diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index dc13804c63..7dbf4900ac 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -64,7 +64,10 @@ jobs:
           lfs: true
       - name: Install rust toolchain
         # The script for rustdoc build requires nightly toolchain.
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          # TODO 24-02-06: this is pinned due to tkaitchuck/aHash#200.
+          toolchain: nightly-2024-02-01
       - name: Load rust cache
         uses: astriaorg/buildjet-rust-cache@v2.5.1
       - name: Build rustdocs
diff --git a/deployments/scripts/rust-docs b/deployments/scripts/rust-docs
index 3d6c49731d..c31a56964c 100755
--- a/deployments/scripts/rust-docs
+++ b/deployments/scripts/rust-docs
@@ -17,7 +17,8 @@ export RUSTDOCFLAGS="--enable-index-page -Zunstable-options --cfg docsrs"
 # Doing this in one go is useful because the JSON file with search
 # indexes is overwritten on each cargo doc invocation.
 
-cargo +nightly doc --no-deps \
+# cargo +nightly doc --no-deps \
+cargo +nightly-2024-02-01 doc --no-deps \
   -p tendermint \
   -p tendermint-config \
   -p ibc-types \
diff --git a/docs/rustdoc/index.html b/docs/rustdoc/index.html
index e877b8c9e1..5269cf77d0 100644
--- a/docs/rustdoc/index.html
+++ b/docs/rustdoc/index.html
@@ -1,2 +1,2 @@
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