diff --git a/charms/kfp-api/tox.ini b/charms/kfp-api/tox.ini
index faa8f09c..da167271 100644
--- a/charms/kfp-api/tox.ini
+++ b/charms/kfp-api/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/charms/kfp-persistence/tox.ini b/charms/kfp-persistence/tox.ini
index 44435c21..0febc1cf 100644
--- a/charms/kfp-persistence/tox.ini
+++ b/charms/kfp-persistence/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/charms/kfp-profile-controller/tox.ini b/charms/kfp-profile-controller/tox.ini
index 44435c21..0febc1cf 100644
--- a/charms/kfp-profile-controller/tox.ini
+++ b/charms/kfp-profile-controller/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/charms/kfp-schedwf/tox.ini b/charms/kfp-schedwf/tox.ini
index 44435c21..0febc1cf 100644
--- a/charms/kfp-schedwf/tox.ini
+++ b/charms/kfp-schedwf/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/charms/kfp-ui/tox.ini b/charms/kfp-ui/tox.ini
index 44435c21..0febc1cf 100644
--- a/charms/kfp-ui/tox.ini
+++ b/charms/kfp-ui/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/charms/kfp-viewer/tox.ini b/charms/kfp-viewer/tox.ini
index 88e9cb7a..d1c301e4 100644
--- a/charms/kfp-viewer/tox.ini
+++ b/charms/kfp-viewer/tox.ini
@@ -32,9 +32,9 @@ allowlist_externals =
     pip-compile
     xargs
 commands =
-; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
-; For example, requirements-unit.in depends on requirements.txt and we must compile first
-; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
     bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
diff --git a/charms/kfp-viz/tox.ini b/charms/kfp-viz/tox.ini
index 44435c21..0febc1cf 100644
--- a/charms/kfp-viz/tox.ini
+++ b/charms/kfp-viz/tox.ini
@@ -31,9 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
diff --git a/tox.ini b/tox.ini
index ef4c983d..a3ff54ce 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,11 +31,13 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile -U --resolver=backtracking \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
-  pip-tools
+    pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
 
 [testenv:bundle-integration]