diff --git a/build/mkdocs/Dockerfile b/build/mkdocs/Dockerfile
index a389aa9c5..ebd3efc57 100644
--- a/build/mkdocs/Dockerfile
+++ b/build/mkdocs/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.8
+FROM alpine:3.9
 
 RUN apk update && apk add --no-cache \
   bash \
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 2e9ae9e56..e9d0be843 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,4 +1,4 @@
-mkdocs-material~=3.1.0
+mkdocs-material~=4.0.2
 mkdocs~=1.0.4
 pymdown-extensions~=6.0
-pygments~=2.3.0
+pygments~=2.3.1