diff --git a/5.0/Dockerfile b/5.0/Dockerfile
index 38ff482..271b500 100644
--- a/5.0/Dockerfile
+++ b/5.0/Dockerfile
@@ -8,10 +8,10 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 WORKDIR /usr/local/src
 # hadolint ignore=DL3003,SC2174
-RUN curl -fsSL "https://download.bestpractical.com/pub/rt/release/rt-5.0.5.tar.gz" -o rt.tar.gz \
-  && echo "90f845daaa436198c334b6e9cf5afb1df9f4445dcc165d0bcae35de9eb9be8ef  rt.tar.gz" | sha256sum -c \
+RUN curl -fsSL "https://download.bestpractical.com/pub/rt/release/rt-5.0.6.tar.gz" -o rt.tar.gz \
+  && echo "b556bedd2b4a356ec9f54eb673ff250ae9100347a04d11e34637e3fdd3efdddb  rt.tar.gz" | sha256sum -c \
   && tar -xzf rt.tar.gz \
-  && cd rt-5.0.5 \
+  && cd rt-5.0.6 \
   && ./configure \
     --enable-developer \
     --enable-externalauth \
diff --git a/update.sh b/update.sh
index 9399e04..d4b20dc 100755
--- a/update.sh
+++ b/update.sh
@@ -4,7 +4,7 @@ set -Eeuo pipefail
 
 declare -A versions=(
   [4.4.7]='47af1651d5df3f25b6374ff6c1da71c66202d61919d9431c17259fa3df69ae59'
-  [5.0.5]='90f845daaa436198c334b6e9cf5afb1df9f4445dcc165d0bcae35de9eb9be8ef'
+  [5.0.6]='b556bedd2b4a356ec9f54eb673ff250ae9100347a04d11e34637e3fdd3efdddb'
 )
 
 for version in "${!versions[@]}"; do