV 1.61.0+
-cargo update -p cc --precise "1.0.81"
 # byteorder 1.5.0 has MSRV 1.60.0+
 cargo update -p byteorder --precise "1.4.3"
 # webpki 0.22.4 requires `ring:0.17.2` which has MSRV 1.61.0+
 cargo update -p webpki --precise "0.22.2"
 # jobserver 0.1.27 has MSRV 1.66.0+
 cargo update -p jobserver --precise "0.1.26"
+# os_str_bytes 6.6.0 has MSRV 1.61.0+
+cargo update -p os_str_bytes --precise 6.5.1
+# sct 0.7.1 has MSRV 1.61.0+
+cargo update -p sct --precise 0.7.0
+# cc 1.0.82 has MSRV 1.61.0+
+cargo update -p cc --precise "1.0.81"
 ```
 
 ## License
diff --git a/crates/chain/Cargo.toml b/crates/chain/Cargo.toml
index 70748893a..7af7d3410 100644
--- a/crates/chain/Cargo.toml
+++ b/crates/chain/Cargo.toml
@@ -18,8 +18,8 @@ bitcoin = { version = "0.30.0", default-features = false }
 serde_crate = { package = "serde", version = "1", optional = true, features = ["derive"] }
 
 # Use hashbrown as a feature flag to have HashSet and HashMap from it.
-# note version 0.13 breaks outs MSRV.
-hashbrown = { version = "0.11", optional = true, features = ["serde"] }
+# note versions > 0.9.1 breaks ours 1.57.0 MSRV.
+hashbrown = { version = "0.9.1", optional = true, features = ["serde"] }
 miniscript = { version = "10.0.0", optional = true, default-features = false }
 
 [dev-dependencies]