diff --git a/.github/actions/install-dependencies/action.yml b/.github/actions/install-dependencies/action.yml
index 263b332..b541a77 100644
--- a/.github/actions/install-dependencies/action.yml
+++ b/.github/actions/install-dependencies/action.yml
@@ -14,7 +14,7 @@ runs:
       run: echo "OPENTELEMETRY_CPP_VERSION=${OPENTELEMETRY_CPP_VERSION}" >> "${GITHUB_ENV}"
       env:
         # renovate: datasource=github-releases depName=open-telemetry/opentelemetry-cpp
-        OPENTELEMETRY_CPP_VERSION: v1.19.0
+        OPENTELEMETRY_CPP_VERSION: v1.21.0
 
     - name: Make /usr/local/include and /usr/local/lib writable
       shell: bash
diff --git a/Dockerfile b/Dockerfile
index 9b6c7c9..6216ba7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ ENV CC=clang-18
 WORKDIR /build
 
 # renovate: datasource=github-releases depName=open-telemetry/opentelemetry-cpp
-ENV OPENTELEMETRY_CPP_VERSION=v1.19.0
+ENV OPENTELEMETRY_CPP_VERSION=v1.21.0
 RUN \
     git clone https://github.com/open-telemetry/opentelemetry-cpp.git \
         --depth=1 -b "${OPENTELEMETRY_CPP_VERSION}" --single-branch && \