diff --git a/scripts/docker/buildpack-deps/Dockerfile.emscripten b/scripts/docker/buildpack-deps/Dockerfile.emscripten
index 81f9881d3..777d8b2ec 100644
--- a/scripts/docker/buildpack-deps/Dockerfile.emscripten
+++ b/scripts/docker/buildpack-deps/Dockerfile.emscripten
@@ -33,12 +33,12 @@
 # Using $(em-config CACHE)/sysroot/usr seems to work, though, and still has cmake find the
 # dependencies automatically.
 FROM emscripten/emsdk:2.0.33 AS base
-LABEL version="10"
+LABEL version="11"
 
 ADD emscripten.jam /usr/src
 RUN set -ex; \
 	cd /usr/src; \
-	git clone https://github.com/Z3Prover/z3.git -b z3-4.8.16 --depth 1 ; \
+	git clone https://github.com/Z3Prover/z3.git -b z3-4.8.17 --depth 1 ; \
 	cd z3; \
 	mkdir build; \
 	cd build; \
diff --git a/scripts/docker/buildpack-deps/Dockerfile.ubuntu1604.clang.ossfuzz b/scripts/docker/buildpack-deps/Dockerfile.ubuntu1604.clang.ossfuzz
index d85700f33..2fe04622b 100644
--- a/scripts/docker/buildpack-deps/Dockerfile.ubuntu1604.clang.ossfuzz
+++ b/scripts/docker/buildpack-deps/Dockerfile.ubuntu1604.clang.ossfuzz
@@ -22,7 +22,7 @@
 # (c) 2016-2021 solidity contributors.
 #------------------------------------------------------------------------------
 FROM gcr.io/oss-fuzz-base/base-clang:latest as base
-LABEL version="17"
+LABEL version="18"
 
 ARG DEBIAN_FRONTEND=noninteractive
 
@@ -61,7 +61,7 @@ RUN set -ex; \
 
 # Z3
 RUN set -ex; \
-    git clone --depth 1 -b z3-4.8.16 https://github.com/Z3Prover/z3.git \
+    git clone --depth 1 -b z3-4.8.17 https://github.com/Z3Prover/z3.git \
     /usr/src/z3; \
     cd /usr/src/z3; \
     mkdir build; \
diff --git a/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004 b/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004
index 4ef94d30a..2f3304c1e 100644
--- a/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004
+++ b/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004
@@ -22,7 +22,7 @@
 # (c) 2016-2019 solidity contributors.
 #------------------------------------------------------------------------------
 FROM buildpack-deps:focal AS base
-LABEL version="12"
+LABEL version="13"
 
 ARG DEBIAN_FRONTEND=noninteractive
 
diff --git a/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004.clang b/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004.clang
index 4a0fadd25..0a11680b8 100644
--- a/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004.clang
+++ b/scripts/docker/buildpack-deps/Dockerfile.ubuntu2004.clang
@@ -22,7 +22,7 @@
 # (c) 2016-2019 solidity contributors.
 #------------------------------------------------------------------------------
 FROM buildpack-deps:focal AS base
-LABEL version="12"
+LABEL version="13"
 
 ARG DEBIAN_FRONTEND=noninteractive