diff --git a/charms/katib-controller/tox.ini b/charms/katib-controller/tox.ini
index e219ef80..b29ccbeb 100644
--- a/charms/katib-controller/tox.ini
+++ b/charms/katib-controller/tox.ini
@@ -31,10 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  pip-compile requirements-fmt.in
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile --resolver=legacy \{\}'
+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 "$pattern" -exec bash -c "cd \$(dirname "{}") && pip-compile --resolver=backtracking \$(basename "{}")" \;; done'
 deps =
     pip-tools
 description = Update requirements files by executing pip-compile on all requirements*.in files, including those in subdirs.
@@ -68,4 +69,4 @@ commands =
     pytest -v --tb native --asyncio-mode=auto {[vars]tst_path}integration/test_charm.py --log-cli-level=INFO -s {posargs}
 deps =
     -r requirements-integration.txt
-description = Run integration tests
\ No newline at end of file
+description = Run integration tests
diff --git a/charms/katib-db-manager/tox.ini b/charms/katib-db-manager/tox.ini
index 2dfe1939..1c989b3f 100644
--- a/charms/katib-db-manager/tox.ini
+++ b/charms/katib-db-manager/tox.ini
@@ -31,10 +31,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  pip-compile requirements-fmt.in
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile --resolver=legacy \{\}'
+commands =
+    ; we must preserve the order of compilation, since each *.in file depends on some *.txt file.
+    ; For example, requirements-unit.in depends on requirements.txt and we must compile first
+    ; requirements.txt to ensure that requirements-unit.txt get the same dependency as the requirements.txt
+    bash -c 'for pattern in "requirements.in" "requirements-fmt.in" "requirements*.in"; do find . -type f -name "$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.
@@ -76,4 +77,4 @@ description = Run unit tests
 commands = pytest -v --tb native --asyncio-mode=auto {[vars]tst_path}integration --log-cli-level=INFO -s {posargs}
 deps =
     -r requirements-integration.txt
-description = Run integration tests
\ No newline at end of file
+description = Run integration tests
diff --git a/charms/katib-ui/tox.ini b/charms/katib-ui/tox.ini
index 494b1536..1744a980 100644
--- a/charms/katib-ui/tox.ini
+++ b/charms/katib-ui/tox.ini
@@ -30,10 +30,11 @@ allowlist_externals =
     find
     pip-compile
     xargs
-commands = 
-; uses 'bash -c' because piping didn't work in regular tox commands
-  pip-compile requirements-fmt.in
-  bash -c 'find . -type f -name "requirements*.in" | xargs --replace=\{\} pip-compile --resolver=legacy \{\}'
+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.
@@ -60,4 +61,4 @@ commands =
     black --check --diff {[vars]all_path}
 deps =
     -r requirements-lint.txt
-description = Check code against coding style standards
\ No newline at end of file
+description = Check code against coding style standards