diff --git a/runtimes/7.4/Dockerfile b/runtimes/7.4/Dockerfile
index ef5f9ed5..2184e49a 100644
--- a/runtimes/7.4/Dockerfile
+++ b/runtimes/7.4/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:21.10
+FROM ubuntu:20.04
 
 LABEL maintainer="Taylor Otwell"
 
@@ -21,7 +21,7 @@ RUN apt-get update \
     && echo "keyserver hkp://keyserver.ubuntu.com:80" >> ~/.gnupg/dirmngr.conf \
     && gpg --recv-key 0x14aa40ec0831756756d7f66c4f4ea0aae5267a6c \
     && gpg --export 0x14aa40ec0831756756d7f66c4f4ea0aae5267a6c > /usr/share/keyrings/ppa_ondrej_php.gpg \
-    && echo "deb [signed-by=/usr/share/keyrings/ppa_ondrej_php.gpg] https://ppa.launchpadcontent.net/ondrej/php/ubuntu impish main" > /etc/apt/sources.list.d/ppa_ondrej_php.list \
+    && echo "deb [signed-by=/usr/share/keyrings/ppa_ondrej_php.gpg] https://ppa.launchpadcontent.net/ondrej/php/ubuntu focal main" > /etc/apt/sources.list.d/ppa_ondrej_php.list \
     && apt-get update \
     && apt-get install -y php7.4-cli php7.4-dev \
        php7.4-pgsql php7.4-sqlite3 php7.4-gd \
@@ -38,7 +38,7 @@ RUN apt-get update \
     && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | gpg --dearmor | tee /usr/share/keyrings/yarnkey.gpg >/dev/null \
     && echo "deb [signed-by=/usr/share/keyrings/yarnkey.gpg] https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list \
     && curl -sS https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor | tee /usr/share/keyrings/pgdg.gpg >/dev/null \
-    && echo "deb [signed-by=/usr/share/keyrings/pgdg.gpg] http://apt.postgresql.org/pub/repos/apt impish-pgdg main" > /etc/apt/sources.list.d/pgdg.list \
+    && echo "deb [signed-by=/usr/share/keyrings/pgdg.gpg] http://apt.postgresql.org/pub/repos/apt focal-pgdg main" > /etc/apt/sources.list.d/pgdg.list \
     && apt-get update \
     && apt-get install -y yarn \
     && apt-get install -y mysql-client \
diff --git a/runtimes/8.0/Dockerfile b/runtimes/8.0/Dockerfile
index 13d80427..15456ca8 100644
--- a/runtimes/8.0/Dockerfile
+++ b/runtimes/8.0/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:21.10
+FROM ubuntu:20.04
 
 LABEL maintainer="Taylor Otwell"
 
@@ -21,7 +21,7 @@ RUN apt-get update \
     && echo "keyserver hkp://keyserver.ubuntu.com:80" >> ~/.gnupg/dirmngr.conf \
     && gpg --recv-key 0x14aa40ec0831756756d7f66c4f4ea0aae5267a6c \
     && gpg --export 0x14aa40ec0831756756d7f66c4f4ea0aae5267a6c > /usr/share/keyrings/ppa_ondrej_php.gpg \
-    && echo "deb [signed-by=/usr/share/keyrings/ppa_ondrej_php.gpg] https://ppa.launchpadcontent.net/ondrej/php/ubuntu impish main" > /etc/apt/sources.list.d/ppa_ondrej_php.list \
+    && echo "deb [signed-by=/usr/share/keyrings/ppa_ondrej_php.gpg] https://ppa.launchpadcontent.net/ondrej/php/ubuntu focal main" > /etc/apt/sources.list.d/ppa_ondrej_php.list \
     && apt-get update \
     && apt-get install -y php8.0-cli php8.0-dev \
        php8.0-pgsql php8.0-sqlite3 php8.0-gd \
@@ -38,7 +38,7 @@ RUN apt-get update \
     && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | gpg --dearmor | tee /usr/share/keyrings/yarnkey.gpg >/dev/null \
     && echo "deb [signed-by=/usr/share/keyrings/yarnkey.gpg] https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list \
     && curl -sS https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor | tee /usr/share/keyrings/pgdg.gpg >/dev/null \
-    && echo "deb [signed-by=/usr/share/keyrings/pgdg.gpg] http://apt.postgresql.org/pub/repos/apt impish-pgdg main" > /etc/apt/sources.list.d/pgdg.list \
+    && echo "deb [signed-by=/usr/share/keyrings/pgdg.gpg] http://apt.postgresql.org/pub/repos/apt focal-pgdg main" > /etc/apt/sources.list.d/pgdg.list \
     && apt-get update \
     && apt-get install -y yarn \
     && apt-get install -y mysql-client \