diff --git a/changes/635.fix.rst b/changes/635.fix.rst
new file mode 100644
index 0000000..ab8d09d
--- /dev/null
+++ b/changes/635.fix.rst
@@ -0,0 +1 @@
+Increased minimum version of zhmcclient to 1.18.0 to pick up fixes.
diff --git a/minimum-constraints-install.txt b/minimum-constraints-install.txt
index 11d0ae7..2a20024 100644
--- a/minimum-constraints-install.txt
+++ b/minimum-constraints-install.txt
@@ -19,11 +19,11 @@ wheel==0.41.3
 
 # Direct dependencies for install (must be consistent with requirements.txt)
 
-zhmcclient==1.17.0
+zhmcclient==1.18.0
 # TODO: Use official prometheus-client version (0.21.0 ?) once released.
 # prometheus-client==0.21.0
 urllib3==1.26.19
-jsonschema==3.2.0
+jsonschema==4.18.0
 six==1.16.0
 Jinja2==3.1.4
 ruamel.yaml==0.18.6
@@ -39,7 +39,7 @@ pyrsistent==0.20.0
 
 # All other indirect dependencies for install that are not in requirements.txt
 
-attrs==19.2.0
+attrs==22.2.0
 certifi==2024.07.04
 charset-normalizer==2.0.4
 decorator==4.0.11
diff --git a/requirements.txt b/requirements.txt
index 150fa00..f4b928e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@
 # Direct dependencies for install (must be consistent with minimum-constraints-install.txt)
 
 # zhmcclient @ git+https://github.com/zhmcclient/python-zhmcclient.git@master
-zhmcclient>=1.17.0
+zhmcclient>=1.18.0
 
 # prometheus-client 0.19.0 added support for HTTPS/mTLS
 # prometheus-client 0.20.0 improved HTTPS/mTLS support
@@ -19,7 +19,7 @@ zhmcclient>=1.17.0
 # prometheus-client>=0.21.0
 
 urllib3>=1.26.19
-jsonschema>=3.2.0
+jsonschema>=4.18.0
 Jinja2>=3.1.4
 ruamel.yaml>=0.18.6