diff --git a/actions/create_unique_testpypi_version/requirements.txt b/actions/create_unique_testpypi_version/requirements.txt
index 7bed904c..af8ee35c 100644
--- a/actions/create_unique_testpypi_version/requirements.txt
+++ b/actions/create_unique_testpypi_version/requirements.txt
@@ -1,7 +1,7 @@
 annotated-types==0.7.0
 attrs==26.1.0
 beautifulsoup4==4.15.0
-certifi==2026.5.20
+certifi==2026.6.17
 charset-normalizer==3.4.7
 idna==3.18
 mailbits==0.2.3
diff --git a/actions/update_development_dependencies/requirements.txt b/actions/update_development_dependencies/requirements.txt
index 90b9adb2..02209b9f 100644
--- a/actions/update_development_dependencies/requirements.txt
+++ b/actions/update_development_dependencies/requirements.txt
@@ -4,7 +4,7 @@ attrs==26.1.0
 beautifulsoup4==4.15.0
 build==1.5.0
 cachecontrol==0.14.4
-certifi==2026.5.20
+certifi==2026.6.17
 cffi==2.0.0 ; (platform_python_implementation != "PyPy" or sys_platform == "darwin") and (sys_platform == "linux" or sys_platform == "darwin")
 cfgv==3.5.0
 charset-normalizer==3.4.7